Kumagai Rose Yakushijin, Zeidan Leonardo Colombo, Rodrigues Jose Augusto, Reis André Figueiredo, Roulet Jean-François
J Adhes Dent. 2015 Aug;17(5):427-32. doi: 10.3290/j.jad.a35012.
To evaluate the microtensile bond strength (μTBS) of a bulk-fill low-stress resin-based composite to dentin from gingival walls of Class II MOD cavities.
Class II MOD cavities were prepared in 44 human molars with the distal and mesial proximal boxes 4 and 6 mm deep, respectively. Eight experimental groups (n = 11) were obtained by a factorial design including 1. "composite" in two levels: a bulk-fill low-stress composite (SureFil SDR Flow, Dentsply Caulk) and a conventional composite (Filtek Z350 XT, 3M ESPE); 2. "filling technique" in two levels: bulk-fill (Bf) and incremental (In); and 3. "depth" in two levels: 4 mm and 6 mm in order to create different polymerization conditions. Twenty-four hours after placement of restorations, teeth were sectioned into beams with a cross-sectional bonded area of approximately 1 mm2. Bonded beams obtained from the gingival walls of the proximal boxes were tested in tension at a crosshead speed of 1 mm/min. Data were submitted to a 3-way ANOVA followed by a post-hoc Tukey's test (p < 0.05).
ANOVA failed to identify significant differences for the triple and double interaction between factors. However, significant differences were observed for the factors "composite" and "filling technique" (p < 0.05). SDR presented significantly higher μTBS values for bulk and incremental filling techniques (p < 0.05), and the incremental filling technique presented significantly higher μTBS values for both composites (p < 0.05).
It can be concluded that the bulk-fill flowable composite SDR may improve the bond strength to the gingival walls of Class II MOD cavities.
评估一种大块充填低应力树脂基复合材料与Ⅱ类MOD洞龈壁牙本质之间的微拉伸粘结强度（μTBS）。
在44颗人磨牙上制备Ⅱ类MOD洞，远中及近中邻面盒分别深4mm和6mm。通过析因设计得到8个实验组（n = 11），包括：1. “复合材料”有两个水平：一种大块充填低应力复合材料（SureFil SDR Flow，登士柏卡沃）和一种传统复合材料（Filtek Z350 XT，3M ESPE）；2. “充填技术”有两个水平：大块充填（Bf）和分层充填（In）；3. “深度”有两个水平：4mm和6mm，以创造不同的聚合条件。修复体放置24小时后，将牙齿切成横截面粘结面积约为1mm²的小梁。从邻面盒龈壁获得的粘结小梁以1mm/min的十字头速度进行拉伸测试。数据进行三因素方差分析，随后进行事后Tukey检验（p < 0.05）。
方差分析未发现因素间三重和双重交互作用的显著差异。然而，观察到“复合材料”和“充填技术”因素存在显著差异（p < 0.05）。对于大块充填和分层充填技术，SDR的μTBS值显著更高（p < 0.05），并且对于两种复合材料，分层充填技术的μTBS值均显著更高（p < 0.05）。
可以得出结论，大块充填可流动复合材料SDR可能会提高与Ⅱ类MOD洞龈壁的粘结强度。
