Fuzisawa K
Kanagawa Shigaku. 1989 Dec;24(3):463-83.
In daily practice, cases of unilateral free-end saddle involving loss of two teeth are apt to cause problems such as a loss of function and injury on the abutment teeth due to instability of the dentures. In attempting to remedy these problems, a variety of prosthesis have been used and their dynamics analyzed. Nevertheless, dynamics during function, one basis for judging the relative worth of prostheses, remain unclear. In this study, modal analysis and linear-value analysis were used to derive values for the dynamics of the denture during function of a cone telescopic denture, an attachment denture and a clasp denture as well as impact on the abutment teeth. The following results were obtained: 1. Characteristic frequency and observation of animation showed that: (a) Mode #1 is the vibration mode for the entire system including the denture. (b) Mode #2 is the vibration mode for the abutment tooth itself. (c) Mode #3 is the mode for the resin or the metal frame of the denture. 2. In the direction of the tooth axis, the tendency for displacement of the abutment tooth decreased in the following order: unilateral clasp denture greater than bilateral clasp denture greater than cone telescopic denture greater than attachment denture. 3. In a bucco-labial direction, the order was as follows: unilateral clasp denture greater than bilateral clasp denture greater than cone telescopic denture greater than attachment denture. 4. In a mesio-distal direction, the order was as follows: unilateral clasp denture greater than attachment denture greater than cone terescpic denture greater than bilateral clasp denture. 5. A comparison with the clasp denture in terms of attenuation hints at the possibility that the design is superior with the cone telescopic denture and the attachment denture in cases of free-end saddle.
在日常临床实践中，单侧游离端鞍基缺失两颗牙齿的病例，由于义齿不稳定，容易导致功能丧失和基牙损伤等问题。为解决这些问题，人们使用了多种修复体并对其力学性能进行了分析。然而，作为判断修复体相对价值依据之一的功能过程中的力学性能仍不明确。本研究采用模态分析和线性值分析，得出圆锥型套筒冠义齿、附着体义齿和卡环义齿在功能过程中义齿的力学性能值以及对基牙的影响。结果如下：1. 特征频率和动画观察显示：(a) 模式#1是包括义齿在内的整个系统的振动模式。(b) 模式#2是基牙自身的振动模式。(c) 模式#3是义齿树脂或金属框架的模式。2. 在牙轴方向上，基牙位移趋势从大到小依次为：单侧卡环义齿＞双侧卡环义齿＞圆锥型套筒冠义齿＞附着体义齿。3. 在颊舌向，顺序如下：单侧卡环义齿＞双侧卡环义齿＞圆锥型套筒冠义齿＞附着体义齿。4. 在近远中方向，顺序如下：单侧卡环义齿＞附着体义齿＞圆锥型套筒冠义齿＞双侧卡环义齿。5. 与卡环义齿在衰减方面的比较表明，在游离端鞍基病例中，圆锥型套筒冠义齿和附着体义齿的设计可能更优越。
