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CRDTS Dental practice questions

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Question 1Dental clinical competency (patient-based and simulated patient/manikin assessment)

During a periodontal probing assessment, the probe tip is inserted with the long axis of the probe kept parallel to the long axis of the tooth root. What is the main reason for maintaining this angulation?

  1. To measure the width of attached gingiva from the mucogingival junction
  2. To allow the tip to follow the gingival sulcus and reach the base of the pocket without excessive pressure Correct answer.
  3. To detect furcation involvement on multirooted teeth
  4. To assess the mobility of the tooth in a buccolingual direction

Explanation

Probing depth reflects the distance from the gingival margin to the base of the sulcus or pocket. Keeping the probe parallel to the root long axis lets the tip follow the sulcus to its base, so the reading is accurate and trauma is minimized. Incorrect angulation underestimates or overestimates depth and can injure the junctional epithelium.

Question 2Dental clinical competency (patient-based and simulated patient/manikin assessment)

A patient reports a sharp, brief pain lasting a few seconds when cold water touches a specific upper molar, with no spontaneous pain and no pain on biting. Which pulpal diagnosis is most consistent with these findings?

  1. Necrotic pulp
  2. Reversible pulpitis Correct answer.
  3. Acute apical abscess
  4. Symptomatic irreversible pulpitis

Explanation

Reversible pulpitis produces sharp, transient pain provoked by thermal stimuli that resolves quickly once the stimulus is removed, and there is no spontaneous pain. Irreversible pulpitis typically shows lingering pain and spontaneous episodes. The absence of biting pain and swelling argues against periapical pathology.

Question 3Dental clinical competency (patient-based and simulated patient/manikin assessment)

Which instrument is most appropriate for removing a large carious lesion and shaping a cavity in a posterior tooth during a restorative procedure on a manikin?

  1. Orthodontic bracket-removing plier
  2. Periodontal curette
  3. High-speed handpiece with a tungsten carbide bur Correct answer.
  4. Ultrasonic scaler tip

Explanation

A high-speed handpiece with a carbide bur provides the cutting efficiency needed for caries removal and cavity preparation in enamel and dentin. Slow-speed or hand instruments are used for finishing and polishing rather than bulk cutting. The other listed instruments serve periodontal, scaling, or orthodontic functions.

Question 4Dental clinical competency (patient-based and simulated patient/manikin assessment)

When taking a bitewing radiograph on a manikin, the central ray should be directed through the interproximal contact areas. What is the primary purpose of this angulation?

  1. To visualize the entire root apex and surrounding bone
  2. To measure the thickness of the alveolar crest
  3. To image the temporomandibular joint space
  4. To avoid overlap of proximal surfaces of adjacent teeth Correct answer.

Explanation

Bitewing radiographs are used to detect interproximal caries and crestal bone levels. Correct horizontal angulation through the contacts prevents overlap of proximal surfaces, which would obscure early carious lesions. Periapical views, not bitewings, are used to visualize root apices.

Question 5Dental clinical competency (patient-based and simulated patient/manikin assessment)

A patient with a history of infective endocarditis is scheduled for a dental extraction. According to standard antibiotic prophylaxis guidance, which regimen is commonly recommended for a patient with no penicillin allergy?

  1. Clindamycin 600 mg orally one hour before the procedure
  2. Amoxicillin 2 g orally one hour before the procedure Correct answer.
  3. No prophylaxis is required for any patient
  4. Amoxicillin 500 mg orally for seven days starting after the procedure

Explanation

Current guidance recommends a single oral dose of amoxicillin 2 g taken 30 to 60 minutes before the procedure for adults without penicillin allergy. A single pre-procedural dose achieves adequate serum levels at the time of bacteremia. Prolonged courses and clindamycin as a first-line agent are not recommended.

Question 6Dental clinical competency (patient-based and simulated patient/manikin assessment)

During a simulated patient assessment, a patient with poorly controlled diabetes presents with generalized gingival inflammation. Which explanation best accounts for this finding?

  1. Insulin therapy itself causes gingival recession
  2. Diabetes reduces salivary flow, which directly causes gingival hyperplasia
  3. Hyperglycemia impairs neutrophil function and collagen metabolism, worsening periodontal inflammation Correct answer.
  4. Diabetes prevents the formation of dental plaque

Explanation

Poor glycemic control impairs polymorphonuclear leukocyte function, reduces collagen synthesis, and promotes advanced glycation end products that amplify inflammatory responses. This explains the increased severity of gingival inflammation in uncontrolled diabetes. The relationship is bidirectional, with periodontal infection also affecting glycemic control.

