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Pressures being exerted on the buccal and lingual surfaces of the first lower molar from the surrounding cheek and tongue during various mouth functions were investigated to make clear the functionally acceptable buccal-lingual position of the artificial posteriors in a complete denture. Five subjects who were missing only their first lower molars participated in this study and the pressures were recorded by miniature pressure sensors placed on both the buccal and lingual surface at the area where the teeth are missing. Two kinds of movements consisting of the specially conditioned and swallowing were selected from the various mouth functions in this report. Pulling their mouth corners backward by themselves, intentional occlusion, thrusting their lips, thumb-sucking and mandibular lateral movement were included in the former. The findings were as follows; 1. A distinct high value of pressures was obtained on the buccal surface by pulling their mouth corners backward and by intentional occlusion 1 (maximal biting) . On the other hand, a slight pressure was recorded on both surfaces by thrusting their lips, intentional occlusion 2 and mandibular lateral movement, and also on the lingual surface by pulling their mouth corners backward. However, variations in the pressure values recorded among the subjects were recognized, and not only positive but also negative values were indicated on the lingual surface by thumb-sucking. 2. High pressure values and time-pressure integrals were obtained by swallowing, and the value of pressure by empty swallowing was higher than by water swallowing. Moreover, pressures recorded on the lingual surface by swallowing were often greater than on the buccal surface.

Muscle pressures exerted upon the buccal and lingual surfaces of the lower molar region.