歯の動揺度に関する研究 : (1)箔ストレンゲージを応用した臼歯の動揺度測定装置について

概要

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Exact measurement of tooth mobility is very important for diagnosis of periodontal disease. Although many instruments of measuring tooth mobility have been published, the majority of them are devices of measuring the incisor, and only a few devices have been discribed that are capable of measuring the molar tooth mobility. The purpose of this study is to make an electric new instrument of measuring molar tooth mobility. (1) This instrument is composed of three parts: the apparatus of measuring the tooth displacement, forcemeter and recorder-set. The load and the displacement of tooth are changed to the electric amount by means of foil phestel strain-gage, amplituded and recorded continuously on X-Y recorder. (2) The calibration and accuracy of the instruments was discussed on the model and clinically. Relative error was 5.4% at 100g, 1.7% at 500g on the model and 6.9% (100g), 4.0% (500g) on second molar. (3) The oral part of this apparatus is very small size and light weight, so that it can be fixed easily in oral cavity. Then this instrument is capable of measuring molar tooth mobility with an accuracy 1μ ±6.9%. (4) Force-movement curves of molar teeth were similar to that of front teeth reported by Muhlemann. The recovery curve after removing force and the displacement by the time can be also recorded by pen recorder.
特定非営利活動法人日本歯周病学会の論文
1978-03-28