Question 7Dental clinical competency (patient-based and simulated patient/manikin assessment)

When placing a rubber dam for endodontic treatment on a manikin, which step is essential before punching the hole for the tooth?

  1. Applying etchant to the tooth
  2. Marking the tooth position on the dam and isolating adjacent teeth Correct answer.
  3. Placing a matrix band around the tooth
  4. Administering a local anesthetic block

Explanation

Accurate hole placement requires marking the tooth position on the dam and confirming that adjacent teeth are also isolated to prevent leakage. The dam must cover the operative field with adequate isolation. Etchant, anesthesia, and matrix bands are unrelated to rubber dam hole placement.

Question 8Dental clinical competency (patient-based and simulated patient/manikin assessment)

A patient presents with a fractured anterior tooth involving enamel and dentin but no pulp exposure. Which initial restorative approach is most appropriate?

  1. Root canal treatment followed by a post and core
  2. Direct composite restoration after isolation and adhesive bonding Correct answer.
  3. Immediate full-coverage crown preparation
  4. Extraction and implant placement

Explanation

An uncomplicated crown fracture involving enamel and dentin without pulp exposure is typically restored with adhesive composite after isolation. This preserves tooth structure and restores esthetics and function. Endodontic treatment or extraction is reserved for pulp exposure or non-restorable fractures.

Question 9Dental clinical competency (patient-based and simulated patient/manikin assessment)

During a periodontal examination, a probing depth of 5 mm with bleeding on probing is recorded on the mesial aspect of a molar, and the gingival margin is located 2 mm coronal to the cementoenamel junction. What is the clinical attachment level?

  1. 5 mm
  2. 2 mm
  3. 3 mm
  4. 7 mm Correct answer.

Explanation

Clinical attachment level equals probing depth plus the distance from the cementoenamel junction to the gingival margin when the margin is coronal to the CEJ. Here 5 mm plus 2 mm gives 7 mm of attachment loss. This calculation distinguishes attachment loss from pseudopocketing caused by gingival enlargement.

Question 10Dental clinical competency (patient-based and simulated patient/manikin assessment)

A patient requires a mandibular impression for a complete denture. Which technique best captures the functional width of the denture-bearing tissues?

  1. A single alginate impression with a stock tray
  2. Border molding with modeling compound followed by a wash impression in a custom tray Correct answer.
  3. A bite registration in occlusal rim material only
  4. An intraoral scan without border molding

Explanation

Border molding records the functional limits of the vestibule and sulci, and a custom tray allows a controlled wash of impression material for an accurate tissue surface. This combination captures the denture-bearing area and border seal. A stock tray alginate impression is adequate only for preliminary study casts.

Question 11Dental clinical competency (patient-based and simulated patient/manikin assessment)

During administration of an inferior alveolar nerve block, the patient suddenly reports a sharp electric shock sensation radiating to the lip and tongue. What is the most appropriate immediate action?

  1. Continue injecting at the same site
  2. Increase the injection pressure to overcome resistance
  3. Switch to a larger gauge needle and reinsert deeper
  4. Withdraw the needle slightly and aspirate before continuing Correct answer.

Explanation

A sharp electric sensation indicates the needle tip is in direct contact with the nerve. Withdrawing slightly and aspirating confirms the tip is no longer intraneural and not in a vessel before continuing. Injecting under pressure into a nerve risks paresthesia.

Question 12Dental clinical competency (patient-based and simulated patient/manikin assessment)

A 9-year-old patient in the mixed dentition presents with a newly erupted permanent first molar that has deep pits and fissures. Which preventive measure is most appropriate?

  1. Pit and fissure sealant on the caries-free occlusal surface Correct answer.
  2. Class I amalgam preparation
  3. Extraction of the tooth to prevent caries
  4. Topical fluoride varnish only, with no sealant

Explanation

Pit and fissure sealants are indicated for deep, caries-free fissures in newly erupted permanent molars to prevent occlusal caries. The mixed dentition stage is a common time for sealant placement. Restorative or surgical intervention is inappropriate for a sound tooth.

