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CRDTS Dental Hygiene study materials
CRDTS Dental Hygiene study resources

CRDTS Dental Hygiene practice questions

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Question 1Periodontal diagnosis, risk, and long-term stability

Which Spaulding classification applies to a periodontal scaler, and what reprocessing does it require?

  1. Non-critical; intermediate-level disinfection
  2. Semi-critical; high-level disinfection only
  3. Critical; heat sterilization (steam autoclave, dry heat, or unsaturated chemical vapor) with packaging and biological monitoring Correct answer.
  4. Critical; cold sterilization only

Explanation

Periodontal scalers penetrate sulcular tissue and are critical instruments per the Spaulding classification. They must be heat-sterilized, packaged, and monitored periodically with biological indicators. Cold (liquid) sterilization is reserved for heat-sensitive critical or semi-critical instruments because verification is operationally limited. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 2Periodontal diagnosis, risk, and long-term stability

Which Gracey curette is designed for the distal surfaces of posterior teeth?

  1. Gracey 1/2
  2. Gracey 7/8
  3. Gracey 11/12
  4. Gracey 13/14 Correct answer.

Explanation

Gracey 13/14 is area-specific for distal surfaces of posteriors. Gracey 1/2 and 3/4 are anteriors, 5/6 anteriors and premolars, 7/8 and 9/10 buccal/lingual of posteriors, 11/12 mesial of posteriors. The 70-degree blade-to-shank angulation defines area-specific design. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 3Periodontal diagnosis, risk, and long-term stability

In an appropriate supervised dental hygiene technique comparison, when detecting subgingival calculus with an 11/12 ODU explorer, which technique gives the most reliable tactile feedback? Actual instrument and device instructions and patient-specific precautions still apply.

  1. Heavy lateral pressure with single vertical pass
  2. Light modified pen grasp, light lateral pressure (~weight of a dime), overlapping vertical and oblique exploratory strokes adapting to root anatomy Correct answer.
  3. Horizontal-only strokes parallel to the gingival margin
  4. Holding the explorer at 90 degrees to the long axis with maximum pressure

Explanation

Tactile sensitivity depends on a relaxed (light) modified pen grasp, a stable fulcrum, light lateral pressure (about the weight of a dime), and overlapping vertical and oblique strokes that adapt to root concavities, the CEJ, and developmental depressions. Heavy pressure dampens tactile feedback and traumatizes tissue. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 4Describe lesions, construct differentials, and obtain a diagnosis

Which local anesthetic combination carries elevated risk of methemoglobinemia and warrants caution in pediatric, G6PD-deficient, or congenital methemoglobinemia patients?

  1. Lidocaine
  2. Mepivacaine
  3. Prilocaine, and benzocaine topical (especially in young children) Correct answer.
  4. Bupivacaine

Explanation

Prilocaine and benzocaine are most often implicated in methemoglobinemia. FDA has warned against benzocaine topical anesthetics in children younger than 2 years and recommends caution in patients with G6PD deficiency or congenital methemoglobinemia. Methylene blue is the antidote. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 5Describe lesions, construct differentials, and obtain a diagnosis

Which oral lesion finding requires urgent biopsy and oral cancer workup?

  1. Linea alba on the buccal mucosa
  2. A 1.5 cm non-healing ulcer on the lateral border of the tongue present for 6 weeks in a 55-year-old smoker Correct answer.
  3. Fordyce granules
  4. Geographic tongue

Explanation

A non-healing oral ulcer present for more than 2 weeks, especially on the lateral tongue in a smoker, is a high-risk lesion for oral squamous cell carcinoma. Standard of care is biopsy without delay. Linea alba, Fordyce granules, and geographic tongue are benign and do not warrant biopsy. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 6Imaging justification, geometry, and responsible interpretation

In an appropriate supervised dental hygiene technique comparison, what is the working angulation of the blade face to the tooth surface for an effective scaling stroke? Actual instrument and device instructions and patient-specific precautions still apply.

  1. 0-30 degrees
  2. 45-90 degrees, typically 70-80 degrees for effective deposit removal Correct answer.
  3. Greater than 90 degrees
  4. 180 degrees

Explanation

Effective deposit removal requires a working blade-to-tooth angulation of approximately 70-80 degrees. Angles below 45 degrees burnish calculus, while angles over 90 degrees cause tissue laceration and root gouging. Correct adaptation, angulation, lateral pressure, and stroke direction are the fundamentals of clinical instrumentation. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 7Imaging justification, geometry, and responsible interpretation

Which radiographic technique provides the best image of alveolar bone level for periodontal assessment?

