顎変形症例に対する発音法による咬合位設定

概要

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A method was designed to determine the manclibular positions during speech ; in which three phenomena, namely, -(1) the path of the mandibular movements, (2) the spectrogram of the voice, and (3) the voice sound -were simultaneously recorded on the same frame of 16 mm motion picture films. The method was applied to predict acceptable occlusal vertical dimention (O. V. D.) for a patient with mandibular prognathism before surgical correction. The O. V. D. was gradually increased by setting resin blocks on the occlusal surface of the mandible. At various O. V. D., the mandibular positionas during pronunciation of/s, sh, m/ were observed. As a result, it was found that the mandibular positions of each consonautts were almost constant regardless of the difference in O. V. D. to some extent. Within this range, the O. V. D. was increased and the mandibule was retruded to the esthetically ideal position by surgery. Just before the operation, provisional bridges with guide pins and holes were cemented to keep predetermined interrnaxillary relation during surgical retrusion of the matadible. Two and six months after the operation, the mandibular movements during speecla sltowed normal pattern and the precise intercuspal position was established.
日本補綴歯科学会の論文
1987-12-01