Morikawa A
2nd Department of Prosthodontics, School of Dentistry, Tokyo Medical and Dental University.
Kokubyo Gakkai Zasshi. 1994 Jun;61(2):250-74. doi: 10.5357/koubyou.61.250.
The purpose of this investigation is to detect vertically and buccolingually the occlusal force on the lower first molar in function and to make a two-dimensional vector analysis concerning the occlusal force. The subminiature occlusal force measuring apparatus, which makes use of two-dimension load cell, is developed with the apparatus equipped in the corona on the natural root of the tooth, each occlusal force on the single tooth is detected, when three subjects clench and masticate four kinds of test-foods. Conclusions are as follows: 1. Average occlusal force exerts 3.6 kgf during light clenching and 25.7 kgf during heavy clenching. The average direction of occlusal force against the tooth axis exerts 21.2 degrees during light clenching and 19.5 degrees during heavy clenching. 2. The masticatory force intensity exerts the differences in the phases of mastication and the properties of the test-foods. The maximal masticatory force is 33.1-7.9 kgf during the initial phase and 9.6-5.1 kgf during the last phase of mastication. 3. Average direction of masticatory force against the tooth axis is 19.9 degrees during the initial phase and 27.8 degrees during the last phase of mastication. 4. The operating period of masticatory force per cycle is 0.331 second on the average during the process of mastication. The longest period is in the initial phase of mastication, and as the mastication proceed it gradually decreases.
本研究的目的是检测下颌第一磨牙在功能状态下垂直向和颊舌向的咬合力，并对咬合力进行二维矢量分析。利用二维测力传感器开发了超小型咬合力测量装置，将该装置安装在天然牙根的牙冠上，在三名受试者咬紧和咀嚼四种测试食物时，检测单颗牙齿上的咬合力。结果如下：1. 轻度咬紧时平均咬合力为3.6千克力，重度咬紧时为25.7千克力。咬合力相对于牙轴的平均方向在轻度咬紧时为21.2度，重度咬紧时为19.5度。2. 咀嚼力强度在咀嚼阶段和测试食物的性质方面存在差异。咀嚼初始阶段的最大咀嚼力为33.1 - 7.9千克力，咀嚼最后阶段为9.6 - 5.1千克力。3. 咀嚼力相对于牙轴的平均方向在咀嚼初始阶段为19.9度，咀嚼最后阶段为27.8度。4. 在咀嚼过程中，每个周期咀嚼力的作用时间平均为0.331秒。最长时间出现在咀嚼初始阶段，随着咀嚼进行逐渐减少。