  1. Vertical bitewings (when bone loss is suspected) OR periapical radiographs taken with paralleling technique Correct answer.
  2. Bisecting-angle periapicals
  3. Occlusal films
  4. Panoramic alone

Explanation

Vertical bitewings show alveolar crest height accurately when horizontal bitewings cannot capture it; periapicals taken with paralleling technique are also acceptable. Bisecting-angle technique distorts vertical dimensions and is not preferred for periodontal evaluation. Panoramics underestimate subtle defects. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 8Imaging justification, geometry, and responsible interpretation

What does ALARA require when prescribing dental radiographs for a recall patient?

  1. Take full-mouth radiographs annually regardless of risk
  2. Apply 'As Low As Reasonably Achievable' principle: prescribe radiographs based on individual clinical assessment, history, caries risk, and periodontal status per FDA/ADA selection criteria, not by calendar default Correct answer.
  3. Take occlusal films before bitewings
  4. Take CBCT for every recall

Explanation

ALARA requires that radiographs be prescribed based on individual clinical findings, not calendar defaults. The 2012 FDA/ADA Selection Criteria for Dental Radiography provide age-, dentition-, and risk-based guidance. Time-based 'one set per year' default protocols violate ALARA. CBCT is reserved for specific indications because of higher radiation dose. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 9Prevent infection and prepare for physiological deterioration

Per CDC, dental unit water used for non-surgical patient treatment should meet what bacteriologic standard?

  1. <=100 CFU/mL
  2. <=500 CFU/mL (EPA drinking water standard) Correct answer.
  3. <=1,000 CFU/mL
  4. <=5,000 CFU/mL

Explanation

CDC follows the EPA regulatory standard for drinking water: <=500 CFU/mL of heterotrophic bacteria for dental unit water used in non-surgical procedures. Surgical procedures require sterile irrigant. Routine waterline treatment and periodic testing demonstrate compliance. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 10Prevent infection and prepare for physiological deterioration

How frequently should sterilizers be monitored with a biological indicator (spore test) per CDC dental guidance?

  1. Annually
  2. Monthly
  3. At least weekly (and every load containing implantable devices) Correct answer.
  4. Only when packaging gets wet

Explanation

CDC recommends biological monitoring of each sterilizer at least weekly using species-appropriate spores (Geobacillus stearothermophilus for steam; Bacillus atrophaeus for dry heat and chemical vapor). Every load containing implantable devices should include a BI. Mechanical and chemical indicators check every load but do not replace BIs. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 11Prevent infection and prepare for physiological deterioration

In an appropriate supervised dental hygiene technique comparison, which patient is most likely contraindicated for ultrasonic instrumentation without specific precautions? Actual instrument and device instructions and patient-specific precautions still apply.

  1. Patient with controlled hypertension
  2. Patient with an older non-shielded cardiac pacemaker (magnetostrictive may be relatively contraindicated; consult cardiology and follow device manufacturer guidance) Correct answer.
  3. Patient on daily multivitamin
  4. Patient with controlled type 2 diabetes

Explanation

Magnetostrictive ultrasonic devices historically posed a relative contraindication for patients with older, non-shielded cardiac pacemakers because of electromagnetic interference. Modern shielded pacemakers reduce risk, but clinicians should consult cardiology and the manufacturer. Piezoelectric units do not produce the same field. The other options are not contraindications. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 12Caries activity, mineral balance and restorative material mechanisms

Which is the correct strength of sodium fluoride in over-the-counter toothpaste typically marketed in the US?

  1. 1,000-1,500 ppm fluoride (OTC standard) Correct answer.
  2. 5,000 ppm fluoride (Rx only)
  3. 22,600 ppm fluoride (professional varnish)
  4. 300 ppm fluoride

Explanation

OTC fluoride toothpaste in the US typically contains 1,000-1,500 ppm fluoride (commonly 1,100 ppm NaF or stannous fluoride). 5,000 ppm prescription toothpaste is reserved for high-caries-risk adults. 22,600 ppm is professional 5% NaF varnish applied 3-6 monthly. 300 ppm is below caries-protective levels. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 13CRDTS clinical preparation, patient welfare and licensure distinction

In the 2026 CRDTS simulated-patient scoring overview, the oral-assessment and clinical skills components are reported as one total out of how many possible points?

  1. 50
  2. 75
  3. 100 Correct answer.
  4. 200

Explanation

CRDTS reports one comprehensive total score for the Dental Hygiene Examination, drawn from a maximum of 100 points. Points are deducted from the 100 for each scorable item confirmed as an error by at least two of three independent examiners. The current 2026 CRDTS materials distinguish examination format and state-board licensure authority. Use the actual current manual and receiving board for an application; the practice-bank count is not the official exam format.

