A mesioingual restoration on tooth number 7 is classified as which class?

A mesioingual restoration on tooth number 7 is classified as a Class III restoration. Class III restorations are found on the proximal surfaces of anterior teeth, specifically affecting areas that are not visible in a full smile, such as the mesial or distal surfaces of incisors and canines. Since tooth number 7 is an upper left central incisor, a mesioingual restoration implies that the repair involves the mesial and lingual surfaces of this tooth.

This classification considers both the location of the carious lesion and the surfaces involved in the restoration. In contrast, Class I restorations are confined to the pits and fissures, while Class II are for posterior teeth affecting the mesial and distal surfaces. Class IV would involve anterior teeth as well, but it includes the incisal edge or corners, which is not the case here. Therefore, regarding tooth number 7 and the described restoration site, Class III is indeed the appropriate classification.