人工唾液环境下弹力链力值衰减的相关因素分析  

Factors on force degradation of elastomeric chains in vitro

作　　者：桑婷[1] 伍军[1] 

机构地区：[1]南昌大学附属口腔医院正畸科,江西南昌330006

出　　处：《上海口腔医学》2008年第6期638-642,共5页Shanghai Journal of Stomatology

摘　　要：目的:了解连接体类型、圈数、初始力对弹力链力值衰减的影响。方法:在37℃人工唾液中保持各连接体类型、圈数组合的弹力链不同初始力时的拉伸长度,4周内在不同时间点测量各弹力链的剩余力,采用SPSS11.5软件包计算剩余力百分比并进行方差分析。结果:不同组合的弹力链力值在4h时剩余力降至初始力的60%～90%,24h时降至50%～80%,24h后的各时间点间力值相对稳定,4周时剩余力降至40%～70%。连接体类型对力值衰减影响的差异有统计学意义(P<0.01),中距型、短距型、紧密型及长距型剩余力百分比依次增大;圈数对力值衰减影响的差异有统计学意义(P<0.01),2、3、4、5个圈数剩余力百分比依次增大;初始力对力值衰减影响的差异无统计学意义(P>0.05)。结论:弹力链力值在4h内衰减最快,24h后衰减趋于稳定;连接体越短,力值衰减越慢;圈数越多,力值衰减越慢;初始力对力值衰减速度无明显影响。PURPOSE： To evaluate the influence of factors of type of filament, number of loops, initial force on force degradation of elastomeric chains. METHODS： The chains of different type of filament and number of loops were stretched to produce specified initial force,and the stretched length of different groups of chains was maintained in artificial saliva of 37℃. The remaining force were recorded at some appointed moment in 4 weeks. Then the percentage of remaining force was calculated and the statistical processed with analysis of variance using SPSS 11.5 software package. RESULTS： The percentage of remaining force was between 60% and 90% at the initial 4 hours, between 50% and 80% at first 24 hours, and between 40% and 70% after 4 weeks. The influence of filament and loops was statistically significant （P〈0.01）.The percentage of remaining force of medium, mini, small, large filament types increased in sequence, and 2, 3, 4,5 loops increased in sequence.Whereas the differences of various initial force were not significant （P〉0.05）. CONCLUSIONS： The force of all groups of elastomeric chains degrades most quickly within the initial 4 hours , and the degradation tends to be stable after 24 hours.The shorter the filament, the more slowly the force degrades. As the number of loops increases, the force degradation rate decreases. The initial force has no impact on force degradation rate.

关 键 词：弹力链 力值衰减 正畸 

分 类 号：R783.5[医药卫生—口腔医学]