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Abstract：
(1) Background: The in vitro study aimed to investigate mechanical characteristics of resin composites and their suitability in direct restauration of endodontically treated teeth (ETT). (2) Methods: 38 endodontically treated premolars with occlusal access cavities were directly restored using the following resin composites and adhesives: Tetric Evo Ceram® + Syntac classic® (n = 10), Venus Diamond® + iBond Total-Etch® (n = 10), Grandio® + Solobond M® (n = 9), Estelite® Sigma Quick + Bond Force® (n = 9). After thermocycling, the elastic modulus, shear-bond-strength, fracture load (Fmax) and fracture mode distribution were evaluated. Statistical analysis: one-way ANOVA, t-test, Kruskal-Wallis test; p < 0.05. (3) Results: Grandio® showed the highest E-modulus (15,857.9 MPa) which was significant to Venus Diamond® (13,058.83 MPa), Tetric Evo Ceram® (8636.0 MPa) and Estelite® Sigma Quick (7004.58 MPa). The highest shear-bond-strength was observed for Solobond M® (17.28 MPa), followed by iBond® (16.61 MPa), Syntac classic® (16.41 MPa) and Bond Force® (8.37 MPa, p < 0.05). The highest fracture load (Fmax) was estimated for ETT restored with Venus Diamond® (1106.83 N), followed by Estelite® Sigma Quick (1030.1 N), Tetric Evo Ceram® (1029 N) and Grandio® (921 N). Fracture-mode distribution did not show any significant differences. (4) Conclusions: The observed resin composites and adhesives show reliable mechanical characteristics and seem to be suitable for direct restoration of endodontically treated teeth.
摘要：
（1）背景：体外研究旨在研究树脂复合材料的机械特性及其在牙髓治疗牙齿（ETT）直接修复中的适用性。（2）方法：使用以下树脂复合材料和粘合剂直接修复38个牙髓治疗的前磨牙与咬合腔：TetricEvoCeram®+Syntacclassic®（n=10），金星钻石®+iBond总蚀刻®(n=10)，Grandio®+SolobondM®(n=9)，Estelite®SigmaQuick+BondForce®(n=9)。热循环后，弹性模量，剪切粘结强度，对断裂载荷(Fmax)和断裂模式分布进行了评价。统计分析：单因素方差分析，t检验,Kruskal-Wallis检验;p<0.05。（3）结果：Grandio®显示出最高的E模量（15,857.9MPa），与VenusDiamond®（13,058.83MPa）相比，TetricEvoCeram®(8636.0MPa)和Estelite®SigmaQuick(7004.58MPa)。SolobondM®的剪切粘结强度最高(17.28MPa),其次是iBond®(16.61MPa)，Syntacclassic®(16.41MPa)和BondForce®(8.37MPa,p<0.05)。用VenusDiamond®(1106.83N)修复的ETT估计最高断裂载荷(Fmax),其次是Estelite®SigmaQuick(1030.1N)，TetricEvoCeram®(1029N)和Grandio®(921N)。断裂模式分布没有显示任何显着差异。（4）结论：观察到的树脂复合材料和粘合剂显示出可靠的机械特性，似乎适合直接修复经牙髓治疗的牙齿。
