Mechanical and morphological evaluation of the bond-dentin interface in direct resin core build-up method
Mechanical and morphological evaluation of the bond-dentin interface in direct resin core build-up method
复制标题
直接树脂核构建方法中粘合-牙本质界面的机械和形态评估
DOI：
10.1016/j.dental.2012.11.003
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发表时间：
2013
期刊：
影响因子：
5
通讯作者：
Yatani H
中科院分区：
文献类型：
--
作者：
Matsumoto M;Miura J*;Takeshige F;Yatani H
本研究的目的是评价直接树脂核构建法中树脂与根管牙本质之间的界面粘结力，包括微拉伸粘结强度（μTBS）和牙本质微观形态。在根中制备10mm深的桩间隙。然后用双固化粘结系统处理空间，并用双固化树脂复合材料填充。在37°C的水中储存24小时后，将它们修剪成约1.0 mm 2的梁用于μTBS。采用单因素方差分析和Tukey检验分析粘结强度。通过扫描电子显微镜（SEM）和能量色散X射线能谱（EDX）检查断裂表面。结果：①从冠侧到根尖侧，根面牙本质粘结强度逐渐降低，冠侧牙本质粘结强度明显高于根侧牙本质粘结强度。此外，在冠侧和根尖侧的标本的失效模式不同。根尖标本在核材料内断裂，而冠状面标本在粘结层处断裂。SEM和EDX分析显示，核心材料渗透到牙本质小管在apical region.SIGNIFICANCE在直接树脂核心建设的方法，树脂根管牙本质的界面粘附可能是不够的，在根尖区域的根管，由于不良的聚合。
OBJECTIVESThe purpose of this study was to evaluate the interfacial adhesion between resin and root canal dentin in the direct resin core build-up method in terms of microtensile bond strength (μTBS) and dentin micro morphology.METHODSSingle-rooted human teeth were decoronated at the cementoenamel junction and endodontically treated. Post spaces were prepared in the roots to a depth of 10mm. The spaces were then treated with a dual-cure bonding system, and filled with dual-cure resin composite. After 24-h storage in water at 37°C, they were trimmed into approximately 1.0-mm2beams for μTBS. Bond strength was analyzed with one-way ANOVA and Tukey's test. The fractured surfaces were examined by scanning electron microscopy (SEM) and energy-dispersive X-ray spectrometry (EDX). Sectioned specimens were observed by ultra-high-voltage transmission electron microscopy.RESULTSThe bond strength of root dentin decreased gradually from the coronal to apical side, and the bond strength of the coronal section was significantly higher than that of the radicular section. Moreover, the failure modes in the coronal and apical sides of the specimens differed. The apical specimens fractured within the core material, while the coronal specimens fractured at the bonding layer. SEM and EDX analyses revealed that the core material penetrated into dentinal tubules in the apical region.SIGNIFICANCEIn the direct resin core build-up method, the interfacial adhesion of resin to root canal dentin may be insufficient in the apical region of the root canal due to poor polymerization.