Incidence of the Appearance of the Teeth and Gingiva during Functional Lip Movements

Abstract

In this study, we used a standardized video recording system to observe the teeth and gingiva which were exposed to view during functional lip movements. These observations are thought to offer valuable information for selecting appropriate types and designs of crowns. For this study, 116 volunteers were chosen, and the following results were obtained.(1) The labiocervical margin design of the upper anterior crowns is of significant importance because most people expose the gingival tissues.(2) The labiocervical margin design of the upper premolar and the lower anterior crowns should be selected for each patient because some people expose the gingival tissues thereof.(3) The lower premolars should be restored with a full veneer type restoration. A metal collar for the labiocervial margin form would be acceptable because few people expose the gingival tissues thereof.