Influence of central and peripheral dentin on micro-tensile bond strength estimated using a competing risk model.
Influence of central and peripheral dentin on micro-tensile bond strength estimated using a competing risk model.
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使用竞争风险模型评估中央和周边牙本质对微拉伸粘合强度的影响。
DOI：
10.1016/j.jmbbm.2020.104295
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Tagami J.
中科院分区：
文献类型：
--
作者：
Tichy A;Brabec M;Bradna P;Hosaka K;Chiba A;Tagami J.
牙科粘合剂的粘合性能最常使用微拉伸粘合强度（μTBS）测试进行评估。尽管缺乏证据，边缘标本往往被丢弃，以避免区域差异。因此，本研究探讨了中央和周边牙本质的μTBS是否不同。牙本质表面提取的人磨牙粘结与各种自酸蚀粘合剂，建立了一个树脂复合材料，切割成梁，并强调在张力。使用扫描电子显微镜将失效模式分类为粘附、牙本质内聚或其他。由于牙本质中的内聚失效频繁发生，并且可能混淆μTBS结果，因此使用区分失效模式的Weibull竞争风险（CR）模型分析中央/外周牙本质的数据，并将其结果与传统失效模式非区分Weibull模型进行比较。基于粘结破坏的强度数据，CR模型还估计了牙本质的强度。为了比较，在两个区域中测量牙本质的极限拉伸强度（UTS）。常规模型提示外周μTBS高于中枢μTBS。相反，CR模型显示区域之间的μTBS没有显著差异，但表明周边牙本质的强度更高。这一发现得到了UTS测量的证实，并进一步得到了中央牙本质内聚失效发生率显著较高的支持。因此，周边牙本质和中心牙本质一样，都可以用于μTBS测试，但如果牙本质内聚破坏频繁，则应使用CR模型进行统计分析，因为周边牙本质的强度更高。
The bonding performance of dental adhesives is most frequently evaluated using the micro-tensile bond strength (μTBS) test. Despite lacking evidence, peripheral specimens are often discarded to avoid regional variability. This study, therefore, examined whether μTBS to central and peripheral dentin differed. Dentin surfaces of extracted human molars were bonded with various self-etch adhesives, built up with a resin composite, cut into beams, and stressed in tension. Failure mode was classified as adhesive, cohesive in dentin, or other using scanning electron microscopy. Since cohesive failures in dentin were frequent and could confound μTBS results, the data from central/peripheral dentin were analyzed using a Weibull competing risk (CR) model distinguishing failure modes, and its outcomes were compared to a conventional failure mode non-distinguishing Weibull model. Based on the strength data of cohesively failed specimens, the CR model also estimated the strength of dentin. For comparison, the ultimate tensile strength (UTS) of dentin was measured in both regions. The conventional model suggested that peripheral μTBS was higher than central μTBS. Conversely, the CR model disclosed no significant difference in μTBS between the regions but indicated a higher strength of peripheral dentin. This finding was confirmed by UTS measurements, and further supported by the significantly higher incidence of cohesive failures in central dentin. Therefore, peripheral specimens can be used in the μTBS test as well as central ones, but a CR model should be used for statistical analysis if cohesive failures in dentin are frequent, as the strength of peripheral dentin is higher.
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全酸蚀和自酸蚀牙本质粘合剂系统在周边和中央牙本质组织上的粘合强度：微拉伸粘合强度测试。
影响因子：
--
作者：
C. Yeşilyurt;B. Bulucu
通讯作者：
B. Bulucu
DOI：
--
发表时间：
2001
期刊：
The journal of adhesive dentistry
影响因子：
--
作者：
R. Carvalho;C. Fernandes;R. Villanueva;Linda Wang;D. Pashley
通讯作者：
R. Carvalho;C. Fernandes;R. Villanueva;Linda Wang;D. Pashley
影响因子：
5
作者：
SANO, H;SHONO, T;PASHLEY, DH
通讯作者：
PASHLEY, DH
影响因子：
7.6
作者：
Pongprueksa, P.;De Munck, J.;Van Meerbeek, B.
通讯作者：
Van Meerbeek, B.
影响因子：
2.5
作者：
Inoue, S;Pereira, PNR;Sano, H
通讯作者：
Sano, H