The effects of variations in the opposing dentition on changes in the partially edentulous mandible. Part III. Tooth mobility and chewing efficiency with various maxillary dentitions.

Tests were conducted using a mobilometer to determine the effects of the opposing dentition on mobility of selected teeth in the partially edentulous mandible. In addition, the effect of the opposing dentition and the presence or absence of a lower removable partial denture on chewing efficiency was evaluated. Results indicated an increase in mobility of abutment teeth following placement of removable partial dentures. The mobility decreased as the teeth became stabilized by the removable partial dentures. The amount of mucosal and bone-contour change was directly related to the degree of mobility of the abutment teeth. Comparisons in chewing efficiency indicated no particular difference between subjects with unilateral or bilateral distal-extension removable partial dentures or in the type of opposing dentition. However, the use of a lower removable partial denture does increase chewing efficiency to a level of about 50 per cent of that found for subjects with all of their natural teeth.