Question 14CRDTS clinical preparation, patient welfare and licensure distinction

Which suggested score does the 2026 CRDTS manual describe to state boards as potentially representing acceptable performance, while the state board retains responsibility for its licensing requirements?

  1. 60
  2. 70
  3. 75 Correct answer.
  4. 85

Explanation

CRDTS communicates that a score of 75 (out of 100) may represent acceptable demonstration of competence; each state board sets its own licensure standard. The criterion-based grading system relies on three examiners with two needed to confirm each scored error. The current 2026 CRDTS materials distinguish examination format and state-board licensure authority. Use the actual current manual and receiving board for an application; the practice-bank count is not the official exam format.

Question 15CRDTS clinical preparation, patient welfare and licensure distinction

The 2026 CRDTS Dental Hygiene Examination is available in which two formats?

  1. Patient-based and live-surgery
  2. Simulated Patient (typodont/manikin) and Patient-Based (live) Correct answer.
  3. Computer-only and oral viva
  4. Group OSCE and team simulation

Explanation

Per the 2026 CRDTS Dental Hygiene structure, two formats are offered: Simulated Patient (typodont/manikin) and Patient-Based (live). Both include extra/intra oral assessment, scaling/subgingival calculus removal, periodontal probing, and calculus detection or supragingival removal per the specific manual. Candidates should verify state acceptance of the simulated format because not all boards accept manikin-only results. The current 2026 CRDTS materials distinguish examination format and state-board licensure authority. Use the actual current manual and receiving board for an application; the practice-bank count is not the official exam format.

Question 16Periodontal diagnosis, risk, and long-term stability

In an appropriate supervised dental hygiene technique comparison, which ultrasonic instrumentation principle minimizes tissue trauma and aerosol while removing calculus? Actual instrument and device instructions and patient-specific precautions still apply.

  1. Use the lateral side of the tip with light pressure, continuous motion, adequate water spray, and adapt parallel to the tooth long axis Correct answer.
  2. Use the pointed tip end-on with heavy pressure
  3. No water spray for better visibility
  4. Stationary application until deposit dissolves

Explanation

Ultrasonic technique: adapt the lateral surfaces of the tip parallel to the tooth long axis, use light pressure, maintain continuous motion to avoid heat buildup, and use adequate water lavage to cool the tip and aid debris removal. End-on application gouges root surface; insufficient water causes thermal injury and aerosol increases. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 17Periodontal diagnosis, risk, and long-term stability

Which area-specific Gracey curette is designed for mesial surfaces of posterior teeth?

  1. Gracey 1/2
  2. Gracey 7/8
  3. Gracey 11/12 Correct answer.
  4. Gracey 13/14

Explanation

Gracey 11/12 is area-specific for mesial surfaces of posteriors. Gracey 13/14 is distal of posteriors, 7/8 and 9/10 buccal/lingual of posteriors, 1/2 and 3/4 anteriors. Recognizing area-specific Graceys is foundational to selecting the proper instrument for the assigned quadrant. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 18Periodontal diagnosis, risk, and long-term stability

Which classification of probing-depth and CAL pattern is consistent with periodontal health (per 2017 World Workshop)?

  1. PDs 1-3 mm with bleeding on probing at <10% of sites and no CAL attributable to periodontitis Correct answer.
  2. PDs 4-5 mm with generalized BoP
  3. Generalized PDs >=6 mm
  4. Recession >3 mm with CAL >5 mm

Explanation

Periodontal health is consistent with probing depths <=3 mm, no clinical attachment loss attributable to periodontitis, and minimal bleeding on probing (<10% of sites). Bleeding on probing at >=10% of sites with intact attachment is gingivitis. Established periodontitis requires interdental CAL at >=2 non-adjacent teeth. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 19Periodontal diagnosis, risk, and long-term stability

What does Hamp/Glickman class II furcation involvement indicate?

  1. No furcation involvement
  2. Horizontal probe penetration into furcation but not through-and-through Correct answer.
  3. Through-and-through probe passage
  4. Suprabony pocket without furcation entry

Explanation

Hamp class II (Glickman class II) furcation involvement is horizontal probe penetration into the furcation without through-and-through passage. Class I is incipient (probe enters less than 3 mm). Class III is through-and-through. Glickman class IV is through-and-through with clinically visible furcation due to gingival recession. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 20Periodontal diagnosis, risk, and long-term stability

Per AAP 2017 grading, which factor escalates a patient from Grade B (moderate progression) toward Grade C (rapid progression)?

