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关键词： 生物陶瓷材料   慢性根尖周炎   根管充填   效果  

摘要： 目的 明确生物陶瓷材料应用于治疗慢性根尖周炎根管充填中的疗效。方法 常规 填充组采用AH-plus糊剂进行根管充填，陶瓷填充组采用生物陶瓷材料（iRoot SP）进行根管充 填。结果 陶瓷填充组填充后48 h疼痛程度比常规填充组低，疼痛消失时间、用药时间、治疗时 间比常规填充组少，差异存在统计学意义（P＜0.05）;治疗前，两组的O-PAI等级、GI、SBI、 PLI、PD指标比较，差异无统计学意义（P＞0.05）;治疗后，两组的指标均有所降低，但是陶瓷 填充组比常规填充组更低，差异有统计学意义（P＜0.05）。结论 将生物陶瓷材料应用在治疗慢 性根尖周炎根管充填中效果很显著，提升预后效果。

关键词： Self-lubricating cermet   Multilayer core-shell microstructure   Mechanical properties   Residual stress toughening  

摘要： In order to promote the mechanical characteristics of Ti(C,N)-based self-lubricating cermet, Al2O3 coated CaF2(CaF2@Al2O3) nanocomposite powders are introduced into Ti(C,N) matrix to produce Ti(C,N) selflubricating cermet materials with multilayer core-shell microstructures (Ti(C,N)/Mo-Co-Ni/CaF2@Al2O3) by means of vacuum hot pressing sintering. Firstly, the external of the nano-CaF(2)particles was covered by a layer of nano-Al2O3, which was based on the principium of heterogeneous nucleation. Then the coated powders were added into the Ti(C,N)-Mo-Co-Ni materials system to form the microstructure of (CaF2@Al2O3)@Mo-Co-Ni multilayer core-shell, which was based on based the hightemperature liquid phase diffusion mechanism of Mo-Co-Ni during sintering. The experimental results showed that formation of the multilayered core-shell microstructure could improve the mechanical properties of Ti(C,N) cermet materials. 10 vol% of the CaF2@Al2O3 content in TMC (Ti(C,N)/Mo-Co-Ni/ CaF2@Al2O3) exhibited the optimal performance in the comprehensive mechanical properties, including the hardness of 23.93 GPa, the fracture toughness of 9.94 MPa m(1/2), and the flexural strength of 997 MPa. Compared with Ti(C,N)/Mo-Co-Ni cermet materials, the fracture toughness and the hardness of TMC cermet materials was increased by 31.83% and 24.25%, respectively. (C) 2019 Elsevier B.V. All rights reserved.