正畸乳胶牵引圈拉伸性能的测定  

The research on tensile properties of orthodontic latex elastics

作　　者：朱惠芳[1] 杨陆一 董妍[1] 姜玮[1] 牟胤赫 吴嫣然[1] 滕蓉[1] 

机构地区：[1]吉林大学口腔医院正畸科,长春130021

出　　处：《国际口腔医学杂志》2015年第4期423-425,共3页International Journal of Stomatology

摘　　要：目的 测定临床常用的4种正畸乳胶牵引圈的拉伸性能。方法 选择具有相同弹力参数的正畸乳胶牵引圈,根据圈内径分为3/16组、1/4组、5/16组和3/8组,使用电子拉伸实验机分别进行力学测定,分析4种牵引圈在0~60 mm形变范围内形变量与载荷的关系,建立形变-载荷对照表。结果 圈内径、形变量对乳胶牵引圈载荷均有显著影响（P=0.000）;相同形变量不同牵引圈载荷有显著性差异;形变量在5~40 mm范围内各牵引圈的形变-载荷曲线近似直线关系,斜率间的差异无统计学意义;在3倍拉伸长度下,1/4组与3/8组牵引圈载荷和弹力参数间的差异无统计学意义（P〉0.05）,而3/16组与5/16组牵引圈载荷和弹力参数间的差异有统计学意义（P〈0.05）。结论 正畸乳胶牵引圈的载荷随圈内径及形变量的变化而变化,临床上应当根据所需力值大小选择合适的牵引圈。Objective To test the tensile properties of four kinds of orthodontic latex elastics commonly used in clinic. Methods Four kinds of orthodontic latex elastics with the same elastic parameter were chosen. The elastics were divided into 3/16, 1/4, 5/16 group, and 3/8 groups according to inner diameter. An electronic universal mechanical testing machine was used to test their specialized mechanical properties. The relation between load and the deformation of the four elastics within 0 mm to 60 mm strain range was determined, and deformation-load tables were established. Results Inner diameter and deformation value both influenced the load of the orthodontic latex elastics（P=-0.000） significantly. The deformation-load curve approximated linear relationship in the range of 5 mm to 40 mm deformation, and the slopes were of no statistical significance. The load of different elastics with the same deformation was substantially different. The 1/4 and 3/8 groups showed no significant difference between the inner diameter elastics load and the corresponding standard value（P〉0.05） under triple stretch length, whereas the 3/16 and 5/16 groups did（P〉0.05）. Conclusion The load of the orthodontic latex elastics varied with the inner diameters and deformation, indicating that elastics should be selected appropriately based on the value of the force required in clinics.

关 键 词：正畸 乳胶牵引圈 拉伸性能 

分 类 号：R783.5[医药卫生—口腔医学]