Antonson Sibel A, Yazici A Ruya, Okte Zeynep, Villalta Patricia, Antonson Donald E, Hardigan Patrick C
Department of Restorative Dentistry, University at Buffalo State University of New York School of Dental Medicine, Buffalo, NY, USA.
Eur J Dent. 2012 Oct;6(4):389-95.
To determine the relationship between margin preparation design and resin-composite type on microleakage with or without re-application of surface-penetrating sealant.
Class-I resin-composite restorations were completed for 128 extracted human molars. Half of the margins were beveled, the other half, butt-joint. Half of each group was restored with Filtek-Supreme (FS), the other half with Esthet-X (EX) using their respective adhesive systems. Margins were etched and sealed with a surface-penetrating sealant, Fortify. The samples were stored in water 24h, and thermocycled (5,000 cycles, 5°C-55°C). Then, samples were abraded using a toothbrush machine (6,000 strokes). Half of the restorations from each sealant group (n=16) were resealed, and the other half had no further treatment. Thermocycling and tooth brushing were repeated. The samples were sealed with nail polish, immersed in methylene-blue for 8h, sectioned, and magnified digital photographs were taken. Three examiners assessed dye penetration. A 2×2×2 multi-layered Chi-Square analysis, using Cochran-Mantel-Haenszel test was conducted for statistical analysis.
No difference was observed between sealed and resealed FS and EX restorations with butt-joint margins. In beveled margins, resealing caused significantly less microleakage (P<.01). No differences were found between restorations either sealed or resealed with bevel margins. In butt-joint margins, at the leakage level deeper than 2/3 of the preparation depth, resealed FS showed less microleakage than EX resealed restorations (P<.01).
Resealing reduced microleakage in bevel margins, however, in butt-joint margins resealing did not affect the leakage. A significant statistical relationship exists between and within resealing, margin preparation design, type of composite, and microleakage.
确定边缘预备设计和树脂复合材料类型与有无再次应用表面渗透封闭剂时微渗漏之间的关系。
对128颗拔除的人磨牙完成I类树脂复合材料修复。一半边缘为斜面，另一半为对接。每组的一半用Filtek-Supreme（FS）修复，另一半用Esthet-X（EX）并使用各自的粘结系统。边缘酸蚀并用表面渗透封闭剂Fortify密封。样本在水中储存24小时，然后进行热循环（5000次循环，5°C - 55°C）。然后，使用牙刷机对样本进行磨损（6000次刷动）。每个封闭剂组的一半修复体（n = 16）再次密封，另一半不进行进一步处理。重复热循环和牙刷磨损。样本用指甲油密封，浸入亚甲蓝中8小时，切片，并拍摄放大的数码照片。三名检查者评估染料渗透情况。使用Cochran-Mantel-Haenszel检验进行2×2×2多层卡方分析以进行统计分析。
对接边缘的FS和EX修复体在密封和再次密封之间未观察到差异。在斜面边缘，再次密封导致微渗漏显著减少（P <.01）。斜面边缘密封或再次密封的修复体之间未发现差异。在对接边缘，在渗漏深度超过预备深度的2/3时，再次密封的FS显示出比再次密封的EX修复体更少的微渗漏（P <.01）。
再次密封减少了斜面边缘的微渗漏，然而，在对接边缘再次密封并未影响渗漏。再次密封、边缘预备设计、复合材料类型和微渗漏之间以及内部存在显著的统计关系。
