Fatigue behavior and crack initiation of CAD/CAM resin composite molar crowns
Fatigue behavior and crack initiation of CAD/CAM resin composite molar crowns
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DOI：
10.1016/j.dental.2018.07.002
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发表时间：
2018-10-01
期刊：
影响因子：
5
通讯作者：
Imazato, Satoshi
中科院分区：
文献类型：
--
作者：
Yamaguchi, Satoshi;Kani, Renshirou;Imazato, Satoshi
目的：本研究的目的是使用体外阶跃应力加速寿命试验 (SSALT) 评估长期疲劳行为，并使用计算机辅助设计和制造 (CAD/CAM) 磨牙冠的计算机辅助设计和制造 (CAD/CAM) 计算有限元分析确定裂纹萌生点，该磨牙冠由三种商用 CAD/CAM 树脂复合块制成：Cerasmart（CS；GC，日本东京）、Katana Avencia Block（KA；Kuraray Noritake Dental，日本新泻）和 Shofu Block HC（HC；Shofu，Kyoto，Japan）。方法：将固定在树脂芯模具上的五十一个下颌第一磨牙冠嵌入丙烯酸树脂中并用聚氯乙烯管覆盖。对五个牙冠进行了单次压缩测试。使用三种轮廓和 120,000 次循环的可靠性对 36 个牙冠进行了 SSALT，并进行了威布尔分析。通过三维有限元分析对每个CAD/CAM树脂复合冠模型的最大主应变进行分析。结果：CS和KA的断裂载荷（3784+/-144N和3915+/-313N）显着大于HC（2767+/-227N）（p<0.05）。 120,000 次循环时的断裂概率为 24.6% (CS)、13.7% (KA) 和 14.0% (HC)。在 CS 和 KA 的近中舌尖以及 HC 的远颊尖周围观察到最大主应变。 意义：含有较高树脂基质分数的纳米填料的 CAD/CAM 树脂复合磨牙冠表现出更高的断裂载荷和更长的寿命，表明这些牙冠在疲劳行为方面可以用作陶瓷牙冠的替代品。 (C) 2018 年牙科材料学会。由爱思唯尔公司出版。保留所有权利。
Objective: The aim of this study was to evaluate long-term fatigue behavior using an in vitro step-stress accelerated life test (SSALT), and to determine the crack initiation point using in silico finite element analysis for computer-aided designed and manufactured (CAD/CAM) molar crowns fabricated from three commercial CAD/CAM resin composite blocks: Cerasmart (CS; GC, Tokyo, Japan), Katana Avencia Block (KA; Kuraray Noritake Dental, Niigata, Japan), and Shofu Block HC (HC; Shofu, Kyoto, Japan).Methods: Fifty-one mandibular first molar crowns luted on a resin core die were embedded in acrylic resin and covered with a polyvinyl chloride tube. Single compressive tests were performed for five crowns. SSALT was conducted for 36 crowns using three profiles and reliabilities at 120,000 cycles, and a Weibull analysis was conducted. The maximum principal strain of each CAD/CAM resin composite crown model was analyzed by three-dimensional finite element analysis.Results: Fracture loads of CS and KA (3784 +/- 144 N and 3915 +/- 313 N) were significantly greater than that of HC (2767 +/- 227 N) (p < 0.05). Fracture probabilities at 120,000 cycles were 24.6% (CS), 13.7% (KA), and 14.0% (HC). Maximum principal strain was observed around the mesiolingual cusps of CS and KA and the distobuccal cusp of HC.Significance: CAD/CAM resin composite molar crowns containing nano-fillers with a higher fraction of resin matrix exhibited higher fracture loads and greater longevity, suggesting that these crowns could be used as an alternative to ceramic crowns in terms of fatigue behavior. (C) 2018 The Academy of Dental Materials. Published by Elsevier Inc. All rights reserved.