...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of the mechanical behavior of biomedical materials >Comparison of endocrowns made of lithium disilicate glass-ceramic or polymer-infiltrated ceramic networks and direct composite resin restorations: fatigue performance and stress distribution
【24h】

Comparison of endocrowns made of lithium disilicate glass-ceramic or polymer-infiltrated ceramic networks and direct composite resin restorations: fatigue performance and stress distribution

机译：锂静止玻璃 - 陶瓷或聚合物渗透陶瓷网络的Endocrows比较和直接复合树脂修复：疲劳性能和应力分布

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This study compared the fatigue performance and the stress distribution of endodontically treated molars restored with endocrowns obtained with lithium disilicate glass-ceramic or a polymer-infiltrated ceramic network, both processed by CAD-CAM, and direct composite restorations. Forty-eight human mandibular molars were randomly assigned into 03 groups (n = 16) and restored with endocrowns (LD lithium disilicate glass-ceramic or PICN polymer-infiltrated ceramic network) or with direct composite restorations. Fatigue testing followed a step-stress approach (initial maximum load of 200 N and 5000 cycles, incremental step load of 200N and 10,000 cycles/step, being the specimens loaded until failure or to a maximum of 135,000 cycles at 2800 N). The fatigue failure load and number of cycles until failure were recorded and statistically analyzed. Fractographic and finite element (FEA) analyzes were conducted as well. There were no differences in fatigue failure load, number of cycles until fracture and mean survival probabilities among groups. However, indirect endocrowns had higher mechanical structural reliability, and LD restorations lasted more time before start to failing. FEA showed that the stress concentration in tooth tissues was higher for the resin composite, followed by PICN and LD in a decreasing order. Almost all fractures were restricted to the restorative material (without tooth involvement), and origins were identified at occlusal surface. The type of restoration did not influence the fatigue failure load, number of cycles until fracture and mean survival probabilities of the restorative strategies. Despite that, the mechanical structural reliability of endocrowns, especially those made of lithium disilicate, was higher and lasted more time before start to failing.
机译：该研究比较了用锂静止玻璃 - 陶瓷或聚合物渗透陶瓷网络获得的耐心处理臼齿的疲劳性能和应力分布，由CAD-CAM处理，以及直接复合修复剂。将四十八个人的下颌臼齿随机分配到03组（n = 16）中，并用Endocrows（LD锂锂玻璃 - 陶瓷或PICN聚合物渗透陶瓷网络）或直接复合修复。疲劳测试遵循阶梯应力方法（初始最大载荷为200 n和5000次循环，200n和10,000个循环/步骤的增量步长/步骤，是装载的标本直至发生故障，或者在2800n处最大为135,000个循环。在记录和统计分析之前，疲劳失效负载和循环次数。也进行了配方和有限元（FEA）分析。疲劳失效载荷没有差异，循环次数，直到裂缝和群体之间的平均存活概率。但是，间接Endocrows机械结构可靠性更高，LD修复持续时间在开始失败之前持续更多时间。 FEA表明，树脂复合材料的牙齿组织中的应力浓度较高，然后以逐渐降低的顺序进行PICN和LD。几乎所有骨折都被限制在恢复材料（没有牙齿受累），并且在咬合表面鉴定起源。恢复的类型没有影响疲劳破坏载荷，循环次数，直到骨折和恢复策略的平均存活率。尽管如此，Endocrows的机械结构可靠性，特别是由锂峰锂制成的，较高并在开始失败之前持续更多时间。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号