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首页> 外文期刊>Journal of Conservative Dentistry >Effect of intratooth location and thermomechanical cycling on microtensile bond strength of bulk-fill composite resin
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Effect of intratooth location and thermomechanical cycling on microtensile bond strength of bulk-fill composite resin

机译：齿内位置和热机械循环对填充复合树脂微拉伸粘合强度的影响

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Context: The initial bond strength and potential durability of an adhesive restoration are significantly affected by regional variations in dentin composition. Aim: The aim of this study is to evaluate the influence of dentin location and thermomechanical cyclic loading on microtensile bond strength of bulk-fill composite resin to coronal dentin. Materials and Methods: Disto-occlusal cavity preparations were done on 60 extracted human mandibular molars with pulpal floor depth of 1.5 and 3.5 mm for superficial and deep dentin and 1.5 mm axial wall depth and are restored with bulk-fill restorative composite. Bond strength evaluation was done using universal testing machine, and mode of bond failure was observed under scanning electron microscope. Statistical Analysis: Statistical analyses were done using ANOVA and Tukey's multiple post hoc test. For comparison of failure mode, Mann–Whitney U-test was used. Results: Superficial dentin has shown higher bond strength compared to deep dentin and gingival wall dentin ( P = 0.001). The bond strength values decreased with the thermomechanical cycling ( P = 0.001). Deep dentin and gingival dentin have exhibited more of adhesive failures. Conclusion: Bond strength of bulk-fill composite was negatively influenced by the depth of dentin and thermomechanical loading.
机译：背景：牙本质成分的区域变化会显着影响粘合剂修复体的初始粘合强度和潜在耐久性。目的：本研究的目的是评估牙本质的位置和热机械循环载荷对填充复合树脂与冠状牙本质的微拉伸结合强度的影响。材料和方法：在60颗提取的人类下颌磨牙上进行牙合腔准备，其牙本质底部深度为1.5和3.5毫米（浅表和深部牙本质），轴向壁深度为1.5毫米，并用填充性修复复合材料修复。使用万能试验机进行粘合强度评估，并在扫描电子显微镜下观察粘合失败的模式。统计分析：使用ANOVA和Tukey的多次事后检验进行统计分析。为了比较故障模式，使用了Mann-Whitney U检验。结果：与深部牙本质和牙龈壁牙本质相比，浅层牙本质显示出更高的结合强度（P = 0.001）。粘结强度值随热机械循环而降低（P = 0.001）。深部牙本质和牙龈牙本质表现出更多的粘合失败。结论：牙本质的深度和热机械载荷对散装填充复合材料的粘结强度产生负面影响。

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