De Genova D C, McInnes-Ledoux P, Weinberg R, Shaye R
Am J Orthod. 1985 May;87(5):377-84. doi: 10.1016/0002-9416(85)90197-6.
In the last 20 years, synthetic elastic modules have been introduced to the orthodontist. However, force decay of these materials has been a clinical problem and the purpose of this project was to evaluate the force decay patterns of three commercially available elastomeric products--Ormco Power Chain II, Rocky Mountain Energy Chain, and TP Elast-O Chain--in a simulated oral environment. Thermal-cycled samples experienced less force decay over a 21-day period than samples stored at 37 degrees C. Furthermore, statistical analysis confirmed that there was a highly significant difference (p less than 0.01) between the mean force exerted by short modules and long modules for each material. Overall, modules producing higher initial forces (short modules) underwent less force decay after 21 days than did modules producing lower initial force values (long modules). All materials exerted 216 to 459 grams of force initially. After 21 days of simulated tooth movement, the force exerted by the elastic modules was 70 to 230 grams--a significant reduction (p less than 0.001).
在过去20年里，合成弹性模块已被引入正畸领域。然而，这些材料的力衰减一直是一个临床问题，本项目的目的是在模拟口腔环境中评估三种市售弹性体产品——奥美科动力链II（Ormco Power Chain II）、落基山能量链（Rocky Mountain Energy Chain）和TP弹性链（TP Elast-O Chain）——的力衰减模式。经过热循环的样本在21天内的力衰减比储存在37摄氏度的样本少。此外，统计分析证实，每种材料的短模块和长模块所施加的平均力之间存在高度显著差异（p小于0.01）。总体而言，产生较高初始力的模块（短模块）在21天后的力衰减比产生较低初始力值的模块（长模块）少。所有材料最初施加的力为216至459克。在模拟牙齿移动21天后，弹性模块施加的力为70至230克——显著降低（p小于0.001）。
