Effect of loading frequency on cyclic fatigue lifetime of a standard-diameter implant with an internal abutment connection.
Effect of loading frequency on cyclic fatigue lifetime of a standard-diameter implant with an internal abutment connection.
复制标题
加载频率对具有内部基台连接的标准直径植入物的循环疲劳寿命的影响。
DOI：
10.1016/j.dental.2018.09.001
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发表时间：
2018-12
期刊：
影响因子：
--
通讯作者：
Griggs JA
中科院分区：
文献类型：
--
作者：
Duan Y;Griggs JA
探讨加载频率对标准直径钛种植体系统疲劳寿命的影响。按照制造商的说明组装了36个钛牙科种植体样本（Bone Level RC，Straumann），并按照ISO 14801试验标准规定的设备将其扭转到圆柱形保持器块中。将不锈钢加载半球粘结在基台上，力臂为11 mm。保持器块具有不同刚度的层，以模拟人类颌骨。恒定应力疲劳寿命测试在两个频率（2 Hz和15 Hz）下进行，应力比为0.1，直至在37 °C的去离子水中在伺服液压载荷架（MTS）上断裂。取出断裂试样，并使用断口分析技术进行检查，以确定失效模式。使用寿命数据拟合至一般对数线性回归模型。回归模型的载荷振幅项的系数表明，增加载荷振幅对疲劳寿命具有统计学显著的负面影响。循环频率项和载荷-频率交互作用项的系数与零没有显著差异，这表明增加载荷频率对失效循环次数没有影响。断口分析显示，所有样本显示出相同的基台和基台螺钉在骨水平附近的联合断裂。某些植入物系统的未来研究可使用至少高达15 Hz的更高加载频率，以提高疲劳测试的效率。
To investigate the effect of loading frequency on the fatigue lifetime of one standard-diameter titanium dental implant system. Thirty-six titanium dental implant specimens (Bone Level RC, Straumann) were assembled following manufacturer’s instructions and torqued into cylindrical holder blocks following the apparatus specified by the ISO 14801 test standard. Stainless steel loading hemispheres were bonded on the abutments with a moment arm of 11 mm. The holder blocks had layers of differing stiffness to simulate human jaw bone. Constant-stress fatigue lifetime testing was conducted at two frequencies (2 Hz and 15 Hz) with a stress ratio of 0.1 until fracture in deionized water at 37 °C on servo-hydraulic load frames (MTS). The fractured specimens were retrieved and examined using fractographic technique to determine the failure mode. The lifetime data were fit to a general log-linear regression model. The coefficient for the load amplitude term of the regression model indicated that increasing load amplitude had a statistically significant negative effect on the fatigue lifetime. The coefficients for the cyclic frequency term and the load-frequency interaction term were not significantly different from zero, which indicated that increasing loading frequency did not have an influence on the number of cycles to failure. Fractographic analysis showed that all specimens exhibited an identical combined fracture of abutment and abutment screw adjacent to the bone level. Higher loading frequency at least up to 15 Hz may be used for future studies of some implant systems to improve the efficiency of fatigue testing.
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