Assis Claudine Pereira, Moyses Marcos Ribeiro, Teixeira Hercilia Marburg, Ribeiro Jose Carlos Rabelo, Ribeiro Joao Gustavo Rabelo, Dias Sergio Candido
Department of Restorative Dentistry, Dental School of Tres Coracoes, Vale do Rio Verde University, UNINCOR, MG, Brazil.
Gen Dent. 2009 Sep-Oct;57(5):485-9; quiz 490-1, 535-6.
This laboratory study compared the flexural endurance limits of clinical combinations of dental composite with and without glass ionomer cement (GIC) liners. Using only composite (Filtek Z350), specimens (10 mm long x 2 mm wide x 2 mm thick) in the control group were produced. Two GICs (Vitremer and Vitrebond) were used with the composite to prepare the test groups. Flexural strength and flexural fatigue limit (FFL) tests were performed. The FFL was determined using the staircase method. Data were analyzed by one-way ANOVA and Tukey's test. There was a significant difference in flexural strength values between the composite-only specimens and those produced by composite and GIC (p < 0.05). No statistical difference was observed in the flexural strength values between composite with Vitremer and composite with Vitrebond (p < 0.05). No statistically significant differences were detected in FFL values between composite with Vitremer and composite with Vitrebond; in addition, the mean value of the composite-only specimens differed statistically from those of both composite with Vitremer and composite with Vitrebond (p < 0.05). The FFL was lower than the flexural strength, indicating a decrease in flexural strength of 45 to 50%. Using GICs with composite decreased the mechanical properties (FFL and flexural strength) of the composite.
这项实验室研究比较了有和没有玻璃离子水门汀（GIC）衬层的牙科复合材料临床组合的抗弯耐力极限。对照组仅使用复合材料（Filtek Z350）制作样本（长10毫米×宽2毫米×厚2毫米）。两种GIC（Vitremer和Vitrebond）与复合材料一起用于制备测试组。进行了抗弯强度和弯曲疲劳极限（FFL）测试。FFL采用阶梯法测定。数据通过单因素方差分析和Tukey检验进行分析。仅使用复合材料的样本与使用复合材料和GIC制作的样本之间的抗弯强度值存在显著差异（p<0.05）。Vitremer复合材料和Vitrebond复合材料的抗弯强度值之间未观察到统计学差异（p<0.05）。Vitremer复合材料和Vitrebond复合材料的FFL值之间未检测到统计学显著差异；此外，仅使用复合材料的样本的平均值与Vitremer复合材料和Vitrebond复合材料的样本的平均值在统计学上存在差异（p<0.05）。FFL低于抗弯强度，表明抗弯强度降低了45%至50%。将GIC与复合材料一起使用会降低复合材料的机械性能（FFL和抗弯强度）。
