Bales T R, Chaconas S J, Caputo A A
Am J Orthod. 1977 Sep;72(3):296-302. doi: 10.1016/0002-9416(77)90215-9.
The force-extension characteristics for a wide range of elastics were determined. It was found that (1) selection of elastics were determined. It was found that (1) selection of elastics based on 3 x lumen size will probably result in more force being generated than was previously reported, (2) there is very little difference seen in force-extension characteristics when the two manufacturers' elastics are compared, and (3) for experimental purposes, elastic testing can be done in the dry state for force-extension characteristic studies. This investigation has shown that stretching an orthodontic elastic to twice its original lumen diameter produces a force which better represents the manufacturer's expected value. Keeping these principles in mind, a more effective tooth-moving force can be realized, enabling the clinician to properly select orthodontic elastics for intra- and intermaxillary biomechanical procedures.
测定了多种弹性体的力-伸长特性。结果发现：（1）基于3倍管腔尺寸选择弹性体可能会产生比先前报道更大的力；（2）比较两个制造商的弹性体时，在力-伸长特性方面几乎没有差异；（3）出于实验目的，弹性体测试可以在干燥状态下进行以研究力-伸长特性。这项研究表明，将正畸弹性体拉伸至其原始管腔直径的两倍时产生的力更能代表制造商的预期值。牢记这些原则，可以实现更有效的牙齿移动力，使临床医生能够为颌内和颌间生物力学程序正确选择正畸弹性体。
