摘要
目的 分析口腔正畸乳胶牵引圈在口内24h内力值衰减的过程,为正畸医师临床使用正畸乳胶牵引圈提供参考.方法 选择临床常用的六种正畸乳胶牵引圈,弹力参数为3.5oz和2oz,圈内径参数为1/4英寸、5/16英寸、3/8英寸.制作个性化的透明压膜保持器,将牵引圈固定于保持器并拉伸至设定拉伸距离,戴入口内后,测量0、0.5、1、1.5、2、3、4、6、10、16、24h的弹力值,统计弹力变化趋势.结果 牵引圈在口内带入最初的0~1.5h内弹力衰减最快,此后衰减速度减慢,24h后弹力衰减量在15.6%~18.8%.相同时间点,同一圈内径下, 3.5oz组牵引圈弹力衰减量比2oz组小.相同时间点,同一设定弹力值下,内径越大的牵引圈弹力衰减越小,衰减速度越慢(3/8英寸<5/16英寸<1/4英寸)(P<0.05).结论 正畸乳胶牵引圈弹力在口内的0~1.5h内衰减最快.内径越大,设定力值越大,弹力值衰减越慢.建议正畸临床定期更换牵引圈.
Objective To analyze the decay of elasticity value of the orthodontic latex elastics in the mouth within 24 hours. Methods Six different kinds of orthodontic latex elastics commonly used in clinic were chosen. The elastics were divided into 1/4in.3.5oz,1/4in.2oz,5/16in.3.5oz, 5/16in.2oz,3/8in.3.5oz and 3/8in.2oz groups according to inner diameter and elastic parameter. Personalized film retainer was made for holding the orthodontic latex elastics with specific length in mouth,then the elasticity values were measured at 0,0.5,1,1.5,2,3,4,6,10,16,24 hours. Results The elasticity value of all groups decreased sharply in early 1.5 hours,then the decay rate slowed down,the elastic attenuation was 15.6%-18.8% after 24 hours. When tested at the same time point,the elastic attenuation of the 3.5oz group was smaller than that of the 2oz group,meanwhile, under the same setting elastic value,the greater the inner diameter of the elastic,the smaller the attenuation of the elastic force(3/8in.<5/16in.<1/4in.) (P<0.05). Conclusion The elasticity value of the orthodontic latex elastics decreases sharply in early 1.5hours. The larger the inner diameter and the setting force value,the slower the elasticity value decay,indicats that elastics should be change appropriately in clinics.
出处
《浙江临床医学》
2018年第12期1963-1964,1967,共3页
Zhejiang Clinical Medical Journal
基金
国家自然科学基金(81200802).
关键词
正畸乳胶牵引圈
弹性衰减弹力
Orthodontic latex elastics
Elastic attenuation elasticity
