Hoseinifar Razieh, Mofidi Maryam, Malekhosseini Nima
Oral and Dental Diseases Research Center, Dept. of Operative Dentistry, School of Dentistry, Kerman University of Medical Sciences, Kerman, Iran.
Dept. of Operative Dentistry, School of Dentistry, Kerman University of Medical Sciences, Kerman, Iran.
J Dent (Shiraz). 2020 Jun;21(2):87-94. doi: 10.30476/DENTJODS.2019.77861.0.
Bulk fill composites have been introduced over the recent years in order to accelerate the process of tooth restoration by inserting composite in bulk up to 4mm thickness. Occlusal loading may influence the gingival microleakage of this composite.
This study aims to evaluate the effect of occlusal loading on the gingival microleakage of bulk fill composites compared with a conventional composite.
In this experimental study, box only class II cavities with gingival margins placed 1mm below the cemento-enamel junction were prepared on the mesial and distal surfaces of 36 maxillary premolars (72 cavities). The samples were divided into three groups and restored as follows: Group 1 (Tetric N-Ceram, incremental filling), Group 2 (X-tra fill, bulk filling), Group 3 (Tetric N-Ceram Bulk Fill, bulk filling). All restorations were thermocycled for 2000 cycles (5-50̊C) and then half of the samples were subjected to 200,000 cycles of loading. All the specimens were immersed in 0.5% basic fuchsin for 48 hours, then, sectioned, and evaluated for microleakage with a stereomicroscope. Data were analyzed using Kruskal-Wallis and Mann-Whitney U-tests. < 0.05 was considered significant.
There were no significant differences among the gingival microleakage of three composites in both unloaded and loaded groups. In addition, no statistically significant difference was found between the microleakage of unloaded and loaded groups in all materials.
Occlusal loading did not affect the gingival microleakage of bulk fill composites, and the microleakage of class II cavities restored with the bulk filling technique was similar to that of restored with the incremental technique.
近年来，为了通过一次性填入厚度达4毫米的复合材料来加速牙齿修复过程，大体积填充复合材料应运而生。咬合负荷可能会影响这种复合材料的牙龈微渗漏。
本研究旨在评估与传统复合材料相比，咬合负荷对大体积填充复合材料牙龈微渗漏的影响。
在这项实验研究中，在36颗上颌前磨牙的近中面和远中面制备仅带有箱状的II类洞，龈缘位于牙骨质-釉质界下方1毫米处（72个洞）。将样本分为三组并按以下方式进行修复：第1组（Tetric N-Ceram，分层填充），第2组（X-tra fill，大体积填充），第3组（Tetric N-Ceram Bulk Fill，大体积填充）。所有修复体进行2000次循环（5-50̊C）的热循环，然后将一半样本进行200,000次循环的负荷加载。所有标本浸入0.5%碱性品红中48小时，然后切片，并用体视显微镜评估微渗漏情况。使用Kruskal-Wallis和Mann-Whitney U检验分析数据。P < 0.05被认为具有显著性。
在未加载组和加载组中，三种复合材料的牙龈微渗漏之间均无显著差异。此外，在所有材料中，未加载组和加载组的微渗漏之间也未发现统计学上的显著差异。
咬合负荷不会影响大体积填充复合材料的牙龈微渗漏，采用大体积填充技术修复的II类洞的微渗漏与采用分层技术修复的相似。
