Koohpeima Fatemeh, Sharafeddin Farahnaz, Jowkar Zahra, Ahmadzadeh Samaneh, Mokhtari Mohammad Javad, Azarian Babak
Department of Operative Dentistry, Biomaterials Research Center, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Islamic Republic of Iran.
Professor, Department of Operative Dentistry, Biomaterials Research Center, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Islamic Republic of Iran, Phone: 36263193 e-mail:
J Contemp Dent Pract. 2016 Mar 1;17(3):240-7. doi: 10.5005/jp-journals-10024-1834.
This study investigated the effect of TiF4 solution pretreat-ment on microleakage of silorane and nanofilled methacrylate-based composites in class V cavities.
Forty-eight intact premolar teeth were randomly allocated to four groups of 12 teeth. Restorative techniques after standard class V tooth preparations were as follows: Group 1, Filtek P90 composite; group 2, Filtek Z350 XT; group 3, TiF4 solution pretreatment and Filtek P90 composite; group 4, TiF4 solution pretreatment and Filtek Z350 XT. After storing the specimens in distilled water at 37°C for 24 hours and followed by immersion of the specimens in a 0.5% basic-fuchsin solution for 24 hours, they were sectioned buccolingually to obtain four surfaces for each specimen for analysis of microleakage using a stereomicroscope. Data analysis was performed using Kruskal-Wallis test to compare the four groups and the Mann-Whitney test for paired comparisons with Statistical Package for the Social Sciences (SPSS) version 17 software.
At the enamel margins, microleakage score of the Filtek Z350 XT group was lower than those of the Filtek P90 with and without the application of the TiF4 (p = 0.009 and p = 0.031 respectively). At the dentin margins, groups 3 and 4 (TiF4+Filtek P90 and TiF4+Filtek z350 XT respectively) showed significantly lower microleakage than group 1 (Filtek P90). However, there was no significant difference between other groups (p > 0.05).
At the enamel margins, microleakage score of the silorane-based composite was more than that of the nanofilled composite. No significant differences were observed between the other groups. At the dentin margins, for the silorane-based composite restorations, TiF4 solution pretreatment resulted in significantly lower microleakage. However, the similar result was not observed for Filtek Z350 XT. Also, no significant difference was observed between microleakage scores of Filtek P90 and Filtek Z350 XT with or without TiF4 pretreatment.
In spite of better mechanical and physical properties of modern composites than earlier methacrylate-based composites, polymerization shrinkage has been remaining as one of the main shortcomings of them. Different methods, such as using new low shrinkage resin composites and different dentin pretreatments, have been suggested to overcome this problem. This study evaluated the effect of TiF4 as pretreatment on microleakage of class V tooth preparations restored with a nanocomposite and a silorane-based resin composite.
本研究调查了四氟化钛（TiF4）溶液预处理对Ⅴ类洞型中硅烷类和纳米填充甲基丙烯酸酯基复合树脂微渗漏的影响。
将48颗完整的前磨牙随机分为4组，每组12颗。Ⅴ类洞标准备洞后的修复技术如下：第1组，Filtek P90复合树脂；第2组，Filtek Z350 XT；第3组，TiF4溶液预处理后用Filtek P90复合树脂；第4组，TiF4溶液预处理后用Filtek Z350 XT。将标本在37℃蒸馏水中储存24小时，然后将标本浸入0.5%碱性品红溶液中24小时，之后沿颊舌方向切片，每个标本获得四个表面，用体视显微镜分析微渗漏情况。使用Kruskal-Wallis检验对四组进行比较，并使用社会科学统计软件包（SPSS）17版软件进行配对比较的Mann-Whitney检验进行数据分析。
在釉质边缘，Filtek Z350 XT组的微渗漏评分低于使用和未使用TiF4的Filtek P90组（分别为p = 0.009和p = 0.031）。在牙本质边缘，第3组和第4组（分别为TiF4 + Filtek P90和TiF4 + Filtek Z350 XT）的微渗漏明显低于第1组（Filtek P90）。然而，其他组之间无显著差异（p > 0.05）。
在釉质边缘，硅烷类复合树脂的微渗漏评分高于纳米填充复合树脂。其他组之间未观察到显著差异。在牙本质边缘，对于硅烷类复合树脂修复体，TiF4溶液预处理导致微渗漏显著降低。然而，Filtek Z350 XT未观察到类似结果。此外，无论是否进行TiF4预处理，Filtek P90和Filtek Z350 XT的微渗漏评分之间均未观察到显著差异。
尽管现代复合树脂的机械和物理性能优于早期的甲基丙烯酸酯基复合树脂，但聚合收缩仍是其主要缺点之一。已提出不同方法来克服这一问题，如使用新型低收缩树脂复合材料和不同的牙本质预处理方法。本研究评估了TiF4作为预处理对用纳米复合树脂和硅烷类树脂复合树脂修复的Ⅴ类洞型微渗漏的影响。