Question 13Dental clinical competency (patient-based and simulated patient/manikin assessment)

When assessing a patient's periodontal risk, which combination of findings most strongly suggests active periodontitis rather than gingivitis?

  1. Generalized gingival redness with pseudopocketing only
  2. Radiographic bone loss with clinical attachment loss and probing depths of 5 mm or more Correct answer.
  3. Bleeding on probing with 2 mm probing depths and no attachment loss
  4. Plaque accumulation with no bleeding

Explanation

Periodontitis is defined by loss of clinical attachment and alveolar bone, which distinguishes it from gingivitis. Probing depths of 5 mm or more with radiographic bone loss support this diagnosis. Gingivitis shows bleeding and pseudopockets without attachment loss.

Question 14Dental clinical competency (patient-based and simulated patient/manikin assessment)

A patient reports clicking and pain in the temporomandibular joint on opening. Which initial conservative management is most appropriate?

  1. Extraction of all third molars
  2. Soft diet, jaw rest, and a stabilization splint Correct answer.
  3. Immediate open joint surgery
  4. Long-term antibiotic therapy

Explanation

Initial management of temporomandibular disorders is conservative, including soft diet, jaw rest, physical therapy, and occlusal splint therapy. Reversible and minimally invasive measures are preferred before considering surgery. Antibiotics and unrelated extractions are not indicated.

Question 15Dental clinical competency (patient-based and simulated patient/manikin assessment)

During a crown preparation on a manikin, the margin is placed subgingivally. Which factor is most important to control to maintain gingival health?

  1. The fit and finish of the margin, avoiding overcontouring Correct answer.
  2. The shade of the opposing tooth
  3. The color of the impression material
  4. The number of articulating paper marks on the incisal edge

Explanation

Subgingival margins require excellent fit and a smooth, well-adapted contour to minimize plaque retention and gingival inflammation. Overcontouring or poor marginal adaptation promotes periodontal disease. Shade and occlusal marking are unrelated to gingival health at the margin.

Question 16Dental clinical competency (patient-based and simulated patient/manikin assessment)

A patient with severe dental anxiety requires a restorative appointment. Which behavioral management approach is most appropriate initially?

  1. Postponing all treatment indefinitely
  2. General anesthesia for all appointments
  3. Physical restraint without explanation
  4. Tell-show-do with reassurance and a signal for the patient to stop Correct answer.

Explanation

Tell-show-do is a well-established behavioral technique that reduces anxiety by explaining and demonstrating procedures before performing them. Giving the patient a stop signal restores a sense of control. General anesthesia and restraint are reserved for specific situations and are not first-line.

Question 17Dental clinical competency (patient-based and simulated patient/manikin assessment)

A patient presents with a deep carious lesion and a history of spontaneous nocturnal pain. Which diagnostic test result would most strongly support a diagnosis of irreversible pulpitis?

  1. Normal response to percussion with no tenderness
  2. A brief response to cold that resolves immediately
  3. A prolonged response to cold testing that lingers after stimulus removal Correct answer.
  4. No response to cold or electric pulp testing

Explanation

Lingering pain after thermal stimulation is a hallmark of irreversible pulpitis, reflecting inflammatory changes that do not resolve when the stimulus is removed. A brief, resolving response suggests reversible pulpitis. No response suggests pulp necrosis.

Question 18Dental clinical competency (patient-based and simulated patient/manikin assessment)

When preparing a Class II cavity on a primary molar for a stainless steel crown, which principle is most important to ensure retention and seal?

  1. Using no cement to allow future removal
  2. Placing the crown margin supragingivally on the distal only
  3. Achieving adequate occlusal reduction and a featheredge margin Correct answer.
  4. Removing only minimal caries and leaving undermined enamel

Explanation

Stainless steel crowns require adequate occlusal reduction to fit over the tooth and a featheredge margin for adaptation and seal. Proper contour and cementation ensure retention. Leaving undermined enamel or omitting cement compromises the restoration.

Question 19Dental clinical competency (patient-based and simulated patient/manikin assessment)

A patient reports that a mandibular complete denture dislodges during speech and chewing. Examination shows adequate border extension but a flat, non-retentive denture base. Which factor most likely contributes to the dislodgment?

