Department of Endodontics and Operative Dentistry, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China.
Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, National Clinical Research Center of Stomatology, Shanghai, 200011, China.
Sci Rep. 2018 Feb 5;8(1):2350. doi: 10.1038/s41598-018-20891-3.
The push-out (PO) test and the diametral compression (DC) test were performed to compare the merits of two post-dentin bond strength measurement methods. Compared with the push-out test, the disk in DC provided post-dentin bond strength measurements that were more precise. The load-displacement curves from the DC test were much smoother and more linear up to the point of fracture when compared to those from the PO test. Compared to the PO test, DC is easier to perform for determining the bond strength between posts and dentin. No specimen alignment is needed in the DC test, and it produces a smaller standard deviation in the measured bond strength. The main disadvantage of the DC test, however, is that finite element analysis (FEA) is required to calculate the bond strength. The shear bond strength given by the PO test based on the simple formula is not valid, though, and the peak failure load is dependent on friction at the post-dentin interface.
推出（PO）试验和直径压缩（DC）试验用于比较两种牙本质粘结强度测量方法的优点。与推出试验相比，DC 中的圆盘提供了更精确的牙本质粘结强度测量值。与 PO 试验相比，DC 试验的载荷-位移曲线在断裂点之前更加平滑和线性。与 PO 试验相比，DC 更易于确定桩与牙本质之间的粘结强度。DC 试验不需要对试件进行对齐，并且在测量粘结强度时产生的标准偏差更小。然而，DC 试验的主要缺点是需要进行有限元分析（FEA）来计算粘结强度。PO 试验基于简单公式给出的剪切粘结强度是无效的，并且峰值失效载荷取决于桩-牙本质界面的摩擦力。
