不同种类镍钛弓丝与Damon自锁托槽合用时弹性比较  

DIFFERENT TYPES OF NICKEL-TITANIUM ORTHODONTIC ARCHWIRES COMBINED WITH DAMON SELF-LIGATING BRACKETS:A COMPARISON OF ELASTICITY

作　　者：伊吉翠 刘珺[1] 刘竹青[2] 杭晨[3] 孙娜[1] 苑子艺 

机构地区：[1]青岛大学附属医院口腔科,山东青岛266100 [2]青岛大学医学院松山医院 [3]聊城市人民医院

出　　处：《青岛大学医学院学报》2015年第5期559-562,共4页Acta Academiae Medicinae Qingdao Universitatis

摘　　要：目的在模拟口腔环境下比较不同种类镍钛弓丝与Damon自锁托槽合用时的弹性性能。方法使用万能材料力学试验机,对A组（包括A1亚组：0.356mm的含铜镍钛丝,A2亚组：0.356mm的热激活镍钛丝,A3亚组：0.356mm的超弹性镍钛丝）和B组（包括B1亚组：0.356mm×0.635mm的含铜镍钛丝,B2亚组：0.406mm的热激活镍钛丝,B3亚组：0.406mm的超弹性镍钛丝）共6种镍钛弓丝,在粘接有Damon 3 MX自锁托槽的改良牙模具上行弯曲试验,测试弓丝的弹性性能并进行比较。结果 6种镍钛弓丝均具有超弹性。A组中A1亚组的滞后值显著低于A3亚组（F=7.614,q=5.493,P〈0.01）,平台期应力值及平台期长度各亚组比较差异无显著性（F=1.670、2.619,P〉0.05）。B组中,B1亚组的滞后值显著高于B2亚组和B3亚组（F=25.714,q=8.150、9.302,P〈0.01）;平台期应力值B1亚组〉B3亚组〉B2亚组,差异有统计学意义（F=78.413,q=7.668～17.652,P〈0.01）;平台期长度3亚组比较差异无统计学意义（F=2.025,q=0.252～2.576,P〉0.05）。结论在模拟口腔环境下使用Damon自锁托槽时,0.356mm的热激活镍钛弓丝、含铜镍钛弓丝和0.406mm的热激活镍钛弓丝力量较柔和稳定,适合用于早期排齐。Objective In simulated oral environment,to compare elastic property of different nickel-titanium archwires when combined with Damon self-ligating brackets. Methods Universal material testing equipment was used to conduct a bending test in a modified dental mold to detect the elasticity of Damon self-ligating brackets（3MX,ormco,USA）and compared between group A（including subgroups A1：0.356 mm copper Ni-Ti wires,A2：0.356 mm heat-actived Ni-Ti wires,and A3：0.356 mm superelastic Ni-Ti wires）and group B（including subgroups B1：0.356mm×0.635 mm copper Ni-Ti wires,B2：0.406 mm heat-actived Ni-Ti wires,and B3：0.406 mm superelastic Ni-Ti wires）in six kinds of Ni-Ti archwires. Results Of the six types of Nickel-Titanium arch wires tested,all showed possesing hyperelasticity.In subgroup A1,the lagged value was lower than that in subgroup A3（F=7.614,q=5.493,P〈0.01）.There was no significant differences among the platform stress and the platform length（F=1.670,2.619;P〉0.05）.In subgroup B1,the lagged value was higher than that in subgroups B2 and B3（F=25.714;q=8.150,9.302;P〈0.01）.The platform stress values from largest to smallest were：B1〉B3〉B2（F=78.413,P〈0.01）（q=7.668-17.652,P〈0.01）.There was no significant differences among the three subgroups in platform length（F=2.025,q=0.252-2.576,P〉0.05）. Conclusion Under the simulated oral environment,when Damon self-ligating brackets are used,the strength of 0.356 mm heat-activated Ni-Ti wires（IMD）,0.356 mm copper Ni-Ti wires（ormco）and 0.406 mm heat-actived Ni-Ti wires is stable and gentle,being suitable for early alignment.

关 键 词：镍钛弓丝 正畸矫正器 弹性模量 

分 类 号：R783.5[医药卫生—口腔医学]