Magni Elisa, Zhang Ling, Hickel Reinhard, Bossù Maurizio, Polimeni Antonella, Ferrari Marco
Department of Fixed Prosthodontics and Dental Materials, University of Siena, Policlinico "Le Scotte", Viale Bracci, 53100 Siena, Italy.
J Dent. 2008 Nov;36(11):885-91. doi: 10.1016/j.jdent.2008.07.003. Epub 2008 Aug 30.
To evaluate the marginal integrity of class V restorations through an SEM observation and a microleakage test.
Teeth with class V cavities were restored with either a flowable composite (n=20) or a glass ionomer cement (GIC) (n=20). Ten restorations in each group were immediately polished. A coating agent was applied on five polished and five non-polished restorations of each group. No coating was used on the remaining specimens. Epoxy resin replicas of the restorations were observed under a SEM and the percentage of marginal gaps was calculated. After immersion in a 2% methylene blue solution, three sections were obtained from each specimen and observed under a stereomicroscope. Occlusal and gingival microleakage were evaluated with a four-steps scoring system. The percentages of marginal gaps and the microleakage scores were analyzed with the Kruskal-Wallis ANOVA and the Mann-Whitney test with Bonferroni's correction. Occlusal and gingival microleakage were compared with the Wilcoxon test.
No gaps were detected after coating. The restorative materials did not differ in interfacial gaps. Immediate polishing increased the gaps of uncoated restorations (p<0.05). The microleakage decreased with coating, except for occlusal wall of polished flowable composite restorations. After coating, the occlusal microleakage was higher than the gingival (p<0.05), except for non-polished flowable composite restorations. After polishing and coating, the flowable composite showed higher occlusal microleakage than the GIC. The polishing increased the occlusal microleakage of coated flowable composite restorations.
The coating procedure is advisable for restoring marginal integrity and reducing gingival microleakage in class V restorations.
通过扫描电子显微镜（SEM）观察和微渗漏试验评估Ⅴ类洞修复体的边缘完整性。
Ⅴ类洞型的牙齿分别用流动复合树脂（n = 20）或玻璃离子水门汀（GIC）（n = 20）进行修复。每组中10个修复体立即进行抛光。在每组5个抛光和5个未抛光的修复体上应用一种涂层剂。其余标本不使用涂层。在扫描电子显微镜下观察修复体的环氧树脂复制品，并计算边缘间隙的百分比。将标本浸入2%亚甲蓝溶液后，从每个标本上获取三个切片，并在体视显微镜下观察。用四步评分系统评估咬合面和牙龈的微渗漏情况。用Kruskal-Wallis方差分析和经Bonferroni校正的Mann-Whitney检验分析边缘间隙百分比和微渗漏评分。用Wilcoxon检验比较咬合面和牙龈的微渗漏情况。
涂层后未检测到间隙。修复材料在界面间隙方面没有差异。立即抛光增加了未涂层修复体的间隙（p<0.05）。除了抛光的流动复合树脂修复体的咬合壁外，微渗漏随涂层而减少。涂层后，除了未抛光的流动复合树脂修复体，咬合面微渗漏高于牙龈微渗漏（p<0.05）。抛光和涂层后，流动复合树脂的咬合面微渗漏高于玻璃离子水门汀。抛光增加了涂层流动复合树脂修复体的咬合面微渗漏。
涂层程序对于恢复Ⅴ类洞修复体的边缘完整性和减少牙龈微渗漏是可取的。
