School of Dentistry, University of Passo Fundo, Passo Fundo, RS, Brazil.
School of Dentistry, Federal University of Santa Catarina, Florianópolis, SC, Brazil.
Eur J Oral Sci. 2024 Aug;132(4):e13002. doi: 10.1111/eos.13002. Epub 2024 Jun 27.
This study evaluated bond strength of glass fiber posts to root dentin using push-out (PO) and diametral compression (DC), testing glycolic acid as a conditioner and varying dentin moisture. An additional aim was to test whether DC can be an alternative test to PO for bond strength assessment. Eighty bovine teeth were divided into eight groups (n = 10) defined by the use of either 37% glycolic acid or 37% phosphoric acid (PA) on moist or wet dentin before bonding with either Adapter SingleBond/RelyX ARC or One Step Plus/Duo-Link Bisco. Each tooth provided discs with an internal diameter of 2 mm, external diameter of 5 mm, and height of 2 mm, which underwent PO and DC. Finite element analysis (FEA) was carried out on 3D models. When analyzing PO results through linear regression, the highest values of bond strength were observed using glycolic acid on wet dentin in the cervical and middle thirds of the teeth. Analyzing DC results, the only statistical influence on values was the dental thirds. The scatterplot of the DC results and the PO bond strength values indicated no relationship between the results of the two tests (r = 0.03; p = 0.64). PO test detected more sensitive changes in bond strength values than DC.
本研究通过推出（PO）和直径压缩（DC）测试评估了玻璃纤维桩与根管牙本质的粘结强度，测试了甘醇酸作为调节剂并改变了牙本质的湿度。另一个目的是测试 DC 是否可以作为 PO 的替代测试来评估粘结强度。80 颗牛牙被分为 8 组（n=10），根据在湿润或潮湿的牙本质上使用 37%甘醇酸或 37%磷酸（PA），然后使用 Adapter SingleBond/RelyX ARC 或 One Step Plus/Duo-Link Bisco 进行粘结。每个牙齿都提供了带有内径 2mm、外径 5mm 和高度 2mm 的圆盘，这些圆盘进行了 PO 和 DC 测试。对 3D 模型进行了有限元分析（FEA）。通过线性回归分析 PO 结果时，在牙齿的颈中和中三分之一处使用甘醇酸处理湿牙本质时，观察到最高的粘结强度值。分析 DC 结果时，唯一对值有统计学影响的是牙齿的三分之一。DC 结果和 PO 粘结强度值的散点图表明两种测试结果之间没有关系（r=0.03；p=0.64）。PO 测试比 DC 更能检测到粘结强度值的敏感变化。
