A cavity prep that includes the mesial incisal angle of the maxillary central incisor is classified as which class?

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Multiple Choice

A cavity prep that includes the mesial incisal angle of the maxillary central incisor is classified as which class?

In Black’s classification, a lesion on the proximal surface of an anterior tooth that involves the incisal edge or angle is Class IV. The mesial incisal angle of the maxillary central incisor is exactly an anterior proximal surface that reaches the incisal angle, so it fits this category. Class II refers to proximal surfaces of posterior teeth, Class III to anterior proximal surfaces not involving the incisal edge, Class I to pits/fissures on occlusal surfaces, and Class V to the gingival third of facial or lingual surfaces.

In Black’s classification, a lesion on the proximal surface of an anterior tooth that involves the incisal edge or angle is Class IV. The mesial incisal angle of the maxillary central incisor is exactly an anterior proximal surface that reaches the incisal angle, so it fits this category.

Class II refers to proximal surfaces of posterior teeth, Class III to anterior proximal surfaces not involving the incisal edge, Class I to pits/fissures on occlusal surfaces, and Class V to the gingival third of facial or lingual surfaces.

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