干燥、湿润环境对光固化复合树脂聚合收缩影响的实验研究  

The effect of dry and wet environment on the resin composite polymerization shrinkage

作　　者：曹立群[1] 赵守亮[1] 杨国标[2] 倪凡[2] 

机构地区：[1]同济大学附属口腔医学院 [2]同济大学航空与力学学院

出　　处：《牙体牙髓牙周病学杂志》2013年第5期338-343,348,共7页Chinese Journal of Conservative Dentistry

摘　　要：目的:测试干燥、湿润环境对3种光固化复合树脂聚合收缩的影响。方法:取18个新鲜拔除的下颌第三磨牙,制备近中邻(MO)洞,洞宽为颊舌牙尖距的1/3,洞深为2 mm,然后分别用GRADIA DI-RECT-P、Z350和P90树脂充填窝洞(P90用其自带粘结剂,其余均用G-BOND粘结剂处理洞壁)(n=6),并随机分成干燥组和湿润组(n=3)。在650 mW/cm2光源下,光照固化40 s后采用电子散斑干涉技术测量树脂修复体的面、近中邻面收缩和牙齿颊面的变形情况。结果:3种树脂中GRADIA DIRECT-P的收缩量和牙齿变形量最大,P90的收缩量和牙齿变形量最小;湿润环境可降低树脂修复体聚合收缩量和牙齿的变形量。结论:环境对光固化树脂的聚合收缩有一定影响,湿润环境下,其聚合收缩明显减小。AIM： To study the effect of dry and wet environment on the polymerization shrinkage of three dental resin composites . MEHTODS： 18 freshly extracted human mandibular third molars were collected, MO cavities with the width of 1/3 of buecolingual cusp distance and depth of 2 mm were prepared on the molars. Cavities were treated with G-BOND bonding system except for P90 with its own bonding system, then three commercially available dental resin composites GRADIA DIRECT-P, Z350 and P90 were used to fill the cavities respectively（ n = 6 ）. The teeth were then divided into wet and dry groups randomly（ n = 3 ）. The shrinkages of the composites and the deformation of the teeth were measured by electronic speckle pattern interferometry （ESPI） immediately after light cure for 40 s under the 650mW/cm2. RESULTS ： Among the three dental resin composites, GRADIA DIRECT-P showed the largest polymerization shrinkage and tooth deformation, while P90 showed the minimum. The polymerization shrinkage in the moist environment was less than that under dry condition. CONCLUSION： The environment has a certain impact on the polymerization shrinkage of the dental resin composite. In wet environment, the polymerization shrinkage is less.

关 键 词：复合树脂 固化收缩 电子散斑干涉技术 环境 

分 类 号：R783.1[医药卫生—口腔医学]