Influence of masticatory fatigue on the fracture resistance of the pulpless teeth restored with quartz-fiber post-core and crown

作     者：Er-Min Nie Xia-Yun Chen Chun-Yuan Zhang Li-Li Qi Ying-He Huang 

作者机构：Department of ProsthodonticsThe First Affiliated HospitalSun Yat-Sen University Department of ProsthodonticsThe Third Affiliated HospitalSun Yat- Sen University Department of StomatologyTaishan People's Hospital 

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

年 卷 期：2012年第4卷第4期

页      面：218-220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：supported by the Guangdong Province Science and Technology Commission (2008B080703019  2011B080701010 and 2011B080701086) 

主　　题：fracture resistance masticatory fatigue pulpless teeth quartz-fiber 

摘      要：To investigate whether masticatory fatigue affects the fracture resistance and pattern of lower premolars restored with quartz-fiber post-core and full crown, 44 single rooted lower premolars recently extracted from orthodontic patients were divided into two groups of 22 each. The crowns of all teeth were removed and endodontically treated and then restored with quartz-fiber post-core and full crown. Twenty-two teeth in one group were selected randomly and circularly loaded at 45° to the long axis of the teeth of 127.4 N at a 6 Hz frequency, and the other group was not delivered to cyclic loading and considered as control. Subsequently, all teeth in two groups were continually loaded to fail at 45° to the long axis of the teeth at a crosshead speed of 1 ***-1. The mean destructive force values were （733.88±254.99） and （869.14±280.26） N for the experimental and the control group, respectively, and no statistically significant differences were found between two groups （P〉O.05）. Bevel fracture and horizontal fracture in the neck of root were the major fracture mode of the specimens. Under the circumstances of this study, it seems that cyclic loading does not affect the fracture strength and pattern of the quartz-fiber post-core-crown complex.