家庭漂白剂对复合树脂表面粗糙度、显微硬度的影响

目的:评价10%过氧化脲家庭漂白剂对直接和间接复合树脂材料表面粗糙度和显微硬度的影响。方法:实验选用2种直接复合树脂材料(Filtek Z350,Clearfil Majesty Esthetic)和2种间接复合树脂材料(Ceramage,Adoro SR)。每种树脂材料在粗糙度和显微硬度试验中分别制作20个盘形试样(直径10 mm、厚1.0 mm),随机分为10%过氧化脲漂白组和去离子水对照组(n=10)。漂白凝胶处理漂白组试样每天使用8 h,共2周。测量树脂试样漂白处理前、后表面粗糙度和显微硬度值。结果:10%过氧化脲漂白剂处理前后,树脂材料表面粗糙度变化无统计学差异(除外Clearfil Majesty Esthetic)。4种树脂材料漂白前后试样的显微硬度值变化不大,且没有统计学差异。结论:10%过氧化脲漂白剂没有改变树脂材料的显微硬度,但树脂材料表面粗糙度的改变取决于树脂材料的类型。

Effects of 10% Carbamide Peroxide Bleaching Agent on the Surface Roughness and Microhardness of Direct and Indirect Composite Resins

Objective: To analyze the effects of 10% carbamide peroxide at-home bleaching agents on the surface roughness and microhardness of direct and indirect composite resins. Methods: Four composite resin materials, i.e. two direct composite resins (Filtek Z350, Clearfil Majesty Ethetic) and two indirect composite resins (Ceramage, Adoro SR), were tested in our study. Twenty disk-shaped specimens (10mm in diameter and 1.0mm in thickness) for each resin material were prepared and randomly divided into two groups: 10% carbamide peroxide group and deionized water group (control group). The 10% carbamide peroxide agent was applied 8 hours daily during 14 days. The control specimens were immersed in deionized water throughout the experiment. Surface roughness and microhardness were measured before and after bleaching treatment. The data were analyzed using t test. Results: For exposure to 10% carbamide peroxide agent, only the Clearfil Majesty Esthetic composites resin presented a rougher surface after bleaching treatment (P<0.001). Microhardness of composite resins was not different throughout the 14-day period, regardless of the surface treatment. Conclusion: The application of 10% carbamide peroxide did not alter the microhardness of all tested composite resins. The surface microhardness was material-dependent.