前伸平衡的相关因素及各因素间的相互关系

The Relative Factors of Protrusive Balanced Occlusion and the Relationship Among Them

目的 :探讨前伸平衡的相关因素及各因素间的相互关系。方法 :从前伸平衡的基本要求及前伸运动过程中 ,下颌后牙颊尖的运动轨迹 ,提出牙尖运动斜度这一新的概念 ,并运用数学轨迹及坐标轴转换原理推导出牙尖运动斜度的计算公式。结果 :牙尖运动斜度等于牙尖工作斜面斜度是获得前伸平衡的首要条件。牙尖运动斜度与髁道斜度、切道斜度和牙坐标值成正比例关系。牙尖工作斜面斜度与牙尖斜度和牙长轴倾斜度成正比例关系。结论 :牙尖运动斜度是前伸平衡中最基本。

Objective: The experiment was designed to study the condition for achieving protrusive balanced occlusion and the factors involved in occlusal equilibration. Methods: For achieving protrusive balanced occlusion, the posterior teeth of mandible always contacted with the posterior teeth of maxilla in the process of protrusive occlusive movement. The angle between the line of movement track of mandible cusp in the process of protrusive occlusive movement and occlusion plane is called cusp movement inclination. A formula of calculation was obtained by using mathematics track and the conversion of coordinate axis. Results: The focus of protrusive balanced occlusion is relationship between the track of mandibular cusp movement and working incline of maxillary cusp. The first condition achieving protrusive balanced occlusion is that cusp movement inclination is equal to cusp working inclination of maxilla. The factors affecting cusp movement inclination are condyle path inclination; incisal path inclination and teeth coordinate. The factors affecting working inclination of cusp are cusp inclination and long axis obliquity. Conclusion: Cusp movement inclination is the basic and the most important concept in protrusive balanced occlusion.\;