CELAY全瓷桩核强度的研究

目的:比较Celay 全瓷桩核、铸造金属桩核及Parapost 预成桩复合树脂核修复的根管治疗牙全冠修复后的抗折裂强度。方法:60 个完整拔除的人上中切牙,根管治疗后随机分为5 组,每组12 个。A 组:牙体预备保留210 mm高的牙本质套圈,Celay 桩核;B 组:牙体预备无牙本质套圈,Celay 桩核;C 组:牙体预备保留210 mm 高的牙本质套圈,铸造金属桩核;D 组:牙体预备无牙本质套圈,铸造金属桩核;E 组:牙体预备保留210 mm高的牙本质套圈,Para2post 预成桩,复合树脂核。所有标本皆用Celay 全冠修复。标本在室温下保存于100 %湿度中30 d 后,在MTS 810 材料试验机上沿与牙长轴成45°的方向加载,测试折裂强度。结果:各组的折裂强度间有显著性差异( P < 0101) ,牙体预备保留210 mm高的牙本质套圈时,Celay 桩核与铸造金属桩核的折裂强度显著高于其他三组,其他三组之间无显著性差异,Celay 桩核修复时,有无210 mm高的牙本质套圈其折裂强度有显著性差异( P < 0105) 。结论:在牙体预备保留210 mm高的牙本质套圈时,Celay 桩核的强度可基本满足临床要求而不致发生桩核的折裂。

Fracture Strength of Custom-fabricated Celay All-ceramic Post and Core

OBJECTIVE: The purpose of this study is to compare the fracture strengths of custom-fabricated Celay all-ceramic post-core, custom cast metal post-core, and prefabricated stainless steel post (Parapost) plus composite resin core with or without a 2.0 mm dentine ferrule. METHODS: A total of 60 recently extracted human maxillary central incisors were endodontically treated and divided into five groups of 12. They were given the following treatments: Group A: Celay ceramic post-core with 2.0 mm dentine ferrule, Group B: Celay ceramic post-core with no dentine ferrule, Group C: cast metal post-core with 2.0 mm dentine ferrule, Group D: cast metal post-core with no dentine ferrule, and Group E: prefabricated post and composite core with 2.0 mm dentine ferrule. All specimens were stored at 100% humidity at room temperature for 30 days before testing. Each specimen was in a special jig at a 45 degrees angle to the long axis and subjected to a load on MTS 810 universal material testing machine until failure, with crosshead speed of 0.02 cm/min. Analysis of variance followed by the Newman-Keuls pairwise multiple comparison test was used to compare the results of the groups tested. RESULTS: There was a statistically significant difference between five groups (P < 0.01). Celay ceramic post-core with 2.0 mm dentine ferrule (758.35 N +/- 119.26 N) and cast metal post-core with 2.0 mm dentine ferrule (756.63 N +/- 166.22 N) had a significantly larger mean failure threshold for fracture than the other three groups which had no significant difference between each other. There was a statistically significant difference between the fracture resistance of Celay post-core restored teeth with and without 2.0 mm dentine ferrule. CONCLUSION: The custom-fabricated Celay post-core could be a choice for clinical use in endodontically treated tooth when the final restoration is an all-ceramic crown and the preparation has a 2.0 mm dentine ferrule.