Influence of fiber posts on the fracture resistance of endodontically treated premolars with different dental defects

作     者：Qian-Qian Hou Yi-Ming Gao Lei Sun 

作者机构：School of Medicine Shanghai Jiao Tong University Department of Stomatology Ruijin Hospital School of Medicine Shanghai Jiao Tong University 

出 版 物：《International Journal of Oral Science》 (国际口腔科学杂志（英文版）)

年 卷 期：2013年第5卷第3期

页      面：167-171页

核心收录：

学科分类：1003[医学-口腔医学] 100302[医学-口腔临床医学] 10[医学] 

基　　金：granted by Shanghai Health Bureau (2010244) 

主　　题：dynamic loading fiber post fracture resistance residual wall 

摘      要：This study aimed to evaluate the influence of quartz fiber post placement on the fracture resistance of endodontically treated premolars with different dental defects under dynamic *** extracted single-rooted mandibular premolars were randomized into five *** group was prepared according to numbers of residual walls ranged from 0 to *** each group was divided into two subgroups with one restored with quartz fiber posts and the other without *** no-post groups,gutta percha point 2 mm below cemento-enamel junction was *** resin was adapted to the well and used to shape the core *** tooth was restored with a complete metal *** loading was carried out in a masticatory simulator with a nominal load of 50 N at 2 Hz for 300 000 loading *** a quasi-statically load was applied in a universal testing machine 306 to the long axis with a crosshead speed of 1 mm？min21until *** were analyzed with one-way analysis of variance and pairwise comparison（P,0.05）.No specimens failed during dynamic *** fracture resistance enhanced with the increase of numbers of coronal walls and the differences were significant（P,0.05）.Placement of fiber posts had a significant effect when fewer than two walls remained（P,0.05）,but it had no significant influence in groups with two,three or four walls（P.0.05）.Fiber post did not change failure mode,and the fracture pattern was mainly *** dentin walls need to be retained in *** no less than two walls remained,a fiber post is not always necessary.