Han S-H, Park S-H
Oper Dent. 2018 Nov/Dec;43(6):631-641. doi: 10.2341/17-279-LR. Epub 2018 Apr 9.
: To compare the microtensile bond strengths of incremental and bulk-fill techniques under different C-factor and compliance conditions.
: Extracted human third molars were divided into three experimental groups. For group I, Class I cavities were prepared. For group II, MOD cavities of the same size were prepared. For group III, the cavities were prepared the same way as group II only with high compliance cavity walls. The cavity wall compliance of the specimens was evaluated. Each of these groups was divided into four subgroups. The teeth were restored using two different materials: TB (Tetric N-Ceram Bulk Fill; Ivoclar Vivadent, Hanau, Germany) and VB (Venus Bulk Fill; Heraeus Kulzer, Armonk, NY, USA), and two methods, either an incremental or bulk-fill technique. Then, the microtensile bond strengths (μ-TBSs) were measured and compared. The polymerization stresses of the composites were calculated using a custom-made device. The results were statistically analyzed using the Kruskal-Wallis test and Weibull analysis.
: In group I, the μ-TBS obtained using the incremental technique was significantly higher than that obtained by the bulk-fill technique ( p<0.05). In contrast, no difference of the μ-TBS value was observed between the two techniques in groups II and III. The μ-TBS value of group I was significantly lower than those of groups II and III ( p<0.05). No statistical difference in the μ-TBS was observed when the cavities were filled with either TB or VB ( p>0.05).
: The incremental technique showed higher bond strength than did the bulk-fill technique in high C-factor cavities. However, no difference was found between the two techniques in the low C-factor cavities. The bond strength in the high C-factor cavities was significantly lower than that of the low C-factor cavities.
比较在不同C因子和适应性条件下，分层充填技术和一次性充填技术的微拉伸粘结强度。
拔除的人类第三磨牙被分为三个实验组。第一组制备I类洞。第二组制备相同尺寸的MOD洞。第三组，洞的制备方式与第二组相同，但洞壁具有高适应性。评估标本的洞壁适应性。这些组中的每一组又分为四个亚组。使用两种不同的材料：TB（Tetric N-Ceram Bulk Fill；义获嘉伟瓦登特公司，德国哈瑙）和VB（Venus Bulk Fill；贺利氏古莎公司，美国纽约阿蒙克），以及两种方法，即分层充填技术或一次性充填技术对牙齿进行修复。然后，测量并比较微拉伸粘结强度（μ-TBS）。使用定制装置计算复合材料的聚合应力。结果采用Kruskal-Wallis检验和威布尔分析进行统计学分析。
在第一组中，使用分层充填技术获得的μ-TBS显著高于一次性充填技术获得的μ-TBS（p<0.05）。相比之下，在第二组和第三组中，两种技术之间未观察到μ-TBS值的差异。第一组的μ-TBS值显著低于第二组和第三组（p<0.05）。当用TB或VB充填洞时，未观察到μ-TBS的统计学差异（p>0.05）。
在高C因子的洞中，分层充填技术显示出比一次性充填技术更高 的粘结强度。然而，在低C因子的洞中，两种技术之间未发现差异。高C因子洞中的粘结强度显著低于低C因子洞中的粘结强度。
