Provision of Clinical Dental Hygiene Services
What the exam tests
This domain follows the process of care: assessment (health history, periodontal charting, radiographs, risk assessment), dental hygiene diagnosis, care planning, implementation, evaluation, and documentation. Implementation covers nonsurgical periodontal therapy, instrument selection and adaptation, fluoride and sealants, local anesthesia, polishing, and infection control. Also expect standard precautions, sterilization monitoring with biological indicators, medical emergency management, and scope-of-practice regulations.
Traps that recur
- Staging versus grading. Stage describes severity (clinical attachment loss, probing depth, radiographic bone loss, tooth loss from periodontitis); grade describes rate of progression and risk (bone loss divided by age, HbA1c, smoking).
- Instrument selection. Sickle scalers are supragingival and remove heavy calculus; universal curets adapt to all surfaces; Gracey curets are area-specific (1/2 and 3/4 anterior, 5/6 anterior and premolar, 7/8 posterior facial/lingual, 11/12 posterior mesial, 13/14 posterior distal).
- Radiography. Bitewings detect interproximal caries; panoramic images are not a caries survey. Use the SLOB rule (same lingual, opposite buccal) for object movement.
- Fluoride numbers. 5% NaF varnish is about 22,600 ppm; 1.23% APF gel is about 12,300 ppm; OTC dentifrice is 1,000–1,500 ppm. The probable toxic dose is 5 mg/kg.
- Ultrasonics. Avoid over demineralized enamel, communicable disease, and uncontrolled bleeding; consult before use with implanted cardiac devices.
Worked example
A facial site shows 5 mm probing depth with 3 mm of recession. CAL is not the pocket depth; it is recession plus probing depth, so CAL equals 8 mm. Stage from CAL and bone loss, then assign grade from progression risk.