  1. Daily flossing
  2. Diabetes with HbA1c >=7.0% or smoking >=10 cigarettes/day Correct answer.
  3. Use of an electric toothbrush
  4. Regular 6-month recall

Explanation

Grade is initially set by direct evidence (radiographic bone loss over 5 years) or indirect evidence (% bone loss/age). Grade can then be escalated by risk factors: HbA1c >=7.0% (diabetes), smoking >=10 cigarettes/day move grade toward C (rapid progression). These risk modifiers reflect biological mechanisms of disease worsening. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 21Periodontal diagnosis, risk, and long-term stability

Which periodontal assessment recording is most appropriate for documenting probing depth?

  1. Single measurement per tooth at the mid-buccal only
  2. Six sites per tooth (DB, B, MB, ML, L, DL) recorded at the deepest reading per site Correct answer.
  3. Average of all sites in the quadrant
  4. Visual estimation without probing

Explanation

Periodontal charting standard records probing depth at six sites per tooth: distobuccal, buccal, mesiobuccal, mesiolingual, lingual, distolingual. The deepest reading per site is recorded. This provides a complete inventory of pocketing for diagnosis, treatment planning, and treatment monitoring. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 22Periodontal diagnosis, risk, and long-term stability

Which is the strongest evidence-based home-care recommendation to reduce interproximal plaque in a periodontally healthy adult?

  1. Manual toothbrush only
  2. Twice-daily brushing PLUS interdental cleaning (floss, interdental brushes appropriate to embrasure size, or water flosser) tailored to the patient Correct answer.
  3. Mouthwash alone
  4. Whitening toothpaste only

Explanation

Brushing alone reaches the facial, lingual, and occlusal surfaces but not the interproximal areas, which account for ~40% of tooth surface. Interdental cleaning (floss, interdental brushes for larger embrasures, oral irrigation for some patients) is essential. Choice of aid is patient-specific based on embrasure size, manual dexterity, and adherence. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 23Periodontal diagnosis, risk, and long-term stability

Which is the most reliable indicator of inflammation when charting periodontal health?

  1. Color of the gingiva only
  2. Bleeding on probing (BoP) site count and pattern Correct answer.
  3. Patient self-report
  4. Color of dental plaque

Explanation

BoP is the most clinically validated indicator of active inflammation; absence of BoP has a high negative predictive value for disease stability. Color, contour, and texture changes support diagnosis but BoP is the operational metric. Plaque color does not indicate inflammation. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 24Periodontal diagnosis, risk, and long-term stability

Per AAP 2017, the case definition of 'periodontitis' requires which finding?

  1. Plaque alone
  2. Interdental CAL detectable at >=2 non-adjacent teeth, OR buccal/lingual CAL >=3 mm with pocketing >3 mm at >=2 teeth, not attributable to non-periodontal causes Correct answer.
  3. Probing depth alone of any value
  4. Bleeding on probing alone

Explanation

The 2017 World Workshop defines a periodontitis case as interdental CAL detectable at >=2 non-adjacent teeth, or buccal/lingual CAL >=3 mm with pocketing >3 mm at >=2 teeth, attributable to periodontitis rather than other causes (trauma, malposition, caries). The case is then staged and graded. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 25Periodontal diagnosis, risk, and long-term stability

Which population has a documented higher risk of periodontitis progression and therefore warrants closer recall intervals?

  1. Non-smokers with HbA1c 5.0
  2. Smokers >=10 cigarettes/day and patients with uncontrolled diabetes (HbA1c >=7%) Correct answer.
  3. Adults who floss daily
  4. Patients on prescription fluoride toothpaste

Explanation

Smoking and uncontrolled diabetes are the strongest modifiable risk factors for periodontitis progression. AAP 2017 escalates grade in these patients. Shorter recall intervals (often 3-4 months) and integrated medical-dental management improve outcomes. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 26Periodontal diagnosis, risk, and long-term stability

Which is the recommended approach for documenting tobacco use during a hygiene assessment?

