Zhang Yuxing, Lu Zhiyue, Wang Keli
Department of Dentistry, Beijing Hospital.
Hua Xi Kou Qiang Yi Xue Za Zhi. 2002 Feb;20(1):39-41, 44.
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.
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.
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.
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.
本研究旨在比较定制的Celay全瓷桩核、定制铸造金属桩核以及预制不锈钢桩（Parapost）加复合树脂核在有或无2.0毫米牙本质箍情况下的抗折强度。
选取60颗近期拔除的人上颌中切牙，进行根管治疗后分为五组，每组12颗。给予以下处理：A组：带有2.0毫米牙本质箍的Celay陶瓷桩核；B组：无牙本质箍的Celay陶瓷桩核；C组：带有2.0毫米牙本质箍的铸造金属桩核；D组：无牙本质箍的铸造金属桩核；E组：带有2.0毫米牙本质箍的预制桩加复合树脂核。所有标本在测试前于室温100%湿度下保存30天。每个标本置于与长轴呈45度角的特殊夹具中，在MTS 810万能材料试验机上加载直至破坏，横梁速度为0.02厘米/分钟。采用方差分析及Newman-Keuls两两多重比较检验来比较各测试组的结果。
五组之间存在统计学显著差异（P < 0.01）。带有2.0毫米牙本质箍的Celay陶瓷桩核（758.35 N ± 119.26 N）和带有2.0毫米牙本质箍的铸造金属桩核（756.63 N ± 166.22 N）的平均破坏阈值显著高于其他三组，且其他三组之间无显著差异。有无2.0毫米牙本质箍的Celay桩核修复牙的抗折性存在统计学显著差异。
当最终修复体为全瓷冠且预备体有2.0毫米牙本质箍时，定制的Celay桩核可作为根管治疗后牙齿临床应用的一种选择。
