• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Journal of Prosthetic Dentistry >Fatigue resistance of CAD/CAM complete crowns with a simplified cementation process
【24h】

Fatigue resistance of CAD/CAM complete crowns with a simplified cementation process

机译：简化胶结工艺的CAD / CAM完整牙冠的抗疲劳性

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

Statement of problem Various computer-aided design and computer-aided manufacturing (CAD/CAM) materials are available to fabricate complete crowns. The type of material may have an effect on the longevity of these restorations. Purpose To evaluate the fatigue resistance, load-to-failure, failure mode, and antagonistic wear of complete molar computer-aided design and computer-aided manufacturing (CAD/CAM) crowns made of resin nanoceramic (RNC), feldspathic glass ceramic (FEL), or lithium disilicate (LD) placed with a simplified cementation process. Material and methods Forty-five molars received a standardized complete crown preparation and were restored with CAD/CAM crowns (1.5-mm thickness, n=15) made of RNC, FEL, and LD. After cementation, the restorations were submitted to cyclic isometric loading: 200 (×5000), 400, 600, 800, 1000, 1200, and 1400 N at a maximum of 30000 cycles each. Surviving specimens were axially loaded until failure or to a maximum load of 4500 N. The specimens were analyzed as to failure mode: catastrophic, possibly repairable, and repairable. The groups were compared by using the life table survival analysis and the t test (α=.05). Results All the specimens survived the fatigue process until the 800-N step. The survival rate of RNC was 80%, LD 93.3%, and FEL 6.6%. The survival of RNC and LD crowns did not differ from each other but exceeded that of FEL. Postfatigue load-to-failure test was 2500 N (FEL), 3122 N (RNC), and 3237 N (LD). No catastrophic failure occurred in the fatigue test, whereas all of the specimens in the load-to-failure test exhibited catastrophic fractures. Crowns made of RNC seemed to generate the least amount of antagonistic wear. Conclusions Posterior crowns made of RNC and LD were not statistically different, and both had significantly higher fatigue resistance than FEL. All materials survived beyond the normal range of masticatory forces, and all failures were possibly re-restorable except those in the load-to-failure test. RNC crowns seemed to cause less wear of the antagonist.
机译：问题陈述可以使用各种计算机辅助设计和计算机辅助制造（CAD / CAM）材料来制造完整的牙冠。材料的类型可能会影响这些修复体的寿命。目的评估由树脂纳米陶瓷（RNC），长石玻璃陶瓷（FEL）制成的完整磨牙的计算机辅助设计和计算机辅助制造（CAD / CAM）牙冠的耐疲劳性，破坏载荷，破坏模式和拮抗磨损）或采用简化胶结工艺放置的二硅酸锂（LD）。材料和方法45颗臼齿接受了完整的标准化牙冠准备，并用由RNC，FEL和LD制成的CAD / CAM牙冠（厚度1.5毫米，n = 15）进行修复。固井后，将修复体承受周期性等距载荷：200（×5000），400、600、800、1000、1200和1400 N，每个最大30000个循环。将存活的样品轴向加载，直到失效或最大载荷为4500N。对样品进行了失效模式分析：灾难性，可能可修复和可修复。使用寿命表生存分析和t检验比较各组（α= .05）。结果所有样品在疲劳过程中均存活到800-N。 RNC的生存率为80％，LD的生存率为93.3％，FEL的生存率为6.6％。 RNC和LD牙冠的存活率没有差异，但超过了FEL。疲劳后的载荷至失效测试为2500 N（FEL），3122 N（RNC）和3237 N（LD）。在疲劳试验中没有发生灾难性的破坏，而在载荷到破坏试验中的所有样品都表现出灾难性的断裂。由RNC制成的牙冠似乎产生的对抗性磨损最少。结论RNC和LD制成的后冠无统计学差异，且疲劳强度均显着高于FEL。所有材料都能幸免于难，超出了咀嚼力的正常范围，除了载荷失效试验中的所有失效外，所有失效都可以恢复。 RNC冠似乎减少了拮抗剂的磨损。

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