  1. Excessive occlusal vertical dimension with balanced occlusion
  2. Inadequate border seal and lack of denture base adaptation
  3. Poor retention from loss of border seal and lack of intimate tissue contact Correct answer.
  4. Insufficient polishing of the denture flange

Explanation

Denture retention depends on an intimate tissue contact, a border seal, and adequate denture base adaptation. A flat, non-retentive base with poor adaptation reduces the physical forces that hold the denture in place. Border extension alone does not ensure retention.

Question 20Dental clinical competency (patient-based and simulated patient/manikin assessment)

During a simulated patient assessment, a patient with chronic kidney disease is being considered for periodontal treatment. Which consideration is most relevant before prescribing a nonsteroidal anti-inflammatory drug?

  1. NSAIDs improve renal function in chronic kidney disease
  2. NSAIDs are contraindicated only in children
  3. NSAIDs may reduce renal blood flow and worsen kidney function Correct answer.
  4. NSAIDs are safe at any dose in renal impairment

Explanation

NSAIDs inhibit prostaglandin synthesis, which can reduce renal blood flow and glomerular filtration, particularly in patients with chronic kidney disease. Alternative analgesics and coordination with the patient's physician are appropriate. The other statements misrepresent renal pharmacology.

Question 21Dental clinical competency (patient-based and simulated patient/manikin assessment)

A patient presents with a suspected odontogenic infection causing facial swelling and difficulty swallowing. Which initial step is most critical?

  1. Prescription of antibiotics and discharge home
  2. Assessment of the airway and prompt referral for urgent management Correct answer.
  3. Immediate extraction of the offending tooth without airway assessment
  4. Reassurance that swelling will resolve spontaneously

Explanation

Facial swelling with difficulty swallowing raises concern for airway compromise and spread to fascial spaces, which is a medical emergency. Airway assessment and urgent referral take priority. Antibiotics alone or immediate extraction without airway evaluation may delay life-saving care.

Question 22Dental clinical competency (patient-based and simulated patient/manikin assessment)

A patient with a history of bisphosphonate therapy for osteoporosis requires a dental extraction. Which precaution is most appropriate?

  1. Perform multiple extractions at once to reduce visits
  2. Prescribe antibiotics instead of addressing the source of infection
  3. Assess the risk of medication-related osteonecrosis and consider conservative management Correct answer.
  4. Proceed with extraction without any assessment of medication history

Explanation

Bisphosphonate therapy is associated with medication-related osteonecrosis of the jaw, especially after invasive procedures. Risk assessment, conservative management, and coordination with the prescribing physician are appropriate. Multiple simultaneous extractions may increase risk.

Question 23Dental clinical competency (patient-based and simulated patient/manikin assessment)

A patient in the mixed dentition has a buccally displaced maxillary canine with insufficient arch space. Which diagnostic step is most important before deciding on interceptive treatment?

  1. Taking only a photograph of the smile
  2. Radiographic localization of the canine and space analysis Correct answer.
  3. Immediate extraction of the canine
  4. Placement of a fixed retainer

Explanation

Management of an ectopic canine depends on its position, angulation, and available arch space, which require radiographic localization and space analysis. Extraction or retention decisions follow from these findings. Photographs alone are insufficient for treatment planning.

Question 24Dental clinical competency (patient-based and simulated patient/manikin assessment)

During a simulated patient assessment, a patient with Down syndrome is scheduled for a dental procedure. Which consideration is most relevant to airway management?

  1. They have a larger airway diameter, reducing risk
  2. They never require airway precautions
  3. They have an increased risk of dental caries only
  4. They may have relative macroglossia and hypotonia, increasing airway obstruction risk Correct answer.

Explanation

Individuals with Down syndrome may have relative macroglossia, midface hypoplasia, and hypotonia, which increase the risk of airway obstruction during sedation or anesthesia. Careful airway assessment and appropriate positioning are important. The other statements misrepresent the airway risk.

Question 25Dental clinical competency (patient-based and simulated patient/manikin assessment)

A patient reports a burning sensation on the tongue and a dry mouth, and examination shows erythematous candidiasis. Which underlying factor is most likely to be contributing?

  1. Drinking fluoridated water
  2. Use of inhaled corticosteroids without rinsing Correct answer.
  3. Regular use of a soft toothbrush
  4. Chewing sugar-free gum

Explanation

Inhaled corticosteroids can suppress local immunity and alter oral flora, predisposing to candidiasis, especially if the mouth is not rinsed after use. Rinsing and spacer use reduce this risk. The other habits are not associated with candidiasis.