  1. Skip if patient looks uncomfortable
  2. Use the 5 As (Ask, Advise, Assess, Assist, Arrange) or a brief tobacco-cessation intervention; document type, frequency, pack-years, and willingness to quit Correct answer.
  3. Document only if patient volunteers
  4. Record as 'social smoker' without further detail

Explanation

The 5 As framework (Ask, Advise, Assess, Assist, Arrange) is the evidence-based clinical intervention for tobacco use. Documentation should include type (cigarettes, smokeless, vaping), frequency, pack-years (cigarettes only), and readiness to quit. Tobacco is a Grade-C risk factor for periodontitis progression. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 27Periodontal diagnosis, risk, and long-term stability

In an appropriate supervised dental hygiene technique comparison, which is the most reliable method to verify that subgingival calculus has been removed? Actual instrument and device instructions and patient-specific precautions still apply.

  1. Subjective examiner satisfaction
  2. Re-explore with a fine-tip explorer (e.g., 11/12 ODU) using light pressure and overlapping strokes to detect residual deposits Correct answer.
  3. Visual inspection only
  4. Patient self-report

Explanation

Re-exploration with a fine-tip explorer (11/12 ODU) using light pressure and overlapping strokes is the standard verification method. Residual deposits typically feel like roughness, catch the explorer tip, or transmit subtle clicks. Visual inspection alone cannot detect subgingival deposits. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 28Periodontal diagnosis, risk, and long-term stability

In an appropriate supervised dental hygiene technique comparison, which fulcrum is preferred for stability during subgingival instrumentation in the mandibular right posterior quadrant? Actual instrument and device instructions and patient-specific precautions still apply.

  1. No fulcrum
  2. Conventional intraoral fulcrum on the occlusal of adjacent teeth, or a finger-on-finger/extraoral fulcrum when needed for access and force control Correct answer.
  3. Patient's nose
  4. Operator's own forehead

Explanation

An intraoral fulcrum on adjacent occlusal surfaces provides the closest and most stable rest. When access requires alternative fulcrums, finger-on-finger, opposite-arch, or extraoral palm-on-cheek fulcrums maintain control and reduce muscle strain. No fulcrum compromises control and increases trauma risk. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 29Periodontal diagnosis, risk, and long-term stability

What is the recommended approach for a patient with a history of medication-related osteonecrosis of the jaw (MRONJ) presenting for hygiene maintenance?

  1. Proceed with aggressive scaling and root planing
  2. Use atraumatic technique with minimal soft-tissue trauma, defer elective surgical procedures, consult the prescribing oncologist if invasive treatment is needed, and provide enhanced home-care instruction Correct answer.
  3. Extract all questionable teeth immediately
  4. Skip oral hygiene assessment

Explanation

MRONJ-risk patients require atraumatic hygiene technique with minimal soft-tissue trauma. Elective surgical procedures should be deferred when feasible. For necessary invasive procedures, coordinate with the prescribing oncologist regarding drug holidays (limited evidence) and risk discussion. Enhanced home care reduces local bacterial load. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 30Periodontal diagnosis, risk, and long-term stability

Which oral hygiene index is commonly used to communicate plaque control progress to patients?

  1. DMFT only
  2. Plaque scores such as O'Leary plaque index or PHP (Patient Hygiene Performance) calculated as percent of plaque-positive surfaces Correct answer.
  3. MET score
  4. FEV1/FVC

Explanation

Plaque indices like O'Leary (percent of plaque-positive surfaces from disclosing) and PHP communicate progress to patients and guide behavioral coaching. DMFT measures caries experience, MET is exercise intensity, and FEV1/FVC is pulmonary function. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 31Periodontal diagnosis, risk, and long-term stability

What is the principal cause of gouging on the root surface during scaling?

  1. Light pressure with correct angulation
  2. Excessive lateral pressure, incorrect angulation (e.g., toe-down or pointed end), and inappropriate instrument selection Correct answer.
  3. Use of a periodontal probe
  4. Proper fulcrum

Explanation

Root surface gouging occurs from excessive lateral pressure, incorrect blade angulation (toe-down or pointed end), and instrument selection mismatch (e.g., universal curette on a tight posterior mesial). Proper instrument choice, light controlled lateral pressure, fulcrum stability, and correct angulation minimize gouging. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 32Periodontal diagnosis, risk, and long-term stability

When the gingival margin lies apical to the CEJ, how is attachment loss related to recession and probing depth, recognizing that a coronal margin requires the corresponding subtraction rather than the same formula?

  1. They are synonymous
  2. CAL = recession + probing depth, measured from a fixed landmark (CEJ); recession alone does not capture pocketing, and probing depth alone does not capture attachment changes Correct answer.
  3. Recession is always greater than CAL
  4. Recession means no inflammation

Explanation

With an apical gingival margin, the distance from CEJ to pocket base is recession plus probing depth. If the margin is coronal to the CEJ, subtract the coronal distance from probing depth instead. The reference landmark and sign convention are essential; recession alone is not the complete attachment measurement.

