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首页> 外文期刊>The Journal of Prosthetic Dentistry >Effect of finishing time and techniques on marginal sealing ability of two composite restorative materials.
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Effect of finishing time and techniques on marginal sealing ability of two composite restorative materials.

机译：整理时间和工艺对两种复合修复材料的边缘密封能力的影响。

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Statement of Problem. Finishing of composites may adversely influence the sealing ability of direct adhesive restorations. Purpose. This study was conducted to determine whether finishing time and techniques under wet or dry conditions affect the microleakage of 2 types of class V composite restorations. Material and Methods. Eighty class V preparations were made in the buccal surfaces of noncarious molars with the occlusal margins ending in enamel and the gingival margins in dentin. Dental adhesive (Single Bond) was applied according to the manufacturer's instructions. Half of the preparations were restored with a microfilled composite (Silux Plus) and the other half with a hybrid composite (Filtek Z250). Within each major composite group (n = 40), 4 subgroups (n = 10) were established based on finishing technique (diamond finishing burs or aluminum oxide discs) and finishing time (immediate or delayed by 24 hours). The specimens were stored for 24 hours in 37 degrees C water, thermocycled for 250 cycles between 5 degrees C and 55 degrees C, immersed in 2% methylene blue solution for another 24 hours, and sectioned longitudinally. For both enamel and dentin margins, dye solution penetration at the tooth/composite interface was scored from 0 to 4 under stereoscopy at original magnification x 20. Data were analyzed with the Kruskal-Wallis test (P<.05). Results. Significantly lower leakage scores were recorded for teeth restored with microfilled composite and finished under wet conditions after 24 hours (P<.01). No significant differences were found among the hybrid composite groups. Conclusion. For microfilled composite restorations on dentin margins, delayed wet finishing with diamond burs resulted in significantly lower microleakage scores than all other finishing protocols. Hybrid composite restorations had equivalent levels of microleakage regardless of the finishing method.
机译：问题陈述。复合材料的表面处理可能会对直接粘合修复剂的密封能力产生不利影响。目的。进行这项研究以确定在湿或干条件下的修整时间和技术是否会影响2种V类复合修复体的微渗漏。材料与方法。在非龋性磨牙的颊面制备八十种V类制剂，其咬合边缘以牙釉质结尾，牙龈边缘以牙本质结尾。根据制造商的说明使用牙科粘合剂（单键）。用微填充复合材料（Silux Plus）恢复一半制剂，用混合复合材料（Filtek Z250）恢复另一半制剂。在每个主要的复合材料组（n = 40）中，根据精加工技术（金刚石精加工针或氧化铝盘）和精加工时间（立即或延迟24小时）建立了4个亚组（n = 10）。将样品在37摄氏度的水中储存24小时，在5摄氏度和55摄氏度之间进行250个循环的热循环，再在2％的亚甲基蓝溶液中浸泡24小时，然后纵向切片。对于牙釉质和牙本质边缘，在立体放大倍数下，原始放大倍数为20时，在牙齿/复合物界面的染料溶液渗透度为0到4。数据用Kruskal-Wallis检验进行分析（P <0.05）。结果。使用微填充复合材料修复并在24小时后在潮湿条件下修整的牙齿，记录到的泄漏分数明显较低（P <.01）。在混合复合材料组之间没有发现显着差异。结论。对于在牙本质边缘的微填充复合修复体，延迟使用金刚石钻头进行的湿法精加工比所有其他精加工方案所导致的微渗漏评分显着降低。无论采用何种修整方法，混合复合修复体的渗漏程度均相同。

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