缩醛树脂卡环形变的体外实验研究  

Study on deformation of acetal resin clasp in vitro

作　　者：廖岚[1] 王军[2] 欧阳少波[1] 朱洪水[1] 

机构地区：[1]南昌大学附属口腔医院,南昌330006 [2]南昌大学第二附属医院

出　　处：《山东医药》2011年第40期61-62,68,共3页Shandong Medical Journal

基　　金：江西省科技厅支撑计划课题(2009ZDS13800)

摘　　要：目的观察缩醛树脂(POM)卡环在反复脱位循环过程中形变的变化趋势。方法使用Instron电子万能材料试验机和电子数显卡测试钴铬合金卡环和临床常用POM—钴铬合金联合三臂卡环在不同材质(热凝塑料牙、离体牙、钴铬合金牙)前磨牙上2 880次脱位循环前后,卡环固位臂卡环尖和抗力臂卡环尖之间的距离变化值,以及POM—钴铬合金联合三臂卡环固位臂厚度的变化值。结果 2 880次循环周期后,钴铬合金卡环的固位臂卡环尖和抗力臂卡环尖之间的距离增加(P<0.01),而POM卡环的固位臂卡环尖和抗力臂卡环尖之间的距离无明显变化(P>0.05);在不同材质基牙上,POM卡环臂厚度均呈衰减趋势,塑料牙组卡环臂的厚度测定值分别高于离体牙组和钴铬合金牙组(P均<0.05)。结论 POM卡环形变低于铸造合金卡环;不同基牙材质对POM卡环形变量的影响存在差异。Objective To observe the tendency of tlefiulnatinn of aeetal resin clasps during the repeated eye.les of plaeement and removal. Methods The Co-Cr elasps anal the acetal resin-Cn-Cr clasps used in eliuie were tested by instron electrnnic universal testing machine and eleetrnnie digital display. To measure the change of distauee between the retention clasps anal resistance elasps, and the change of thickness of the aeetal resin-Co-Cr elasps on premolar of different material （heat curing resin teeth, extraeted teeth, enhalt-ehromium alloy teeth） hefon and after 2 880 （tish）catinn cycles. Results After 2 880 dislocation cycles, there was significant increase in the distannce between the tips of Co-Cr elasps （P 〈0.01 ） , hut not for the aeetal resin clasps （P 〉 0.05 ）. On the tooth of different material, the thickness of aeetal resin clasps all showed tendency of attenuation, the thickness of clasps on heat curing resin teeth was significantly higher than the other two types （P 〈0.05）. Conclusions The deformation of acetal resin elasp was lower than casting clasp. There were signifitant differences among the deformatiou of aeetal resin elasp on various material teeth.

关 键 词：缩醛树脂 牙科卡环 形变 体外研究 

分 类 号：R783.4[医药卫生—口腔医学]