温度循环老化实验对不同复合树脂抛光面粗糙度的影响  

Comparative study of the surface roughness of different composite resins before and after thermal aging process

作　　者：蒋红[1] 吕达[1] 刘开蕾[1] 姚瑶[1] 张伟生[1] 廖楚宏 

机构地区：[1]北京大学深圳医院口腔科,广东深圳518036 [2]深圳大学化学与化工学院,广东深圳518052

出　　处：《临床口腔医学杂志》2014年第8期463-465,共3页Journal of Clinical Stomatology

基　　金：深圳市科技计划资助项目(201202013)

摘　　要：目的:比较临床常用的复合树脂(AP-X,Z250,Z350),在温度循环老化实验后抛光面粗糙度变化。方法:3种复合树脂(AP-X、Z250和Z350)制备8 mm×8 mm×4 mm样块,用3M Sof-Lex抛光彩碟研磨和抛光,经水浸泡及5/55℃冷热循环10000及20000次后,测量比较复合树脂样块的表面粗糙值(Ra)变化。结果:10000次温度循环后,Z250的Ra值由基线(0.173±0.035)μm下降至(0.158±0.045)μm(P=0.020)。20000次循环后,Z250的Ra值进一步下降至(0.141±0.034)μm与基线比差异有统计学意义(P<0.001);AP-X和Z350的Ra值亦有下降趋势,差异无统计学意义(P>0.05)。结论:复合树脂经温度循环后可能出现二次被动抛光现象。Objective：To evaluate the effect of thermal aging process on surface roughness of several different dental composite resins.Method：Three types of composite resins （AP-X,Z250 and Z350） were fabricated as 8 mm × 8 mm ×4 mm cubical specimens.The surfaces were polished with abrasive disks （3M Sof-Lex）.Profilometer was used to test the mean surface roughness （Ra） before and after an aging process （5 /55 ℃ thermal cycles for 10000 and 20000 times）.Result：After 10000 cycles,the Ra of Z250 dropped form （0.173±-0.035）μm to （0.158±0.045）μm （P =0.020）.After 20000 cycles,the Ra of Z250 proceeded to drop to （0.141±0.034） μm （comparing to baseline,P ＜0.001）.Same tendency of Ra decreasing were detected also in AP-X and Z350.Conclusion：Composite resins might experience a process of positive secondary polishing.

关 键 词：复合树脂 抛光 粗糙度 老化 

分 类 号：R781.05[医药卫生—口腔医学]