Question 33Periodontal diagnosis, risk, and long-term stability

Per CRDTS guidance, which is the correct approach for a patient who has dental anxiety severe enough to interfere with cooperation?

  1. Force the patient to continue regardless
  2. Use behavior management techniques (tell-show-do, breaks, communication, slow introduction), consider local anesthesia and N2O when clinically appropriate and within scope; document inability to complete if cooperation cannot be achieved Correct answer.
  3. Restrain the patient
  4. Use general anesthesia in the operatory

Explanation

Severe dental anxiety is managed with behavior management (tell-show-do, breaks, communication, slow introduction), local anesthesia for pain control, and nitrous oxide where clinically appropriate and within scope. Restraint is inappropriate. GA is not delivered in routine operatory by hygienists. Document inability to complete if cooperation fails. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 34Periodontal diagnosis, risk, and long-term stability

Which listed standardized baseline-to-review comparison best assesses possible clinical attachment change, without treating one approximate millimeter boundary as certain true progression in every measurement setting?

  1. Single recording at the deepest site
  2. Compare baseline and re-evaluation CAL (recession + PD) at the same six sites per tooth measured with calibrated probe and standardized technique; clinically meaningful change is typically >=2 mm at a site Correct answer.
  3. Patient subjective report
  4. Saliva pH change

Explanation

Compare attachment level at corresponding sites using consistent landmark, probe and technique, together with inflammation and relevant longitudinal information. Small differences can reflect measurement variability. A typical numerical reference is not a universal proof of biological progression or a substitute for the complete reassessment.

Question 35Prevent infection and prepare for physiological deterioration

Which is the immediate first action after a percutaneous needlestick from a patient of unknown serology in a dental hygiene setting?

  1. Apply bleach to the wound
  2. Wash the wound with soap and water and immediately report to occupational health for source-patient testing and risk assessment Correct answer.
  3. Begin HIV PEP before any testing
  4. Discharge the patient before reporting

Explanation

Immediate first aid is to wash the wound with soap and water (flush mucous membranes with water/saline). Then report immediately so source-patient testing and clinician risk assessment can begin within hours; HIV PEP decisions are made after risk assessment based on source serology and exposure severity, ideally within 1-2 hours. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 36Prevent infection and prepare for physiological deterioration

Which is most accurate regarding regulated medical waste container labeling per OSHA?

  1. Plain biohazard tag without symbol
  2. Universal biohazard symbol with appropriate color (fluorescent orange/orange-red) and legible 'Biohazard' label Correct answer.
  3. Recyclable sticker
  4. Sharps-only label for all biohazard waste

Explanation

OSHA 29 CFR 1910.1030 requires regulated waste containers to be color-coded (fluorescent orange/orange-red) or labeled with the universal biohazard symbol and the word 'Biohazard.' Sharps containers additionally must be puncture-resistant, leak-proof, and closable. Improper labeling is a frequent OSHA citation. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 37Prevent infection and prepare for physiological deterioration

What is the appropriate emergency action for a patient experiencing a hypoglycemic episode (sweating, tremor, confusion) during the appointment?

  1. Continue treatment and give nothing
  2. If conscious and able to swallow, administer ~15 g rapid-acting carbohydrate (e.g., glucose tablets, juice); recheck blood glucose in 15 minutes (rule of 15); if unconscious, do not give anything by mouth, give glucagon IM if available, call 911 Correct answer.
  3. Have the patient walk to the kitchen
  4. Give insulin immediately

Explanation

Hypoglycemia management uses the 'rule of 15': 15 g rapid-acting carbohydrate, recheck glucose in 15 minutes, repeat if still low. Unconscious patients should not receive oral intake (aspiration risk); IM glucagon is given, 911 activated. Insulin would worsen hypoglycemia. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 38Prevent infection and prepare for physiological deterioration

Per CRDTS infection control, what is the standard interval for hand-hygiene during a patient encounter?

  1. Only once at the start of the day
  2. Before donning gloves, after removing gloves, and any time hands become contaminated or before contact with a clean surface that is to remain clean Correct answer.
  3. Only at end of day
  4. Only when visibly soiled

Explanation

Hand hygiene is performed before donning gloves and after removing them, as well as any time hands are contaminated and before contact with a clean surface that is to remain clean. ABHR is preferred when hands are not visibly soiled; soap-and-water when soiled or after C. difficile/norovirus exposure. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 39Prevent infection and prepare for physiological deterioration

Which OSHA Hazard Communication requirement applies to chemical sterilants/disinfectants stored in the dental hygiene operatory?

