Dentistry
Domain overview
The OMSB Dentist examination tests safe, evidence-based decision-making across restorative dentistry, endodontics, periodontics, oral surgery, pediatric dentistry, prosthodontics, oral medicine, and infection control. Items are usually patient scenarios asking for the next best step, most likely diagnosis, or safest management. The recurring principle is to stabilize urgent problems, take a focused history and examination, form a diagnosis, then choose the least invasive definitive treatment.
Core rules and concepts
- Caries: record caries risk (diet, fluoride exposure, salivary flow, active lesions, restorations) before treatment planning. High-risk patients need fluoride varnish, high-fluoride toothpaste, dietary counseling, and short recall.
- Periodontitis: use the 2018 classification to record stage (severity and complexity) and grade (progression risk), alongside probing depths, bleeding on probing, clinical attachment loss, and indicated radiographs.
- Pulpal and periapical diagnosis: use AAE terminology-normal pulp, reversible or irreversible pulpitis, necrosis; symptomatic or asymptomatic apical periodontitis; acute or chronic apical abscess.
- Antibiotics: adjuncts, not substitutes for drainage or removal of the cause. Prophylaxis follows current cardiac guidance and is not routine for prosthetic joints.
- Infection control: standard precautions for every patient, including hand hygiene, PPE, safe sharps handling, and validated sterilization monitoring.
Worked example
A 52-year-old with type 2 diabetes and dry mouth has active white-spot lesions and new cervical caries. The best initial management is not simply to restore the cavities. Active lesions plus dry mouth indicate high caries risk, so the plan should combine restorative care for cavitated lesions with cause-directed measures: fluoride varnish, high-fluoride toothpaste, sugar-free xylitol, medication review, glycemic liaison, and 3-month recall. Reasoning: the exam rewards managing the disease process, not only its visible defects.
Traps that cost marks
- Mixing periodontal stage with grade.
- Prescribing antibiotics for irreversible pulpitis without pulpal decompression or drainage.
- Stopping anticoagulants before extraction without medical consultation.
- Treating an oral ulcer as traumatic when red flags suggest malignancy.
- Ordering radiographs as a routine screen without a clinical indication.