歯の動揺度テスタを用いたインプラントの機能評価と生体リズム測定(3部代替・評価)

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We have previously developed an automatic diagnostic system for tooth mobility, for measuring the biomechanical properties of human periodontium. This paper presents a new application of the system in evaluation of oral implant function and the biological rhythm in tooth mobility, and it introduces the more favorable instrument, T-M tester and its further improvements. The IMZ implant system contains an intramobile mechanism, which was inferred to possess a stress-breaking function. To ascertain whether the IME is able to absorb or disperse oral stress effectively, we first fabricated the superstructure of the IMZ with gold alloy, then inserted a polyoxymethylene (POM) element and titanium element into the implant body alternately, and finally measured the horizontal mobility of the superstructure of IMZ with the automatic diagnostic system for tooth mobility. We found that the values of mechanical parameters (c_1, c_2, and k) in the titanium element were higher than those in natural teeth, while the POM's resemble those of natural teeth. The results indicated that the IME possessed a mobility functions which was similar to the natural teeth. For investigating the daily variation of tooth mobility, the horizontal mobility of maxillary central incisors in young women was measured by our system. The basal body temperature was also recorded simultaneously. Our results showed that daily variations in tooth mobility exist in women, and that the mobility during the lutein phase is greater than that during the follicular phase. Since the impedance head of the automatic diagnostic system is too large to measure mobility in an implant abutment and a molar, a simplified testing instrument called T-M tester was developed. In this tester, a sinusoidal vibration is applied to the tooth, the acceleration response is detected, and an MI (mobility index) corresponding to the tooth movement is obtained. The tester is characterized by its portable size and rapid measurement. It was used to measure quantitatively not only the mobility of maxillary and mandibular teeth (implants) but also diurnal variations in physiological mobility. Recently, a tooth-movement transducer using bender-type piezoelectric ceramics has been developed for the probe of the tester, making the probe even smaller and lighter than before. The new type Tooth Mobility tester is very convenient for examination of tooth mobility in any teeth, in both vertical and horizontal directions. In the near future, we will use it routinely in clinics to measure both tooth and implant mobility.
バイオメカニズム学会の論文
1998-11-25

歯の動揺度テスタを用いたインプラントの機能評価と生体リズム測定(3部代替・評価)

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歯の動揺度テスタを用いたインプラントの機能評価と生体リズム測定(3部 代替・評価)

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歯の動揺度テスタを用いたインプラントの機能評価と生体リズム測定(3部代替・評価)