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Objectives. In the cavity preparation for direct aesthetic restoration of Class IV, the edge of enamel may be left to butt-joint or modified with a bevel or a chamfer to increase the adhesion area. Since this increase has never been demonstrated and quantified, the purpose of this paper is to theoretically calculate the differences in the enamel area intended for adhesion obtained by preparing a butt-joint, a 45 � bevel and a 1/4 ball chamfer of the same cavity margin, in order to enable the operator to compare the advantage obtainable in the adhesion by using one or the other of the preparations. The difficulty of using the values of the Cavosurfacial Angle (CSA) in this |
