Stafford G D, Caputo A A, Turley P K
University of California, Los Angeles, USA.
Angle Orthod. 1998 Aug;68(4):319-26. doi: 10.1043/0003-3219(1998)068<0319:COHRMS>2.3.CO;2.
The risk of serious eye injury caused by a headgear appliance is a significant concern. Various safety release mechanisms have been developed in order to help prevent this type of injury, but little testing has been done. The purpose of this study was to test 18 headgear release mechanisms. Four characteristics were evaluated: force at release, extension at release, consistency of release, and performance at different rates of pull. At the point of release, mean force values ranged from 5.33 pounds to 32.83 pounds, and mean extension values ranged from 0.84 inches to 2.93 inches. Consistency was based on the percent standard deviation, and the appliances were ranked relative to each other. Nine of the 18 appliances had statistically significant differences in the two pull rates for either variable or both, but the clinical significance is uncertain. The results show a wide range of performance among the 18 appliances tested and indicate that some perform better than others.
头帽矫治器导致严重眼部损伤的风险是一个重大问题。为了帮助预防此类损伤，已经开发了各种安全释放机制，但相关测试却很少。本研究的目的是测试18种头帽释放机制。评估了四个特性：释放时的力、释放时的伸展、释放的一致性以及不同拉伸速率下的性能。在释放点，平均力值范围为5.33磅至32.83磅，平均伸展值范围为0.84英寸至2.93英寸。一致性基于标准偏差百分比，并且对矫治器进行了相互排名。18种矫治器中有9种在两种拉伸速率下，对于其中一个变量或两个变量都存在统计学上的显著差异，但临床意义尚不确定。结果显示，在所测试的18种矫治器中性能差异很大，表明有些矫治器比其他矫治器表现更好。
