Laboratory simulation of longitudinally cracked teeth using the step-stress cyclic loading method.
Laboratory simulation of longitudinally cracked teeth using the step-stress cyclic loading method.
复制标题
用步进应力循环加载法对纵向裂纹牙齿的实验室模拟。
DOI：
10.1111/iej.13530
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发表时间：
2021-09
影响因子：
5
通讯作者：
Fok A
中科院分区：
文献类型：
--
作者：
Lin F;Ordinola-Zapata R;Xu H;Heo YC;Fok A
使用循环机械疲劳在实验室环境中模拟根部填充的前磨牙的纵向裂纹。在用纤维桩和树脂复合材料修复的二十个牙根填充、单根、下颌前磨牙中制备了近中-咬合-远中（MOD）空腔。根据加载方法将样品随机分为两组：十字头速度为 0.5 mm/min 的静态加载和幅度递增的阶跃应力循环加载（1 Hz）。记录失效的负载和循环次数。 Micro-CT 还用于识别骨折模式。使用T-student检验进行统计分析。显着性水平设置为0.05。静态加载组和循环加载组的平均断裂载荷分别为769±171 N和720±92 N。两组之间没有显着差异（p>0.05）。循环载荷下纵向、尖头和混合模式断裂的比例分别为50%、20%和30%。与其他断裂相比，纵向断裂的循环次数较多，每个循环的平均载荷较高。静态加载仅产生尖部骨折。采用阶跃应力循环加载法成功生产出带有根充物的纵向开裂前磨牙。这为在实验室环境中研究裂纹牙齿提供了一种更具临床代表性的方法。
To simulate in a laboratory setting longitudinal cracking in root filled premolar teeth, using cyclic mechanical fatigue. Mesial-occlusal-distal (MOD) cavities were prepared in twenty root filled, single-rooted, mandibular premolars restored with fibre posts and resin composites. The samples were randomly divided into two groups based on the loading approaches: static loading with a crosshead speed of 0.5 mm/min and step-stress cyclic loading (1 Hz) with increasing amplitude. The loads and numbers of cycles to failure were recorded. Micro-CT was also used to identify the fracture modes. Statistical analysis was performed using T-student test. The level of significance was set at 0.05 The mean fracture loads for the static-loading and cyclic-loading groups were 769±171 N and 720±92 N, respectively. There was no significant difference between the two groups (p>0.05). The proportions of longitudinal, cuspal and mixed-mode fractures under cyclic loading were 50, 20 and 30%, respectively. Longitudinal fractures occurred with larger numbers of cycles and higher average loads per cycle compared with the other fractures. Static loading produced only cuspal fractures. Longitudinally-cracked premolar teeth with root fillings were successfully produced using the step-stress cyclic loading method. This provides a more clinically-representative methodology for studying cracked teeth in a laboratory setting..
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影响因子：
5
作者：
Li, Yuping;Carrera, Carola;Chen, Ruoqiong;Li, Jianying;Chen, Yungchung;Lenton, Patricia;Rudney, Joel. D.;Jones, Robert S.;Aparicio, Conrado;Fok, Alex
通讯作者：
Fok, Alex
影响因子：
4.2
作者：
Krishan, Rajesh;Paque, Frank;Friedman, Shimon
通讯作者：
Friedman, Shimon
影响因子：
4.2
作者：
Berman, Louis H.;Kuttler, Sergio
通讯作者：
Kuttler, Sergio
影响因子：
5
作者：
Arola, Dwayne
通讯作者：
Arola, Dwayne
影响因子：
14
作者：
Kruzic, JJ;Nalla, RK;Ritchie, RO
通讯作者：
Ritchie, RO