For composite resin preparations, cavosurface enamel margins are bevelled because
1. a bevelled margin produces a more favorable surface for etching.
2. a bevelled margin improves the edge strength of the composite resin.
3. after etching, the bonding agent reduces microleakage.
4. the procedure eliminates the need to polish the restoration.

1 explanations

1. 

   oneguy

   When performing a composite resin cavity preparation, the enamel margin should be beveled in order to improve aesthetics and expose the ends of the enamel rods for acid attack and then decrease the microleakage.

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