The procedure (in Class III restoration) shown is:: (A) Smoothening of enamel margin, (B) Beveling of the external tooth surface, (C) Refining the proximal walls, (D) Flaring of proximal walls
Answer is B. Larger preparations may require additional beveling of the accessible enamel walls to enhance retention by bonding these enamel margins, which are beveled with a flame-shaped or round diamond instrument.
The bevel is prepared by creating a 45-degree angle to the external surface and to a width of 0.5 to 2 mm, depending on the size of the preparation, location of the margin, and esthetic requirements of the restoration.