Lopes Murilo Baena, Costa Leticia A, Consani Simonides, Gonini Alcides Junior, Sinhoreti Mario A C
Department of Restorative Dentistry, University of North Parana, Londrina, Brazil.
Indian J Dent Res. 2009 Oct-Dec;20(4):394-9. doi: 10.4103/0970-9290.59428.
This in vitro study evaluates the influence of marginal sealing methods in composite restorations with different adhesive systems submitted to mechanical load.
Eighty bovine incisor crowns were embedded in Polyvinyl chloride (PVC) molds with the buccal surface exposed, where cavities (4mm x 4mm x 3mm) were made. Samples had the adhesive systems, Single Bond or Clearfil SE Bond, applied according to the manufacturer's recommendations. The cavities were filled with a Z-250 composite according to the restoration technique (bulk filling or three increments) and photoactivation (conventional, soft start, pulsatile light or light-emitting diode [LED]). The samples were duplicated with epoxy resin for scanning electron microscopy observations. Samples were also submitted to mechanical load (200,000 cycles; 2 Hz) and new replicas were made.
The results, in percentages, were submitted to ANOVA followed by Tukey's test (P < 0.05). There was statistical difference between the cycle group (23.84%) and the non cycle group (18.63%). Comparing the restoration technique, there was no statistical difference between bulk filling (19.62%) and three increments (22.84%). There was no statistical difference among the groups: Pulsatile light (24.38%), soft start (22.75%), LED (21.47%) or conventional (16.34%). Furthermore, there were no statistical differences between the adhesive systems: Clearfil SE Bond (21.32%) and Single Bond (20.83%).
The photoactivation methods, the restorative techniques and the adhesive systems did not influence gap formation.
本体外研究评估了不同粘结系统的复合树脂修复体在承受机械负荷时边缘封闭方法的影响。
80颗牛切牙冠嵌入聚氯乙烯（PVC）模具中，颊面暴露，制备洞形（4mm×4mm×3mm）。根据制造商的建议应用粘结系统，即单键粘结剂或Clearfil SE粘结剂。根据修复技术（整块充填或分三层充填）和光固化方式（传统光固化、软启动、脉冲光或发光二极管[LED]）用Z-250复合树脂充填洞形。用环氧树脂复制样本用于扫描电子显微镜观察。样本还承受机械负荷（200,000次循环；2Hz）并制作新的复制体。
结果以百分比表示，采用方差分析，随后进行Tukey检验（P<0.05）。循环组（23.84%）和非循环组（18.63%）之间存在统计学差异。比较修复技术，整块充填（19.62%）和分三层充填（22.84%）之间无统计学差异。脉冲光组（24.38%）、软启动组（22.75%）、LED组（21.47%）或传统光固化组（16.34%）之间无统计学差异。此外，粘结系统Clearfil SE粘结剂（21.32%）和单键粘结剂（20.83%）之间无统计学差异。
光固化方法、修复技术和粘结系统均不影响边缘间隙的形成。
