Question 247 · LDEK · Cavity preparation
Which of the following concerning bevelling of the enamel margin before placing composite resin restoration is true?
1) bevelling is recommended in the preparation of anterior teeth;
2) in posterior teeth bevelling should be placed on the occlusal surfaces or on other areas loaded with occlusal forces;
3) the bevel is prepared at 45-degree angle to the external tooth surface with a flame-shaped or round diamond instrument;
4) if the preparation extends gingivally onto the root structure, the bevel should be placed in the cementum;
5) bevelling results in the increase in enamel surface area for bonding and improves the esthetic result of tooth-restoration interface.
The correct answer is:
2) in posterior teeth bevelling should be placed on the occlusal surfaces or on other areas loaded with occlusal forces;
3) the bevel is prepared at 45-degree angle to the external tooth surface with a flame-shaped or round diamond instrument;
4) if the preparation extends gingivally onto the root structure, the bevel should be placed in the cementum;
5) bevelling results in the increase in enamel surface area for bonding and improves the esthetic result of tooth-restoration interface.
The correct answer is:
- A. 1,2,5.
- B. 1,3,5.
- C. 1,4,5.
- D. 2,3,4.
- E. 2,4,5.
Hint
Bevel only where enamel prisms can be cut across and where a thin composite edge will not carry occlusal load.
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