Restorative & Materials · patient case question
For a Class IV composite restoration on a maxillary central incisor, where should the bevel be placed?
Patient case: Erosion in a High-Acid Diet
demo: 27-year-old female
chief: “My back teeth feel notched and everything is sensitive.”
history: Consumes 5–7 whole lemons daily. Reports nocturnal bruxism. No reflux, no purging behavior.
meds: None
findings: Cupped, smooth, glossy defects on the occlusal surfaces of the posterior teeth with amalgam restorations standing proud of the surrounding enamel. Generalized dentin hypersensitivity.
Show answer and explanation
Correct answer: B. On enamel, around the cavosurface margin
- A. Placing margins on cementum compromises the bond and invites recurrent caries.
- B. Correct. Beveling enamel exposes the ends of the enamel rods, which improves etch pattern and bond strength, and it blends the restoration margin optically for a better esthetic transition.
- C. Bevels on dentin do not improve bonding and weaken the remaining structure.
- D. The Class IV bevel is one of the standard indications for beveling in composite dentistry.
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