総義歯における人工臼歯の咬合面形態の相違による咀嚼力および咬合力に関する研究 : 第3報 Lingual bladed teeth

概要

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In recent years, Levin has developed the lingual bladed teeth having a combined benefit of anatomic occlusal form and that of bladed teeth through an improvement of the conventional Sosin blade and their clinical effectiveness and masticatory function are reported to be quite favorable. For the purpose of elucidating possible effect of the lingual bladed teeth on the masticatory function, the author was concerned in these studies with an application of the semiconductar strain element and masticatory force measuring apparatus to measure the masticatory and antagonistic forces at swallowing, their electromyographic recordings being made at the same time. Further, the recorded masticatory force and EMG findings were subjected to integrated analyses, so that the amounts of both the masticatory and muscular activities could be obtained in a quantitative manner. As a result of this comprehensive study, the author arrived at the following conclusions. 1. The biting force at centric occlusion was found to be about 14 kg, that of lateral occlusion on the working side was about 13 kg, about 8 kg on the balancing side, and that of anterior occlusion was found to be about 5 kg. 2. In terms of the masticatory force, peanuts required approximately 12 kg, hams anywhere from 6 to 9 kg, and pickled radish (takuan) anywhere from 9 to 11 kg. In common with the different types of foods, the largest values were measured in the middle stage of masticatory activity. Further, when analyzed in terms of masticatory rhythms, the duration of electric discharge was short both in 2 and 3 period in the case of peanuts, and it was short in 4 period in the cases of hams and pickled radish, the tendency of short electric discharge being observed in 5 period in common with these various types of foods. The number of masticatory activity was the fewest on the part of peanuts followed by hams and pickled radish in order. 3. As for the masticatory rhythms of masticatory muscles, the duration of electric discharge, interval and frequency were all small in 3 period in common with the different types of foods under study. However, the ratio of electric discharge duration in a given frequency was found to be the smallest in 5 period. 4. In terms of muscular activity, it was small in 4 period in the cases of peanuts and hams, while it was the smallest in 5 period in the case of pickled radish. 5. In common with the various types of foods, theamount of masticatory force was small in 1 period whereas it was measured to be much larger in 3 period. 6. The amount of muscular activity required per unit of mastication was small in 5 period in the case of peanuts, whereas they were small in 4 period and in 3 period in the cases of hams and pickled radish respectively.
日本補綴歯科学会の論文
1982-04-01

著者

山口研一
日本大学大学院歯学研究科歯科臨床系

総義歯における人工臼歯の咬合面形態の相違による咀嚼力および咬合力に関する研究 : 第3報 Lingual bladed teeth

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