Soares Giulliana Panfiglio, Ambrosano Glaucia Maria Bovi, Lima Debora Alves Nunes Leite, Marchi Giselle Maria, Correr-Sobrinho Lourenço, Lovadino José Roberto, Aguiar Flávio Henrique Baggio
Department of Restorative Dentistry, Piracicaba Dental School-University of Campinas, Av. Limeira, 901, Piracicaba, São Paulo, Brazil, 13414-903.
Lasers Med Sci. 2014 Mar;29(2):545-50. doi: 10.1007/s10103-012-1244-7. Epub 2013 Jan 13.
This study evaluated the effect of polymerization mode and time and thermal and mechanical loading cycling (TMC) on microleakage in composite resin restorations. One hundred and eighty cavities were prepared and randomly divided according to the light curing time (20, 40, or 60 s), modes (quartz-tungsten-halogen (QTH)-420 mW/cm(2), LED 2 (2nd degree generation)-1,100 mW/cm(2), or LED 3 (3rd degree generation)-700 mW/cm(2)), and TMC. Following standard restorative procedures, the samples were prepared for analysis in an absorbance spectrophotometer. All results were statistically analyzed using the three-way ANOVA and Tukey test (p ≤ 0.05). The results revealed that the groups QTH and LED 3 submitted to TMC showed higher microleakage than those that were not submitted to TMC. Only for LED 3, 60 s showed higher microleakage than 20 s. For LED 2 and QTH, there were no differences between the times. QTH showed lower microleakage means than LED 2, when photoactivated for 20 s, without TMC. When photoactivated for 60 s, QTH showed lower microleakage means than LED 3, for the groups with or without TMC. It was concluded that TMC, the increase in polymerization time, and the irradiance were factors that may increase the marginal microleakage of class II cavities.
本研究评估了聚合模式、时间以及热机械加载循环（TMC）对复合树脂修复体微渗漏的影响。制备了180个窝洞，并根据光固化时间（20、40或60秒）、模式（石英钨卤素灯（QTH）-420 mW/cm²、第二代发光二极管（LED 2）-1100 mW/cm²或第三代发光二极管（LED 3）-700 mW/cm²）以及TMC进行随机分组。按照标准修复程序，将样本制备好用于在吸光分光光度计中进行分析。所有结果均使用三因素方差分析和Tukey检验进行统计学分析（p≤0.05）。结果显示，接受TMC的QTH组和LED 3组的微渗漏高于未接受TMC的组。仅对于LED 3，60秒时的微渗漏高于20秒时。对于LED 2和QTH，不同时间之间没有差异。在未进行TMC且光激活20秒时，QTH的微渗漏均值低于LED 2。在光激活60秒时，无论有无TMC，QTH组的微渗漏均值均低于LED 3组。得出的结论是，TMC、聚合时间的增加以及辐照度是可能增加Ⅱ类洞边缘微渗漏的因素。