Question 26Dental clinical competency (patient-based and simulated patient/manikin assessment)

During a simulated patient assessment, a patient on warfarin for atrial fibrillation requires a simple extraction. The most recent INR is 3.8. Which action is most appropriate before proceeding?

  1. Give a single dose of aspirin preoperatively to stabilise the clot
  2. Proceed immediately because simple extractions never cause significant bleeding
  3. Double the usual local anaesthetic dose to improve haemostasis
  4. Defer the extraction and liaise with the physician regarding INR management Correct answer.

Explanation

An INR of 3.8 exceeds the range (generally up to about 3.5) within which routine simple extractions are usually considered safe, so the procedure should be deferred and the prescribing physician consulted. Local measures alone cannot reliably compensate for a markedly elevated INR, and aspirin would further impair clotting.

Question 27Dental clinical competency (patient-based and simulated patient/manikin assessment)

On a manikin, you are asked to demonstrate correct angulation of the dental syringe for an inferior alveolar nerve block. Which orientation of the barrel relative to the occlusal plane is standard?

  1. Angled 45 degrees downward from the occlusal plane
  2. Parallel to the occlusal plane Correct answer.
  3. Perpendicular to the occlusal plane
  4. Angled 45 degrees upward from the occlusal plane

Explanation

For an inferior alveolar nerve block the syringe barrel is held roughly parallel to the occlusal plane of the mandibular molars on the same side, with the needle directed toward the mandibular foramen. This orientation keeps the needle path aligned with the medial ramus anatomy.

Question 28Dental clinical competency (patient-based and simulated patient/manikin assessment)

A patient in a simulated assessment reports a metallic taste and tingling of the lips during an inferior alveolar injection, with no pain. What is the most likely explanation?

  1. Needle contact with the lingual nerve
  2. Normal expected sensation from a successful block
  3. Intravascular deposition of local anaesthetic into a vessel Correct answer.
  4. Injection into the masseter muscle

Explanation

Metallic taste and perioral tingling during injection suggest the needle tip has entered a blood vessel and anaesthetic is entering the circulation, so the injection should be stopped and aspiration repeated. These are not typical sensations of an uncomplicated block.

Question 29Dental clinical competency (patient-based and simulated patient/manikin assessment)

During a simulated patient assessment, a patient with a history of angina reports chest tightness during a restorative appointment. Which initial step is most appropriate?

  1. Place the patient supine and proceed with the restoration
  2. Continue treatment and reassure the patient that the discomfort will pass
  3. Stop treatment, allow the patient to rest, and administer prescribed sublingual nitroglycerin Correct answer.
  4. Administer a further dose of local anaesthetic with adrenaline

Explanation

Chest tightness in a patient with angina should halt treatment; the patient should rest and take their own prescribed sublingual nitroglycerin while vital signs are monitored. If pain persists after a few minutes, emergency services should be activated.

Question 30Dental clinical competency (patient-based and simulated patient/manikin assessment)

A patient presents with a localized periodontal abscess on a molar with a 7 mm pocket and a vital pulp. Which initial treatment is most appropriate?

  1. Incision and drainage with subgingival debridement of the affected site Correct answer.
  2. Root canal treatment of the tooth
  3. Immediate extraction of the tooth
  4. Systemic antibiotics alone without local treatment

Explanation

A periodontal abscess in a vital tooth is managed by establishing drainage and debriding the pocket to remove the bacterial reservoir and calculus. Antibiotics are adjunctive and extraction or endodontic treatment is unnecessary when the pulp is vital.

Question 31Dental clinical competency (patient-based and simulated patient/manikin assessment)

During a crown preparation on a manikin, which feature of the preparation primarily provides resistance form against occlusal forces?

  1. Adequate occlusocervical height of the axial walls Correct answer.
  2. A knife-edge finish line
  3. A minimal occlusal reduction of 0.3 mm
  4. A highly polished intaglio surface

Explanation

Resistance form depends largely on sufficient axial wall height and near-parallel walls so the restoration is not dislodged by oblique or lateral forces. Finish line design and surface polish affect adaptation and retention but not resistance to tipping forces.

