Figure 2. Overall displacement and equivalent stress distribution in the repair models of the three groups a-c: overall displacement of equivalent stress, with the maximum displacement occurring in the composite resin part; d-f: overall distribution of equivalent stress, with the stress mainly concentrated in the enamel at the cavosurface and cervical enamel; g: maximum stress of the repair model; group A: the cavosurface angle is 90°; group B: the cavosurface angle is 120°; group C: the cavosurface angle is 135°
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