  1. No labeling needed for diluted disinfectants
  2. Maintain Safety Data Sheets (SDS), label primary and secondary containers per GHS, train staff on chemical hazards, and provide PPE per SDS Correct answer.
  3. Store all chemicals at the front desk
  4. Only annual safety training required

Explanation

OSHA Hazard Communication (HazCom 2012, GHS-aligned) requires SDSs accessible to staff, GHS-compliant labels on primary and secondary containers, staff training on chemicals in use, and PPE per SDS. Secondary containers (e.g., spray bottles of diluted disinfectant) must still be labeled with product identifier and hazards. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 40Prevent infection and prepare for physiological deterioration

Which OSAP recommendation is correct for monitoring water-line treatment efficacy?

  1. No monitoring needed
  2. Periodic in-office testing of dental unit water against the CDC <=500 CFU/mL standard with documentation, plus immediate corrective action and re-test if results exceed threshold Correct answer.
  3. Annual third-party audit only
  4. Single test at install

Explanation

OSAP and CDC recommend periodic in-office testing (often quarterly or per device manufacturer) against the <=500 CFU/mL standard. Documentation is maintained, and exceedances trigger immediate re-shock/treatment and re-testing. Single tests at install or annual third-party-only audits are insufficient. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 41Prevent infection and prepare for physiological deterioration

Which is the appropriate disinfectant level for an operatory surface contaminated with visible blood between patients?

  1. Low-level disinfectant
  2. EPA-registered hospital disinfectant with tuberculocidal claim (intermediate-level) used per label contact time after cleaning the visible blood Correct answer.
  3. Water rinse only
  4. 70% ethanol wipe only

Explanation

Surfaces contaminated with visible blood require cleaning first, then disinfection with an EPA-registered hospital disinfectant with a tuberculocidal claim (intermediate-level) used per label contact time. Low-level disinfectants and 70% ethanol are inadequate for blood contamination. Water rinse does not disinfect. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 42Prevent infection and prepare for physiological deterioration

Per CDC, what should occur when a patient's medical history reveals active tuberculosis?

  1. Treat in the regular operatory with surgical mask only
  2. Defer elective dental treatment until the patient is determined non-infectious; if urgent care needed, follow Transmission-Based Precautions (airborne) with appropriate respiratory protection (N95+), negative-pressure room, and coordination with the patient's TB care provider Correct answer.
  3. Treat immediately with no precautions
  4. Treat with surgical mask only

Explanation

Active pulmonary TB requires deferral of elective dental treatment until the patient is non-infectious. For urgent care, Transmission-Based airborne precautions apply: N95 or higher respiratory protection (fit-tested), negative-pressure room when feasible, and coordination with the patient's TB care provider. Surgical masks alone are inadequate. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 43Prevent infection and prepare for physiological deterioration

Which is the recommended approach for a patient with a current latex allergy presenting to the operatory?

  1. Use latex gloves anyway
  2. Maintain a latex-free environment (non-latex gloves, dam, prophy cups, rubber stops); schedule early in the day; document allergy in chart; have epinephrine available Correct answer.
  3. Use latex gloves and antihistamine
  4. Treat under general anesthesia

Explanation

Latex-allergic patients should be treated in a latex-free environment: non-latex gloves (nitrile/neoprene), non-latex dam, prophy cups, rubber stops, and equipment. Scheduling early in the day reduces ambient airborne latex exposure. Documentation is essential. Severe latex allergy can be anaphylactic; epinephrine should be available. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 44CRDTS clinical preparation, patient welfare and licensure distinction

Under the 2026 CRDTS simulated-patient manual, what time is assigned to its written oral-assessment OSCE section, without treating this as the duration of every clinical component?

  1. 5 minutes
  2. 10 minutes
  3. 15 minutes Correct answer.
  4. 45 minutes

Explanation

Candidates have 15 minutes to complete the written Extra/Intra Oral Assessment OSCE section. The clinical calculus detection, scaling, and subgingival components are allotted 2 hours. Total scoring combines both portions into a comprehensive total. The current 2026 CRDTS materials distinguish examination format and state-board licensure authority. Use the actual current manual and receiving board for an application; the practice-bank count is not the official exam format.

Question 45CRDTS clinical preparation, patient welfare and licensure distinction

How many states accept CRDTS Dental Hygiene examination results for initial licensure?

