In which type of preparation is a bevel placed on enamel cavosurface margins of anterior preparations?

A bevel placed on the enamel cavosurface margins of anterior preparations is characteristic of a modified preparation. This type of preparation is specifically designed to improve the aesthetic and functional qualities of a restoration. The bevel enhances the transition between the tooth structure and the restorative material, making it less noticeable and helping to create a smoother finish. In anterior teeth, where aesthetics are particularly important, this technique is crucial as it helps to blend the restoration with the natural tooth structure.

Modified preparations are typically used when considering the esthetics of the restoration, as they allow for a more favorable contour and better light transmission through the tooth. This is especially relevant in anterior teeth, where natural appearances are paramount. Other preparation types, such as standard, simple, or deep preparations, do not specifically include this bevel technique or may not prioritize the aesthetic factors in the same way that modified preparations do.