流动性复合树脂核材料在短时超高光强照射下的聚合效果  

Polymerization of flowable composite core materials irradiated by super-high intensity light with short time

作　　者：何少伟[1] 耿藤瑜 孟翔峰[1] 

机构地区：[1]南京市口腔医院.南京大学医学院附属口腔医院修复科,江苏南京210008

出　　处：《上海口腔医学》2016年第3期261-265,共5页Shanghai Journal of Stomatology

基　　金：国家自然科学基金(81470781);江苏省自然科学基金(BK20141082);南京市医学科技发展项目(YKK2125)

摘　　要：目的 :评估流动性双重固化复合树脂核材料在短时超高强度照射下的聚合效果。方法 :将双重固化流动性复合树脂核材料(regular dentine,Para core)注满单端开口的长方体形不透光硅橡胶模具中,将光固化灯紧贴开口端,以1000 m W/cm^2持续照射10、20 s或以3200 m W/cm^2持续照射3、6 s。试件避光保存1 h后取出,测量试件纵断面距照射光源1~10 mm间,以1 mm为间隔共10个深度的努氏显微硬度以判断聚合效果。试件继续避光保存24 h后,重复上述测量。采用SPSS 16.0软件包对数据进行统计学分析。结果:除3200 m W/cm^2、3 s光照射条件无法引发光固化反应外,在其余光照射条件下,试件在光影响深度内的硬度值在光照后24 h都显著高于单纯化学固化产生的硬度值,但光照射对试件的影响深度有限。在试件的光影响深度内,随着光照射时间的延长,试件的硬度值得到显著提高;而试件在3200 m W/cm^2、6 s和1000 m W/cm^2、20 s条件下光照射后24 h的硬度值无显著差异。结论:3200 m W/cm^2光强度照射时间必须延长到6 s,才能保证引发流动性复合树脂核材料的光固化反应,并获得合适的聚合效果。PURPOSE： To evaluate the polymerization of dual-cured flowable composite core irradiated by super-high intensity light with short time. METHODS： The light-proof silicon rubber cuboid mold with one end open was syringed and filled by dual-cured flowable resin composite core, then the open end of mold was irradiated directly by a light unit at 1000 m W/cm^2×10, ×20 s; or at 3200 m W/cm^2× 3, ×6 s. The specimens were stored in the light-proof box. After irradiation for 1 h and 24 h, Knoop microhardness was measured along the vertical surfaces of specimens from 1mm to 10 mm depth at 1mm interval. The data was analyzed by one-way ANOVA with SPSS 16.0 software package. RESULTS： 3200 m W/cm^2×3 s light irradiation did not initiate light curing of the specimens. The other three light irradiations could make specimens obtaining higher microhardness than that by pure chemical cure; however, the depth of specimens affected by light irradiation was limited. Within the area affected by light, the microhardness of specimens could be improved by increasing the light irradiation time; after irradiation for 24 h, the microhardness of specimens had no difference between 3200 m W/cm^2×6 s and 1000 m W/cm^2×20 s light irradiation. CONCLUSIONS： 3200 m W/cm^2 light intensity should be used for irradiation at least for 6 s, which could initiate light curing of flowable composite core to sufficient polymerization.

关 键 词：光强度 照射时间 流动性 复合树脂核 显微硬度 

分 类 号：R783.1[医药卫生—口腔医学]