A measurement of clasp forces on teeth.
A measurement of clasp forces on teeth.
复制标题
牙齿上的夹紧力的测量。
DOI：
10.1016/0022-3913(71)90147-8
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发表时间：
1971
期刊：
影响因子：
--
通讯作者：
C. Jaslow
中科院分区：
文献类型：
--
作者：
J. A. Clayton;C. Jaslow
本文介绍了一种测量卡环向基牙传递力的方法，并对锻丝卡环和铸棒卡环的卡环效果进行了对比研究。用电阻应变片测量卡环的弯曲度和卡环对基牙的作用力。铸棒卡环比等长的锻丝卡环更柔韧。当活动义齿基托处于静止状态时，所有受试卡环均对牙齿施加作用力。当铸件就位并从模型中取出时，锻造金属丝卡环弯曲更大的距离，并对基牙施加更大的力。施法底座移动时，卡环所施加的力量各不相同，但却有一个规律。两种卡环的力均随基托的压低而增加，但锻丝卡环比铸棒卡环的力大，当考察力的方向和结果时，测得的力可能有意义。锻丝卡环可能会使基牙向远中舌侧倾斜，而铸棒卡环可能会迫使牙齿向近中舌侧倾斜，本研究的结果对目前用于证实延伸部分义齿卡环设计的一些经验理论提出了质疑。看来，理论和实践并不总是一致的;因此，理论应进一步检验。
A method that measures the force which clasps transmit to abutment teeth was developed and a comparative study was made between the effectiveness of a wrought wire clasp and that of a cast bar clasp. A transducer, using a resistance strain gauge, measured the flexure of clasps and the forces exerted by the clasps on abutment teeth. The cast bar clasps were more flexible than the wrought wire clasps of equal length. All of the clasps tested exerted forces against the teeth when the removable partial denture bases were at rest. The wrought wire clasps flexed a greater distance and exerted more force against the abutment teeth when the casting was seated and removed from the model. The forces exerted by the clasps when the casting bases were moved were different from each other and yet followed a pattern. The force increased for both types of clasps as the bases were depressed; however, the wrought wire clasp exerted more force than the cast bar clasps.The forces measured could be significant when the direction and the result of the forces were examined. The wrought wire clasps may tilt the abutment tooth distolingually and the cast bar clasp may force the tooth mesiolingually.The results of this study question some of the empirical theories used today to substantiate extension partial denture clasp designs. It appears that the theoretical and the practical do not always agree; therefore, the theoretical should be tested further.