診療姿勢が全部鋳造冠支台形態へ及ぼす影響について

下顎左側第1大臼歯

抄録

In our laboratory, we have been studying the reduction tendency seen when the fullcast crown preparation is done on a patient in “Home Position” which, among the various “Random Position” methods, particularly enables a dentist to approach his patient in a stable posture. Up to now, we have been studying this subject and have published a number of reports on the results of our studies conducted with regard to the upper left and right molars and lower right first molar. This time, the authors, in addition to using the results of their previous studies as reported, have had the full-cast crown preparation done by Home Position Dentistry with regard to the lower left first molar as well and made a quantitative analysis of the reduction tendency of abutment tooth. As a result of these analysis and examination, the following conclusion was obtained:
When the preparation was full-cast crown was done for the lower left first molar on a patient in the Home Position, a tendency was invariably noted, the same as in the case of preparation for the lower right first molar, of the preparation being done in such a way as to tip toward the direction of approach by the dentist to the patient. In that it enables even preparation of abutment-tooth, the Home Position has almost attained its objective and, especially in view of the fact that it is a system suited to the gross reduction which is an overall reduction, the Home Position may be regarded as a system that can clinically be given a high evaluation.