Restorative Dentistry and Endodontics
What the exam expects
This domain covers cavity design, adhesive dentistry, direct and indirect restoratives, pulp biology, access and shaping, irrigation, obturation, and retreatment. Expect items that blend materials science with clinical decision-making.
Core concepts to master
- Adhesion: total-etch vs self-etch, smear layer, hybrid layer, dentin moisture control, and why enamel bonding is more reliable than dentin bonding.
- Caries removal and preparation: minimally invasive philosophy, peripheral seal, resistance and retention form, cuspal coverage thresholds.
- Endodontic diagnosis: pulp vitality testing (cold, EPT), periapical diagnosis, differentiating reversible pulpitis, irreversible pulpitis, and asymptomatic apical periodontitis.
- Shaping and irrigation: apical patency, working length, taper, sodium hypochlorite concentration and tissue dissolution, EDTA for smear layer, activation methods, and the danger of extrusion.
- Obturation and outcome: length and density, sealer types, coronal seal, and factors that predict healing.
Traps
- Confusing sensitivity to cold that lingers (irreversible) with sharp transient response (reversible).
- Assuming a radiographically short fill always fails; length is one factor among many, and overextension is generally worse than slight underextension.
- Forgetting that NaOCl does not remove the smear layer and does not decalcify - that is EDTA.
- Mixing up retention (resists displacement along the path of insertion) with resistance (resists fracture).
Rule of thumb
For endodontic items, use the diagnosis-drives-treatment chain: symptom pattern → pulpal diagnosis → periapical diagnosis → procedure. Worked example: a tooth with spontaneous nocturnal pain, a deep restoration, a normal periapical radiograph, and a lingering response to cold is diagnosed as symptomatic irreversible pulpitis with normal apical tissues - so the answer is pulpectomy/root canal therapy, not a sedative filling or extraction.