Abstract

The aim of this study was to evaluate the effect of the type of preheated resin composite on the microtensile bond strength (µTBS) between dentin and feldspathic ceramic inlays. Thirty healthy human premolars received inlay preparations for feldspathic ceramic restorations and were then divided into three treatment groups according to the luting agent (n = 10): Conventional Resin Cement (RC), Preheated Nanofilled Methacrylate-Based Resin composite (MB), and Preheated Microhybrid Silorane-Based Resin composite (SB). The composite resin was preheated to 55 °C, considering the cementation group. After cementation, the sets were cut into slabs with a bonding area of 1 mm² to be further submitted to the µTBS test (0.5 mm/min, and10 Kgf load cell). One-way ANOVA and Tukey test (p < .5) were performed to analyze the bond strength data (MPa). Failures were observed under a stereomicroscope and representative specimens were evaluated using a Scanning Electron Microscopy (SEM). ANOVA revealed that the type of luting agent utilized was significant (p = .001). Bond strength values for the RC (7.37 ± 1.27 MPa)^A and MB (6.98 ± 1.96 MPa)^A treatment groups were similar and greater than the SB (4.74 ± 1.65 MPa)^B. Adhesive failures between the cementing agent and ceramic were prevalent for the treatment groups. The preheated nanofilled methacrylate resin-based composite technique can promote bond strength similar to resin cement, whereas preheated silorane-based resin composite as a luting agent should be seen with caution. Thus, we concluded that the type of luting agent has influenced the µTBS of feldspathic restoration to dentin.

摘要

本研究的目的是评估预热树脂复合材料类型对牙本质和长石陶瓷嵌体之间的微拉伸粘合强度 (µTBS) 的影响。30 颗健康人类前磨牙接受了长石陶瓷修复体的嵌体准备，然后根据粘接剂分为三个治疗组（n  = 10）：常规树脂水泥 (RC)、预热纳米填充甲基丙烯酸酯基树脂复合材料 (MB) 和预热微杂化硅氧烷基树脂复合材料 (SB)。考虑到胶接组，将复合树脂预热至 55 °C。粘合后，将这些组切成粘合面积为 1 mm ²的板，以进一步进行 µTBS 测试（0.5 mm/min，和 10 Kgf 称重传感器）。单因素方差分析和 Tukey 检验 (p  < .5) 用于分析粘合强度数据 (MPa)。在立体显微镜下观察到故障，并使用扫描电子显微镜 (SEM) 评估代表性样品。ANOVA 显示所使用的粘固剂类型非常显着 ( p  = .001)。^{RC (7.37 ± 1.27 MPa) A}和 MB (6.98 ± 1.96 MPa) ^A处理组的粘合强度值相似且大于 SB (4.74 ± 1.65 MPa) ^B. 在治疗组中，胶合剂和陶瓷之间的粘合失效很普遍。预热的纳米填充甲基丙烯酸酯树脂基复合材料技术可以提高与树脂水泥相似的粘合强度，而预热的硅氧烷基树脂复合材料作为粘合剂应谨慎使用。因此，我们得出结论，粘固剂的类型影响了长石修复牙本质的 µTBS。