Figure 3. Equivalent stress distribution of adhesives in the three groups a-c: distribution of equivalent stress of adhesives; d-f: distribution of equivalent stress of adhesives in the buccolingual direction, with the maximum stress concentrated at the angle of the axial medullary line at the bottom of the cavity; g: maximum stress of the adhesive repair model; group A: the cavosurface angle is 90°; group B: the cavosurface angle is 120°; group C: the cavosurface angle is 135°