Agarwal Rolly Shrivastav, Hiremath Hemlatha, Agarwal Jatin, Garg Ashish
Department of Conservative Dentistry, Sri Aurobindo College of Dentistry, Indore, Madhya Pradesh, India.
Department of Prosthodontics, Sri Aurobindo College of Dentistry, Indore, Madhya Pradesh, India.
J Conserv Dent. 2015 Jan-Feb;18(1):56-61. doi: 10.4103/0972-0707.148897.
To evaluate the cervical marginal and internal adaptation of posterior bulk fill resin composites of different viscosities, before and after thermo-cycling (TMC).
Eighty box-only class II cavities were prepared in 40 extracted human premolars with the distal proximal box beneath the enamel-cementum junction (CEJ). The teeth in the experimental groups were restored with bulk fill resin composite restorations (Gr. I- Sonic Fill, Gr. II- SDR, Gr. III- Tetric N Ceram Bulk Fill or a conventional composite designed for 2-mm increments (Gr. IV- Tetric N Flow along with Tetric N Ceram). Before and after thermal cycling, the gap-free marginal length was analyzed using SEM of epoxy resin replicas. After thermal cycling, specimens were cut longitudinally in order to investigate internal dentine adaptation by epoxy replicas under SEM (500 × magnification).
Statistical analysis was performed using the ANOVA and Tukey Post Hoc tests (P < 0.05). In enamel, high percentages of gap-free margins were initially identified for all the groups, which declined after thermal cycling. However, no significant differences were identified among any of the groups (P > 0.05). In dentine, bulk fill groups performed at par with the incremental placement; for both marginal and internal adaptation (P < 0.05), for all materials except Tetric N Ceram Bulk Fill.
Viscosity of the bulk fill restorative material influenced the proportion of gap-free marginal interface and the internal adaptation in dentin.
评估不同粘度的后牙大块充填树脂复合材料在热循环（TMC）前后的颈部边缘适应性和内部适应性。
在40颗拔除的人类前磨牙上制备80个仅带有盒状的II类洞，远中邻面盒位于釉牙骨质界（CEJ）下方。实验组的牙齿用大块充填树脂复合材料修复（第一组 - Sonic Fill，第二组 - SDR，第三组 - Tetric N Ceram Bulk Fill或一种设计用于2毫米增量的传统复合材料（第四组 - Tetric N Flow以及Tetric N Ceram）。在热循环前后，使用环氧树脂复制品的扫描电子显微镜（SEM）分析无间隙边缘长度。热循环后，将标本纵向切割，以便通过扫描电子显微镜（500倍放大）下的环氧树脂复制品研究内部牙本质适应性。
使用方差分析（ANOVA）和Tukey事后检验进行统计分析（P < 0.05）。在釉质中，所有组最初均发现高比例的无间隙边缘，热循环后有所下降。然而，各组之间未发现显著差异（P > 0.05）。在牙本质中，除Tetric N Ceram Bulk Fill外，所有材料的大块充填组在边缘和内部适应性方面与增量放置组相当（P < 0.05）。
大块充填修复材料的粘度影响无间隙边缘界面的比例和牙本质的内部适应性。
