CAD-CAM复合材料的疲劳行为与脱酸玻璃陶相比
Yousef Karevan1, Maher Eldafrawy1, Raphael Herman1
1Dental Biomaterials Research Unit (d-BRU), Institute of Dentistry, University of Liège (ULiège), Liège, Belgium.
概括
四种CAD-CAM复合材料的寿命较短,但耐疲劳性与二氧化玻璃陶相比相当. 在水中进行延长疲劳测试对于了解临床条件下的复合物行为至关重要.
科学领域:
- 牙科材料科学 牙科材料科学
- 生物材料工程 生物材料工程
- 机械工程 机械工程
背景情况:
- 计算机辅助设计/计算机辅助制造 (CAD-CAM) 复合材料越来越多地用于修复性牙科.
- 了解它们的疲劳特性对于预测长期临床性能至关重要.
- 二氧化玻璃陶 (例如,IPS e.max CAD) 作为牙科修复中的基准材料.
研究的目的:
- 评估和比较四种不同的CAD-CAM复合材料的疲劳性能.
- 为了比较CAD-CAM复合材料的疲劳性能与脱酸玻璃陶参考材料.
- 调查时间依赖因素对这些牙科材料疲劳行为的影响.
主要方法:
- 四种CAD-CAM复合材料 (Brilliant Crios,Cerasmart 270,Grandio,Tetric CAD) 和二氧化玻璃陶 (IPS e.max CAD) 进行了测试.
- 材料经过3点曲试验和疲劳试验,在36°C的水浴中生成S-N曲线,周期长达3x10^6.
- 使用显微镜技术 (数字,激光共聚焦,扫描电子显微镜) 来分析爬行和断裂表面.
主要成果:
- 与脱酸玻璃陶相比,CAD-CAM复合材料的疲劳寿命较短.
- 在CAD-CAM复合材料和参考材料之间,疲劳退化和缓慢裂纹生长参数是可比的.
- 对于CAD-CAM复合材料的疲劳数据显示,其变异性低于脱酸玻璃陶,并且在复合材料中观察到3x10^6周期的爬行.
结论:
- 尽管使用寿命较短,但CAD-CAM复合材料表现出与二氧化玻璃陶相似的耐疲劳性.
- 时间依赖因素显著影响复合疲劳,特别是在较低的压力水平.
- 在水性环境中进行扩展性疲劳测试对于准确预测牙科材料的临床性能至关重要.
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