Question 32Dental clinical competency (patient-based and simulated patient/manikin assessment)

A patient in the mixed dentition has an ectopic permanent maxillary first molar locked under the distal bulge of the primary second molar. Which management is most appropriate?

  1. Apply a stainless steel crown to the primary molar
  2. Place a separating elastic or brass wire to disengage and guide the molar Correct answer.
  3. Extract the permanent first molar immediately
  4. Observe without intervention until the age of 12

Explanation

An ectopic first molar can often be guided into position by creating space with a separating elastic or brass wire, allowing it to slip past the distal contour of the primary molar. Extraction of the permanent tooth is a last resort and observation risks worsening the impaction.

Question 33Dental clinical competency (patient-based and simulated patient/manikin assessment)

During a simulated patient assessment, a patient with a history of infective endocarditis requiring prophylaxis is scheduled for a scaling procedure. Which regimen is a recognised standard for a non-allergic adult?

  1. A 5-day course of amoxicillin starting the day before the procedure
  2. A single 500 mg dose of amoxicillin immediately after the procedure
  3. A single 2 g dose of amoxicillin orally 30 to 60 minutes before the procedure Correct answer.
  4. A single 1 g dose of amoxicillin 24 hours before the procedure

Explanation

Current guidance recommends a single 2 g oral dose of amoxicillin 30 to 60 minutes before the procedure for adults who are not allergic. Prolonged courses or post-procedure dosing are not the recommended prophylactic approach.

Question 34Dental clinical competency (patient-based and simulated patient/manikin assessment)

A patient reports that a maxillary complete denture drops during speech. Examination shows the border seal is adequate and the occlusion is balanced. Which factor should be evaluated next?

  1. The vertical dimension of the natural teeth
  2. The patient's dietary preferences
  3. The colour match of the denture teeth
  4. Post dam adaptation and the posterior palatal seal Correct answer.

Explanation

When border seal and occlusion are satisfactory, loss of retention during speech often reflects inadequate posterior palatal seal or post dam adaptation, allowing air to enter beneath the denture. Evaluating and correcting the post dam is the logical next step.

Question 35Dental clinical competency (patient-based and simulated patient/manikin assessment)

During a simulated patient assessment, a patient with poorly controlled epilepsy reports a history of seizures in the dental chair. Which environmental modification is most appropriate for the appointment?

  1. Restrict the appointment to standing treatment
  2. Use a bright strobe light to monitor pupil responses
  3. Use a semi-supine chair position and keep the area free of sharp instruments during recovery Correct answer.
  4. Place the patient fully supine for the entire appointment

Explanation

A semi-supine position reduces aspiration risk and facilitates airway management if a seizure occurs, and clearing sharp items protects the patient during convulsions. Strobe lighting is a known trigger and should be avoided.

Question 36Dental clinical competency (patient-based and simulated patient/manikin assessment)

A patient presents with a necrotic pulp and a periapical radiolucency on a mandibular molar. Which finding would most strongly indicate that endodontic treatment is preferable to extraction?

  1. The tooth has adequate remaining coronal structure and bone support Correct answer.
  2. The patient has uncontrolled diabetes with a spreading cellulitis
  3. The tooth is mobile grade III with furcation involvement
  4. The tooth is a terminal molar with no opposing tooth

Explanation

Restorable coronal structure and adequate periodontal support are key predictors of a favourable endodontic prognosis. Severe mobility, uncontrolled systemic infection, or lack of function argue against retention.

Question 37Dental clinical competency (patient-based and simulated patient/manikin assessment)

During a simulated patient assessment, a patient with chronic obstructive pulmonary disease uses a steroid inhaler and reports oral discomfort. Examination shows erythematous areas on the palate. Which preventive advice is most appropriate?

  1. Use a mouthwash containing alcohol after each use
  2. Rinse the mouth with water after each inhaler use Correct answer.
  3. Increase the frequency of inhaler use
  4. Discontinue the inhaler without medical advice

Explanation

Inhaled corticosteroids deposit on the oral mucosa and can predispose to candidiasis, so rinsing with water after each use reduces local exposure. Alcohol-containing rinses may further irritate tissue and are not the preferred preventive measure.

Question 38Dental clinical competency (patient-based and simulated patient/manikin assessment)

On a manikin, you are preparing a Class III cavity on a maxillary central incisor. Which principle best preserves the remaining labial enamel?

