Zhu Zheng, Zhu Ya-Qin
Department of General Dentistry, Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine; Shanghai Key Laboratory of Stomatology. Shanghai 200011, China. E-mail:
Shanghai Kou Qiang Yi Xue. 2017 Jun;26(3):241-245.
To compare and evaluate microleakage at the occlusal wall and cervical wall in Class V cavities restored with Ivoclar Tetric N Ceram Bulk Fill composite, Tetric N Flow composite and N Ceram nanocomposite.
Sixty-six extracted human maxillary premolars, which were intact and healthy, were randomly assigned into 3 groups (n=22). Standardized Class V cavities were prepared on the buccal surface of maxillary premolars. The occlusal walls of the cavities were located on the enamel and the cervical walls were located on dentin and cementum. After etching and application of the same bonding agents, the cavities were restored with different composite materials. Group A: Tetric N Ceram nano-hybrid composite , Group B: Tetric N Flow nano-hybrid composite, Group C: Tetric N Ceram Bulk Fill nano-hybrid composite. After curing with soft-start mode, finishing and polishing, the specimens were subjected to thermocycling. The specimens were coated with nail varnish, and immersed in 2% methylene blue solution for 7 days. The teeth were then sectioned longitudinally. Two of the samples chosen randomly from each group were evaluated under scanning electron microscope. Dye penetration of the remaining samples was examined with a stereomicroscope (×40) and scored separately for occlusal and gingival aspect on a 0-3 ordinal scale. The leakage depth was measured with Spot Advanced version 4.6 software package. The data were analyzed with Kruskal-Wallis, Mann-Whitney and Wilcoxon test using SPSS 17.0 software package.
Tetric Bulk Fill had significantly less microleakage at the cervical margins than other groups (P<0.05). There was no significant difference at the occlusal margin (P>0.05) between the three groups. There was significant difference between the enamel and cervical wall microleakage (P<0.05).
With the limitations of this study, Tetric Bulk Fill provided the least microleakage at the cervical wall among the three groups. There was no significant difference at the occlusal margin.
比较和评估使用义获嘉Tetric N Ceram Bulk Fill复合树脂、Tetric N Flow复合树脂和N Ceram纳米复合树脂修复的V类洞在咬合壁和颈壁处的微渗漏情况。
选取66颗完整健康的拔除人上颌前磨牙，随机分为3组（n = 22）。在上颌前磨牙颊面制备标准化的V类洞。洞的咬合壁位于釉质，颈壁位于牙本质和牙骨质。酸蚀并应用相同的粘结剂后，用不同的复合材料修复洞。A组：Tetric N Ceram纳米混合复合树脂，B组：Tetric N Flow纳米混合复合树脂，C组：Tetric N Ceram Bulk Fill纳米混合复合树脂。采用软启动模式固化、修整和抛光后，对标本进行热循环处理。将标本涂上指甲油，浸入2%亚甲蓝溶液中7天。然后将牙齿纵向切开。从每组中随机选取两个样本在扫描电子显微镜下进行评估。其余样本的染料渗透情况用体视显微镜（×40）检查，并在0 - 3序数量表上分别对咬合面和牙龈面进行评分。使用Spot Advanced版本4.6软件包测量渗漏深度。使用SPSS 17.0软件包对数据进行Kruskal - Wallis、Mann - Whitney和Wilcoxon检验分析。
Tetric Bulk Fill在颈缘处的微渗漏明显少于其他组（P < 0.05）。三组在咬合缘处无显著差异（P > 0.05）。釉质和颈壁微渗漏之间存在显著差异（P < 0.05）。
在本研究的局限性下，Tetric Bulk Fill在三组中颈壁处的微渗漏最少。在咬合缘处无显著差异。
