Operative & Restorative Dentistry for ORE Part 1
Essential review of composite resins, dental amalgam, glass ionomer cements, bonding agents, and SDCEP caries guidelines.
Key Syllabus Concepts Tested in Operative & Restorative Dentistry
- Composite resin fillers (Barium/Strontium radiopacity) and C-factor polymerization shrinkage stress
- Dental amalgam phases: High-copper amalgams eliminating corrosion-prone Gamma-2 (Sn8Hg) phase
- 10-MDP universal adhesive monomer chemical bonding to hydroxyapatite and zirconia
- SDCEP selective caries removal guidelines preserving pulpal vitality in asymptomatic teeth
Sample SBA Practice Questions
Sample Question 1 (Paper A)
In adhesive dentin bonding, the hybrid layer is formed by the penetration of resin monomers into which acid-etched dentinal structure?
- Hypermineralised peritubular dentine cuff
- Resin-tag-filled dentinal tubule lumens
- Partially dissolved smear layer debris
- Demineralised intertubular collagen fibre network
✅ Correct Answer: Demineralised intertubular collagen fibre network
Explanation: Phosphoric acid etching demineralizes intertubular dentin and exposes a delicate network of type I collagen fibers forming the hybrid layer.
Clinical Pearl: Parotid gland is purely serous, producing alpha-amylase rich saliva.
Sample Question 2 (Paper A)
Which cavity preparation feature provides resistance form against displacement of an amalgam restoration under occlusal forces?
- Buccal and lingual walls converging towards the occlusal surface
- Retention grooves cut into the proximal box line angles
- Flat pulpal floor cut perpendicular to the occlusal forces
- Dovetail extension of the occlusal outline form
✅ Correct Answer: Flat pulpal floor cut perpendicular to the occlusal forces
Explanation: A flat pulpal floor perpendicular to masticatory forces prevents tipping and wedging forces.
Clinical Pearl: Fluorapatite lowers enamel critical pH for demineralization from 5.5 down to 4.5.
Sample Question 3 (Paper A)
What is the principal component of glass ionomer cements (GIC) responsible for chemical adhesion to hydroxyapatite?
- (+)-Tartaric acid, the setting reaction modifier
- Polyacrylic acid, the ionisable polymer in the liquid
- Fluoroaluminosilicate glass, the ion-leachable powder
- 2-hydroxyethyl methacrylate, the hydrophilic resin monomer
✅ Correct Answer: Polyacrylic acid, the ionisable polymer in the liquid
Explanation: Polyacrylic acid carboxyl groups form ionic chelation bonds with calcium ions in enamel and dentin hydroxyapatite.
Clinical Pearl: Carbonic acid/bicarbonate (HCO3-) is the primary buffer system in stimulated saliva.
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