  1. About 5
  2. About 15
  3. Over 40 (CRDTS publishes 'over 40 state boards nationwide') Correct answer.
  4. All 50 plus territories

Explanation

CRDTS publishes that over 40 state boards nationwide recognize CRDTS Dental Hygiene examination results for initial licensure. California and Hawaii accept the CRDTS Dental Hygiene exam but not the CRDTS Dental Examination. Candidates must verify acceptance with the specific licensing state. The current 2026 CRDTS materials distinguish examination format and state-board licensure authority. Use the actual current manual and receiving board for an application; the practice-bank count is not the official exam format.

Question 46CRDTS clinical preparation, patient welfare and licensure distinction

Per CRDTS Dental Hygiene patient selection criteria, the assigned quadrant must contain what kind of deposits?

  1. Stain only
  2. Supragingival plaque only
  3. Qualifying subgingival calculus meeting the published minimum quantity and distribution criteria, per the candidate manual Correct answer.
  4. No deposits at all

Explanation

CRDTS specifies a minimum quantity and distribution of subgingival calculus that must be present in the assigned quadrant for the patient to qualify. Failure to qualify the patient causes forfeiture of the procedure attempt. Stain or supragingival-only patients do not meet the subgingival calculus criterion. The current 2026 CRDTS materials distinguish examination format and state-board licensure authority. Use the actual current manual and receiving board for an application; the practice-bank count is not the official exam format.

Question 47CRDTS clinical preparation, patient welfare and licensure distinction

Which dental hygiene scope-of-practice item varies most by US state and must be verified before licensure planning?

  1. Brushing instruction
  2. Local anesthesia administration scope (which injections are within hygienist scope, with or without dentist supervision, and additional certification requirements) Correct answer.
  3. Use of a hand mirror
  4. Distribution of patient education brochures

Explanation

State scope rules vary widely for local anesthesia administration by dental hygienists; some allow full infiltration and block injections, others restrict to specific injections, and many require completion of a board-approved LA course and additional CRDTS Local Anesthesia certification. Restorative function, nitrous administration, and prescription rights also vary. Brushing instruction and patient education are universal. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.

Question 48CRDTS clinical preparation, patient welfare and licensure distinction

Per CRDTS Dental Hygiene patient screening responsibility, who is responsible for verifying that the patient meets acceptability criteria before treatment begins?

  1. The floor examiner alone
  2. The candidate must verify acceptability criteria (calculus quantity/distribution, medical screening, consent) before treatment begins; floor examiners verify and grade but do not relieve the candidate Correct answer.
  3. The dental school dean
  4. The patient

Explanation

The candidate owns patient screening: confirming acceptability criteria (calculus quantity/distribution per quadrant), completing medical screening, obtaining consent, and submitting documentation. Floor examiners verify and grade but do not assume candidate responsibility. Failure to qualify the patient forfeits the attempt. The current 2026 CRDTS materials distinguish examination format and state-board licensure authority. Use the actual current manual and receiving board for an application; the practice-bank count is not the official exam format.

Question 49CRDTS clinical preparation, patient welfare and licensure distinction

Which is true about CRDTS Dental Hygiene examiner calibration and grading reliability?

  1. Single-examiner grading is used
  2. Three independent calibrated examiners grade; an error must be confirmed by at least two examiners to be scored, improving inter-rater reliability Correct answer.
  3. The candidate grades themselves
  4. Patients grade the candidate

Explanation

CRDTS uses three calibrated examiners per procedure; an error must be confirmed by at least two of the three to be scored. The structure is designed to improve inter-rater reliability and reduce single-examiner bias. Calibration sessions standardize criterion interpretation across the examiner pool. The current 2026 CRDTS materials distinguish examination format and state-board licensure authority. Use the actual current manual and receiving board for an application; the practice-bank count is not the official exam format.

Question 50CRDTS clinical preparation, patient welfare and licensure distinction

Which OSCE-style finding most strongly suggests a need for oral cancer biopsy referral?

  1. Geographic tongue
  2. A 1.0 cm erythroplakic patch on the floor of the mouth that does not wipe off and has been present for 3 weeks in a 60-year-old current smoker Correct answer.
  3. Linea alba
  4. Fissured tongue

Explanation

Erythroplakia (red velvety patch) carries the highest malignant transformation risk among the potentially malignant disorders, especially on the floor of mouth and ventral tongue in a smoker. Persistence for >2-3 weeks warrants biopsy. Geographic tongue, linea alba, and fissured tongue are benign. Interpret the finding within the actual clinical and product context. Dental-hygiene authority, patient suitability and follow-up follow the relevant licensed team and jurisdiction; a practice answer is not a universal treatment or prescribing instruction.