Pourkhalili Hossein, Maleki Donya
Department of Prosthodontics, Dental Sciences Research Center, Faculty of Dentistry, Guilan University of Medical Sciences, Rasht, Iran.
Department of Prosthodontics, Student Research Committee, Faculty of Dentistry, Guilan University of Medical Sciences, Rasht, Iran.
Dent Res J (Isfahan). 2022 Feb 28;19:20. doi: 10.4103/1735-3327.338783. eCollection 2022.
It is unclear which the material is a better choice for post and core rehabilitation systems in endodontically treated teeth. This study aimed to compare the fracture resistance of three different postcore systems.
In this study, 33 extracted premolars were treated endodontically and divided into three groups, namely (A) the prefabricated fiberglass postcomposite core, (B) the Ni-Cr cast postcore, and (C) the polyetheretherketone (PEEK) postcore groups. After postcementation, the core was restored with Ni-Cr crown. By a universal testing machine, the fracture resistance of the posts was assessed. Furthermore, types of fractures were determined with radiography and confirmed objectively by cutting the acryl resin boxes. The data of the fracture resistance were analyzed using the one-way ANOVA and Tukey test, and the data of the fracture pattern were analyzed using Fisher's exact test ( < 0.05).
The fracture resistance was significantly higher in Group B (Ni-Cr) than in Group C (PEEK) ( = 0.001) and Group A (fiberglass) ( < 0.001). Moreover, the fracture resistance was higher in Group C (PEEK) than in Group A (fiberglass) but was not statistically significant ( = 0.405). The fracture pattern was different in all the groups based on the types of fracture ( = 0.009) and the repairability of fracture ( = 0.036).
The present study showed that the fracture resistance was significantly higher in the Ni-Cr post than in the fiberglass and PEEK posts. Further, the fracture mode was more repairable in teeth restored with the PEEK post, as compared to the other posts.
对于牙髓治疗后的牙齿，哪种材料更适合桩核修复系统尚不清楚。本研究旨在比较三种不同桩核系统的抗折性能。
本研究中，33颗拔除的前磨牙经牙髓治疗后分为三组，即（A）预成玻璃纤维桩复合树脂核组、（B）镍铬铸造桩核组和（C）聚醚醚酮（PEEK）桩核组。桩黏固后，用镍铬冠修复核。通过万能试验机评估桩的抗折性能。此外，通过X线摄影确定骨折类型，并通过切割丙烯酸树脂盒进行客观确认。抗折性能数据采用单因素方差分析和Tukey检验进行分析，骨折类型数据采用Fisher精确检验进行分析（<0.05）。
B组（镍铬）的抗折性能显著高于C组（PEEK）（=0.001）和A组（玻璃纤维）（<0.001）。此外，C组（PEEK）的抗折性能高于A组（玻璃纤维），但差异无统计学意义（=0.405）。基于骨折类型（=0.009）和骨折可修复性（=0.036），所有组的骨折类型均不同。
本研究表明，镍铬桩的抗折性能显著高于玻璃纤维桩和PEEK桩。此外，与其他桩相比，用PEEK桩修复的牙齿骨折模式更易于修复。
