Fracture strength of custom-fabricated Celay all-ceramic post and core restored endodontically treated teeth  

作　　者：ZHANG Yu-xing ZHANG Wei-hong LU Zhi-yue WANG Ke-li 

机构地区：[1]Department of Dentistry, Beijing Hospital, Beijing 100730, China

出　　处：《Chinese Medical Journal》2006年第21期1815-1820,共6页中华医学杂志（英文版）

摘　　要：Background The increased use of all-ceramic crown provides a rationale for tooth-colored core. Due to superior mechanical properties, Vita Celay infiltration ceramic developed for crown and bridge works presents the potential for fabricating all-ceramic posts and cores in one piece. This study was conducted to compare the fracture strength of endodontically treated teeth which were thereafter given different types of posts and cores and crowns restoration, respectively. The evaluated post-and-core systems are： custom-fabricated Celay all-ceramic post-core, custom cast metal post-core, and prefabricated stainless steel post （Parapost） with and without 2.0 mm dentine ferrule. Methods Sixty freshly extracted human maxillary central incisors were endodontically treated and randomly divided into five groups with 12 samples each. Group A： Celay ceramic post-cores restored teeth with 2.0 mm dentine ferrule. Group B： Celay ceramic post-cores restored teeth with no dentine ferrule. Group C： cast metal post-cores restored teeth with 2.0 mm dentine ferrule. Group D： cast metal post-cores restored teeth with no dentine ferrule. Group E： prefabricated post and composite cores restored teeth with 2.0 mm dentine ferrule. All teeth were restored with Celay ceramic crowns. Each specimen was subjected to a load at a 45-degree angle to the long axis on MTS 810 material testing machine until failure, at crosshead speed of 0.02 cm/minute. Analysis of variance followed by the Newman-Keuls pairwise multiple comparison tests were used to compare the results of the groups tested. Results There was a statistically significant difference among the five groups （P〈0.01）. Celay ceramic post-cores restored teeth with 2.0 mm dentine ferrule [（758.35± 119.26） N] and cast metal post-cores restored teeth with 2.0 mm dentine ferrule [（756.63± 166.22） N] had a significantly greater mean fracture strength than the other three groups in which no significant difference was observed. The 2.0 mm dentine ferrule could causeBackground The increased use of all-ceramic crown provides a rationale for tooth-colored core. Due to superior mechanical properties, Vita Celay infiltration ceramic developed for crown and bridge works presents the potential for fabricating all-ceramic posts and cores in one piece. This study was conducted to compare the fracture strength of endodontically treated teeth which were thereafter given different types of posts and cores and crowns restoration, respectively. The evaluated post-and-core systems are： custom-fabricated Celay all-ceramic post-core, custom cast metal post-core, and prefabricated stainless steel post （Parapost） with and without 2.0 mm dentine ferrule. Methods Sixty freshly extracted human maxillary central incisors were endodontically treated and randomly divided into five groups with 12 samples each. Group A： Celay ceramic post-cores restored teeth with 2.0 mm dentine ferrule. Group B： Celay ceramic post-cores restored teeth with no dentine ferrule. Group C： cast metal post-cores restored teeth with 2.0 mm dentine ferrule. Group D： cast metal post-cores restored teeth with no dentine ferrule. Group E： prefabricated post and composite cores restored teeth with 2.0 mm dentine ferrule. All teeth were restored with Celay ceramic crowns. Each specimen was subjected to a load at a 45-degree angle to the long axis on MTS 810 material testing machine until failure, at crosshead speed of 0.02 cm/minute. Analysis of variance followed by the Newman-Keuls pairwise multiple comparison tests were used to compare the results of the groups tested. Results There was a statistically significant difference among the five groups （P〈0.01）. Celay ceramic post-cores restored teeth with 2.0 mm dentine ferrule [（758.35± 119.26） N] and cast metal post-cores restored teeth with 2.0 mm dentine ferrule [（756.63± 166.22） N] had a significantly greater mean fracture strength than the other three groups in which no significant difference was observed. The 2.0 mm dentine ferrule could cause

关 键 词：fracture strength CERAMICS post and core nonvital tooth 

分 类 号：R782[医药卫生—口腔医学]