診断機能を備えた歯科用超音波スケーラの開発(<小特集>運動と振動の制御の21世紀への新展開)

概要

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An ultrasonic dental sealer is an equipment to remove dental calculi from teeth. A conventional sealer consists of handpiece with a Langevin type ultrasonic transducer and a driver circuit to vibrate at resonance frequency. The transducer has a horn to enhance vibration and a tip to scale the calculi. On the back of the transducer, a rubber hose is connected to supply water to the scaling points. Such a transducer has two problems. One is vibration damping due to the water hose. The other is resonance frequency shift according to contact load on the tip. Two types of transducer are fabricated to compare influence of the hose connecting method. Measuring electric Q factor with water flowing, side connection seems to decrease the damping rather than back connection. A new transducer is designed based on the comparison result. To trace the frequency shift, we develop a resonance trace system. Arranging operating frequency based on detected current phase, the system can trace mechanical resonance with time delay of 17ms. We also propose teeth diagnosis using the resonance trace system. Observing the resonance frequency shift when the tip contacts a material, stiffness of the material can be estimated. The shift comparison result between a damaged tooth and a fine tooth shows possibility of dental caries diagnosis.
社団法人日本機械学会の論文
2006-09-25