The interference of eugenol on the adhesive systems and composite polymerization could promote a higher marginal microleakage. This could be reduced by mechanical and chemical cleansing. The objective of this study was to evaluate the influence of the previous use of eugenol-based materials to a permanent restoration on the marginal microleakage. The influence of mechanical cleansing associated with chemical cleansing with chlorhexidine gel was also evaluated. Non-eugenol endodontic sealer and temporary material and mechanical cleansing was used as a control. Eighty bovine incisors were endodontic treated and divided into eight groups (n = 10) according to the sealer, temporary material and removal method. The specimens were temporarily restored and stored for 1 week at 37 °C and 100 % relative humidity, followed by definitive restoration and one-year storage at the same environment. The teeth were then sealed, immersed in silver nitrate at 50 % for 2 h and sectioned to have the microleakage qualitatively and quantitatively visually analyzed under a stereomicroscope at 45×. The percentage data were submitted to an ANOVA and Tukey’s test, and the scores were submitted to a Kruskal–Wallis and Dunn’s test at 5 % of the significance level. There was no difference between the groups when mechanical removal was made (p > 0.05). When chlorhexidine was used, the group that used endodontic eugenol based material as a sealer and the resin-based material as a temporary restoration showed less microleakage than the other (p < 0.05). All groups showed less microleakage when chlorhexidine was used instead of solely using mechanical removal (p < 0.05). For scores, when the eugenol based sealer was combined with resin-based temporary material, and when the resin sealer was combined with eugenol based temporary material using chlorhexidine, a lower median was found (p < 0.05) compared to all other groups. Eugenol showed no influence, and chlorhexidine gel showed to be effective in reducing microleakage.

中文翻译：

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以前以丁香酚为基础的材料和清洁程序对树脂复合材料恢复一年储存后微渗漏的影响

丁香酚对胶粘剂体系和复合聚合的干扰可促进较高的边缘微渗漏。可以通过机械和化学清洗减少这种情况。这项研究的目的是评估以前使用丁香酚基材料对边缘微渗漏的永久修复的影响。还评估了用氯己定凝胶进行机械清洁与化学清洁相关的影响。对照使用非丁香酚根管封闭剂和临时材料及机械清洁。对80头牛切牙进行了牙髓治疗，根据封闭剂，临时材料和去除方法将其分为8组（n = 10）。暂时恢复标本并在37°C和100％相对湿度下保存1周，然后在相同的环境中进行确定的还原和一年的存储。然后将牙齿密封，将其浸入50％的硝酸银中2 h，然后切片以在45x立体显微镜下定性和定量目测显微渗漏。将百分比数据提交给方差分析和Tukey检验，将分数提交给Kruskal-Wallis和Dunn检验，其显着性水平为5％。进行机械切除时，两组之间无差异（p> 0.05）。当使用洗必太时，使用牙髓性丁香酚基材料作为封闭剂和树脂基材料作为临时修复物的组显示出比其他组少的微渗漏（p <0.05）。当使用洗必泰而不是单独使用机械去除时，所有组的微渗漏均较少（p <0.05）。对于分数，将丁香酚基密封剂与基于树脂的临时材料组合使用，以及当将树脂密封剂与基于氯己定的丁香酚基于临时材料组合使用时，与所有其他组相比，发现中位数较低（p <0.05）。丁子香酚没有影响，洗必泰凝胶对减少微渗漏有效。