Fatigue analysis of computer-aided design/computer-aided manufacturing resin-based composite vs. lithium disilicate glass-ceramic
Fatigue analysis of computer-aided design/computer-aided manufacturing resin-based composite vs. lithium disilicate glass-ceramic
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DOI：
10.1111/eos.12278
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发表时间：
2016-08-01
影响因子：
1.9
通讯作者：
Egusa, Hiroshi
中科院分区：
文献类型：
--
作者：
Ankyu, Shuhei;Nakamura, Keisuke;Egusa, Hiroshi
计算机辅助设计/计算机辅助制造（CAD/CAM）系统制造的树脂基复合磨牙冠被认为是金属陶瓷或全陶瓷冠的廉价替代品。然而，缺乏有关抗疲劳性的科学资料。本研究旨在分析CAD/CAM树脂基复合材料与二硅酸锂玻璃陶瓷的疲劳性能。采用树脂基复合块体[Lava Ultimate (LU)；3M/ESPE]和二硅酸锂玻璃陶瓷[IPS e.max压力机（EMP）；Ivoclar / Vivadent]。标本分为四组：未处理组（NT）；热循环；机械循环；然后是热循环，然后是机械循环。热循环通过交替浸泡在5℃和55℃的水浴中进行5 x 10(4)个循环。机械循环在三点弯曲试验中进行，最大载荷为40 N，为1.2 x 10(6)次循环。此外，制作了LU和EMP磨牙冠并进行了疲劳处理，然后进行了载荷-失效测试。疲劳处理并没有严重降低钢板的抗弯强度。疲劳处理对LU磨牙冠的抗折性无显著影响。结果表明，CAD/ cam生成的树脂基复合磨牙冠在抗疲劳方面具有临床应用潜力。
Resin-based composite molar crowns made by computer-aided design/computer-aided manufacturing (CAD/CAM) systems have been proposed as an inexpensive alternative to metal-ceramic or all-ceramic crowns. However, there is a lack of scientific information regarding fatigue resistance. This study aimed to analyze the fatigue behavior of CAD/CAM resin-based composite compared with lithium disilicate glass-ceramic. One-hundred and sixty bar-shaped specimens were fabricated using resin-based composite blocks [Lava Ultimate (LU); 3M/ESPE] and lithium disilicate glass-ceramic [IPS e.max press (EMP); Ivoclar/Vivadent]. The specimens were divided into four groups: no treatment (NT); thermal cycling (TC); mechanical cycling (MC); and thermal cycling followed by mechanical cycling (TCMC). Thermal cycling was performed by alternate immersion in water baths of 5 degrees C and 55 degrees C for 5 x 10(4) cycles. Mechanical cycling was performed in a three-point bending test, with a maximum load of 40 N, for 1.2 x 10(6) cycles. In addition, LU and EMP molar crowns were fabricated and subjected to fatigue treatments followed by load-to-failure testing. The flexural strength of LU was not severely reduced by the fatigue treatments. The fatigue treatments did not significantly affect the fracture resistance of LU molar crowns. The results demonstrate the potential of clinical application of CAD/CAM-generated resin-based composite molar crowns in terms of fatigue resistance.