Abstract

This study evaluated the effect of pre-heating a dual-polymerized adhesive and a dual-polymerized core build-up resin composite on their dentin micro-shear bond strength (µSBS), degree of conversion (DC%) and ultimate tensile strength (UTS). For µSBS, 45 human molars were divided into 9 groups (n = 5) according to two factors: (1) Adhesive temperature (25 °C/32 °C/40 °C) and 2- Resin composite temperature (25 °C/32 °C/40 °C). Dual-polymerized adhesive (Futurabond U/FBU) was applied over occlusal dentin at each temperature following the manufacturer’s instructions. Four dual-polymerized composites (Rebilda DC/RDC, VOCO) micro-cylinders (1.2 mm diameter × 1 mm height) were built-up over each dentin disc, after being pre-heated at each temperature. After storage (48 h/37 °C), µSBS testing was run at a crosshead speed of 1 mm/min. DC% of FBU/RDC was evaluated at each temperature after 48 h using FTIR. Hourglass-shaped specimens were fabricated from both materials at each respective temperature and pulled apart to evaluate UTS after 48 h storage. Data were analyzed by ANOVA/Tukey’s test/Pearson’s correlation (p = 0.05). Neither adhesive/composite temperature nor their interaction had a significant effect on µSBS. No significant difference in µSBS between groups, except within 40 °C FBU. Predominant failure mode was a mixed type. No significant difference in DC% of FBU groups. RDC at 40 °C had significantly higher DC% than 25 °C. No significant difference in UTS of FBU and RDC groups. Application of both dual-polymerized adhesive and resin composite at 40 °C seemed to reduce µSBS. Raising the temperature to 40 °C improved DC% of resin composite, with no effect on adhesive. Pre-heating did not influence the UTS of both materials.

摘要

本研究评估了预热双聚合粘合剂和双聚合核心构建树脂复合材料对其牙本质微剪切粘合强度 (µSBS)、转化度 (DC%) 和极限拉伸强度 (UTS) 的影响）。对于 µSBS，45 颗人类磨牙分为 9 组（n = 5) 根据两个因素：(1) 粘合剂温度 (25 °C/32 °C/40 °C) 和 2- 树脂复合温度 (25 °C/32 °C/40 °C)。按照制造商的说明，在每个温度下将双聚合粘合剂（Futurabond U/FBU）涂在咬合牙本质上。在每个温度下预热后，四个双聚合复合材料（Rebilda DC/RDC、VOCO）微圆柱体（直径 1.2 mm × 1 mm 高）被组装在每个牙本质盘上。储存后（48 小时/37 °C），µSBS 测试以 1 毫米/分钟的十字头速度运行。48 小时后，使用 FTIR 在每个温度下评估 FBU/RDC 的 DC%。沙漏形样品由两种材料在各自的温度下制成，并在储存 48 小时后拉开以评估 UTS。通过 ANOVA/Tukey 检验/Pearson 相关性分析数据 ( p = 0.05）。粘合剂/复合材料的温度和它们的相互作用都对 µSBS 没有显着影响。除 40 °C FBU 外，各组之间的 µSBS 没有显着差异。主要的失效模式是混合型。FBU 组的 DC% 没有显着差异。40 °C 下的 RDC 的 DC% 明显高于 25 °C。FBU 和 RDC 组的 UTS 没有显着差异。在 40 °C 下应用双聚合粘合剂和树脂复合材料似乎可以减少 µSBS。将温度提高到 40 °C 提高了树脂复合材料的 DC%，而对粘合剂没有影响。预热不影响两种材料的 UTS。