Kim Su-Hyeon, Oh Tack-Oon, Kim Ju-Young, Park Chun-Woong, Baek Seung-Ho, Park Eun-Seok
School of Pharmacy, Sungkyunkwan University.
Dent Mater J. 2016;35(1):138-46. doi: 10.4012/dmj.2015-193.
The aim of this study was to observe the effects of different test conditions on the flexural properties of root canal post. Metal- and fiber-reinforced composite root canal posts of various diameters were measured to determine flexural properties using a threepoint bending test at different conditions. In this study, the span length/post diameter ratio of root canal posts varied from 3.0 to 10.0. Multiple regression models for maximum load as a dependent variable were statistically significant. The models for flexural properties as dependent variables were statistically significant, but linear regression models could not be fitted to data sets. At a low span length/post diameter ratio, the flexural properties were distorted by occurrence of shear stress in short samples. It was impossible to obtain high span length/post diameter ratio with root canal posts. The addition of parameters or coefficients is necessary to appropriately represent the flexural properties of root canal posts.
本研究的目的是观察不同测试条件对根管桩弯曲性能的影响。使用三点弯曲试验在不同条件下测量各种直径的金属和纤维增强复合根管桩，以确定其弯曲性能。在本研究中，根管桩的跨度长度/桩直径比在3.0至10.0之间变化。以最大载荷为因变量的多元回归模型具有统计学意义。以弯曲性能为因变量的模型具有统计学意义，但线性回归模型无法拟合数据集。在低跨度长度/桩直径比时，短样本中剪应力的出现会使弯曲性能失真。根管桩不可能获得高跨度长度/桩直径比。需要添加参数或系数来恰当地表示根管桩的弯曲性能。