  1. Remove all labial enamel to the dentinoenamel junction
  2. Extend the facial margin into the gingival sulcus
  3. Place the facial margin in enamel and bevel it where indicated Correct answer.
  4. Prepare a butt joint at the facial margin with no bevel

Explanation

For a Class III lesion, keeping the facial margin in enamel and beveling it where appropriate improves marginal seal and preserves labial enamel. Extending into the sulcus or removing enamel unnecessarily weakens the tooth.

Question 39Dental clinical competency (patient-based and simulated patient/manikin assessment)

A patient in a simulated assessment has a deep overbite and reports wear on the palatal surfaces of the maxillary incisors. Which occlusal scheme is most appropriate for a removable partial denture replacing posterior teeth?

  1. A scheme with heavy non-working side contacts to protect the anterior teeth
  2. An anterior-only contact scheme
  3. A scheme with no occlusal contacts on the artificial teeth
  4. Harmonious contacts in centric relation with balanced working and non-working excursions Correct answer.

Explanation

A removable partial denture should have harmonious centric contacts and balanced working and non-working excursions to distribute forces and protect remaining teeth and supporting tissues. Heavy non-working contacts or absent contacts create damaging forces.

Question 40Dental clinical competency (patient-based and simulated patient/manikin assessment)

During a simulated patient assessment, a patient reports a persistent dry mouth and multiple new carious lesions at the gingival margins. Which intervention is most appropriate?

  1. Prescribe a high-fluoride toothpaste and recommend frequent sips of water and sugar-free chewing gum Correct answer.
  2. Recommend a carbohydrate-rich diet to stimulate saliva
  3. Advise reducing fluoride exposure to prevent fluorosis
  4. Discontinue all preventive agents until symptoms resolve

Explanation

Xerostomia with root caries requires fluoride supplementation, hydration, and salivary stimulation such as sugar-free gum. These measures reduce demineralisation and support remineralisation.

Question 41Dental clinical competency (patient-based and simulated patient/manikin assessment)

A patient presents with a suspected temporomandibular joint dislocation after a prolonged dental appointment with the mouth wide open. Which finding best supports this diagnosis?

  1. A clicking sound on opening with full closure possible
  2. Bilateral tenderness of the temporalis muscles
  3. Pain on palpation of the masseter with normal closure
  4. Inability to close the mouth with the mandible fixed in an open position Correct answer.

Explanation

Inability to close the mouth with the mandible locked open is the hallmark of acute dislocation, in which the condyle lies anterior to the articular eminence. Clicking with full closure and muscle tenderness suggest muscular or disc displacement disorders instead.

Question 42Dental clinical competency (patient-based and simulated patient/manikin assessment)

During a simulated patient assessment, a patient with a history of rheumatic fever and a prosthetic heart valve requires periodontal surgery. Which consideration is most important?

  1. Withhold all local anaesthetic
  2. Delay prophylaxis until after the procedure
  3. Ensure appropriate antibiotic prophylaxis is given before the procedure Correct answer.
  4. Perform the procedure without any anaesthesia

Explanation

Patients with prosthetic heart valves are at high risk for infective endocarditis, so appropriate antibiotic prophylaxis must be given before procedures that cause bacteraemia. Prophylaxis after the procedure is too late to protect against the initial bacteraemia.

Question 43Dental clinical competency (patient-based and simulated patient/manikin assessment)

A patient in a simulated assessment has a mandibular Kennedy Class I arch with missing posterior teeth bilaterally. Which design feature is most important for the denture base?

  1. Minimal tissue coverage to reduce plaque accumulation
  2. A metal base only on the anterior region
  3. A base that avoids the retromolar pad
  4. Maximum tissue coverage with a broad, well-adapted base Correct answer.

Explanation

In a Kennedy Class I situation the distal extension bases rely on tissue support, so maximal well-adapted coverage distributes forces and improves stability. Avoiding the retromolar pad or minimising coverage reduces support.

Question 44Dental clinical competency (patient-based and simulated patient/manikin assessment)

During a simulated patient assessment, a patient reports a sharp pain lasting seconds after a cold stimulus is removed from a molar with no caries or restoration. Which diagnosis is most likely?

