Survey on base contour of mandible distal-extension partial denture

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  • 下顎遊離端欠損部分床義歯の床外形に関する実態調査

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According to the current denture education at dental universities, the base contour of mandible distal-extension partial denture is to be based on that of the complete denture―the buccal lines to extend beyond external oblique ridges, the posterior margin to cover the mesial half of the retro molar pads, and the lingual lines to exceed the mylohyoid lines. However, the dentures manufactured by many clinical dentists differ in their features from the education model. This paper is to report and discuss the results of questionnaire survey on dentures (200 cases) manufactured by clinicians. In order to better understand the dentures patients seek for, I conducted a survey on 200 mandible distal extension partial dentures from 24 dental offices. The findings of the survey are as follows; for 68％ of dentures their lingual lines were not exceeding mylohyoid lines; for 77％ of dentures their buccal lines were not extending to external oblique ridges; and for 81％ of dentures their posterior margins were not covering the mesial half of the retro molar pads. As such, mandible distal-extension partial dentures manufactured at clinics have deviated significantly in their base contours from the education model.

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