冷热循环老化对不同光固化复合树脂表面微结构的影响  

Effect of thermal cycling on surface microstructure of different light-curing composite resins

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

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：《南方医科大学学报》2015年第4期615-618,共4页Journal of Southern Medical University

基　　金：深圳市科技计划资助项目(201202013;201303043)

摘　　要：目的比较几种树脂冷热循环老化后表面形态的改变。方法 1种纳米树脂(Z350)和4种微混合填料树脂(P60、Z250、Spectrum、AP-X),以侧壁至中心分层填压固化法制备样块,研磨和抛光侧壁,经水浸泡及5/55℃冷热循环40 000次后,分析抛光侧壁表面粗糙值(Ra)的变化,观察扫描电镜下的微结构变化。结果经冷热循环后,抛光面Ra值呈下降趋势。其中Spectrum由0.164±0.024μm降至0.140±0.017μm(P<0.001),Z250由0.169±0.035μm降至0.144±0.033μm(P<0.001),Ra值接近抛光性能较好的P60(0.121±0.028μm)。扫描电镜下,5种树脂划痕与凹陷变浅,但Z350样块表面出现裂纹。结论水浸泡及冷热循环可能对复合树脂产生抛光效应,但也可能导致纳米树脂表面产生裂纹。Objective To evaluate the effect of thermal cycling on surface microstructure of different light-curing composite resins. Methods A nanofilled composite （Z350） and 4 microhybrid composites （P60, Z250, Spectrum, and AP-X） were fabricated from lateral to center to form cubic specimens. The lateral surfaces were abrased and polished before water storage and 40 000 thermal cycles （5/55℃）. The mean surface roughness （Ra） were measured and compared before and after thermal cycling, and the changes of microstructure were observed under scanning electron microscope （SEM）. Results Significant decreases of Ra were observed in the composites, especially in Spectrum （from 0.164±0.024μm to 0.140±0.017μm, P〈0.001） and Z250 （from 0.169 ± 0.035μm to 0.144 ± 0.033μm, P〈0.001）, whose Ra approximated that of P60 （0.121 ± 0.028μm） with smoothly polished surface. SEM revealed scratches and shallower pits on the surface of all the 5 resins, and fissures occurred on Z350 following the thermal cycling. Conclusions Water storage and thermal cycling may produce polishing effect on composite resins and cause fissures on nanofilled composite resins.

关 键 词：复合树脂 抛光 粗糙度 老化 

分 类 号：R783.1[医药卫生—口腔医学]