  1. Normal pulp
  2. Irreversible pulpitis
  3. Periapical abscess
  4. Reversible pulpitis Correct answer.

Explanation

Sharp pain that resolves promptly after removal of a cold stimulus, in a tooth without caries or restoration, is characteristic of reversible pulpitis. Pain that lingers indicates irreversible pulpitis, and a periapical abscess would produce spontaneous or percussion pain.

Question 45Dental clinical competency (patient-based and simulated patient/manikin assessment)

On a manikin, you are placing a matrix band for a Class II amalgam restoration on a primary molar. Which step best ensures proper proximal contour?

  1. Leave the band loose to allow excess material to escape
  2. Omit wedging to speed the procedure
  3. Place the band above the gingival margin
  4. Adapt the band tightly to the adjacent tooth and wedge it gingivally Correct answer.

Explanation

Tight adaptation of the matrix band to the adjacent tooth, combined with wedging at the gingival level, restores proximal contour and prevents overhangs. A loose band or absent wedge produces poor contour and gingival excess.

Question 46Dental clinical competency (patient-based and simulated patient/manikin assessment)

During a simulated patient assessment, a patient with a history of radiotherapy to the head and neck requires an extraction. Which precaution is most important?

  1. Delay assessment until after the extraction
  2. Assess for osteoradionecrosis risk and consider hyperbaric oxygen therapy before surgery Correct answer.
  3. Proceed with multiple simultaneous extractions without assessment
  4. Use only local anaesthetic without any precautions

Explanation

Head and neck radiotherapy impairs bone healing and vascularity, raising the risk of osteoradionecrosis, so risk assessment and consideration of hyperbaric oxygen or a conservative approach are essential before extraction. Multiple simultaneous extractions increase this risk.

Question 47Dental clinical competency (patient-based and simulated patient/manikin assessment)

A patient in a simulated assessment has a buccally displaced maxillary canine with insufficient arch space. Which diagnostic aid best determines the position of the canine relative to the roots of adjacent teeth?

  1. A panoramic radiograph combined with a periapical or CBCT view Correct answer.
  2. A single bitewing radiograph
  3. A photograph of the buccal sulcus
  4. A lateral cephalometric radiograph alone

Explanation

A panoramic radiograph gives an overview of the displaced canine, and a periapical or CBCT view localises it in three dimensions relative to adjacent roots. Bitewing and lateral cephalometric views do not adequately show buccolingual position.

Question 48Dental clinical competency (patient-based and simulated patient/manikin assessment)

During a simulated patient assessment, a patient with Down syndrome is scheduled for a dental procedure. Which consideration is most important?

  1. Avoid all radiographs regardless of need
  2. Assume no medical precautions are needed
  3. Assess for atlantoaxial instability and airway concerns before positioning Correct answer.
  4. Use a fully reclined chair without assessment

Explanation

Patients with Down syndrome have an increased prevalence of atlantoaxial instability and airway anomalies, so careful positioning and airway assessment are important. Routine precautions should not be abandoned without assessment.

Question 49Dental clinical competency (patient-based and simulated patient/manikin assessment)

A patient reports a burning sensation on the tongue and a dry mouth, and examination shows erythematous candidiasis. Which predisposing factor should be evaluated first?

  1. Regular use of dental floss
  2. Consumption of sugar-free chewing gum
  3. Occasional use of a fluoride mouthwash
  4. Use of inhaled corticosteroids or recent antibiotic therapy Correct answer.

Explanation

Inhaled corticosteroids and recent antibiotic therapy are common predisposing factors for oral candidiasis, so the medication history should be reviewed first. Sugar-free gum, flossing, and fluoride rinses are not typical causes.

Question 50Dental clinical competency (patient-based and simulated patient/manikin assessment)

On a manikin, you are preparing an access cavity in a maxillary first molar. Which feature best indicates the correct outline form?

  1. A triangular access confined to the mesial half
  2. An access that removes the entire mesial marginal ridge
  3. A round access placed at the centre of the occlusal surface
  4. The access outline reflects the shape of the pulp chamber with the mesiobuccal canal orifice located Correct answer.

Explanation

The access outline should mirror the shape of the pulp chamber, and in a maxillary first molar it typically appears triangular or rhomboid with the mesiobuccal orifice located under the mesiobuccal cusp. A round access may miss canal orifices and compromise cleaning.