Assessment of Fracture Resistance of PEEK and Fibre Posts of the Endodontically Treated Teeth

Abstract

This in vitro study aimed to compare the fracture resistance between pressed custom-made polyetheretherketone (PEEK) post and core and fibre reinforced post and composite core. A total of 40 single rooted extracted teeth were selected, endodontically treated, and prepared to receive the posts. Specimens were randomly divided into two main groups (n=20/group): group 1, (PEEK); group 2, fibre post. PEEK post was manufactured with a computer-aided design/computer-aided manufacturing system further divided into four sub groups (P7, P12, F7, F12) based on lengths 7 and 12 mm at which the posts were cemented. All posts were cemented with self-adhesive resin cement, and specimens were stored in 0.1% thymol solution during the experiment at all the times except during preparation and testing. A universal testing machine was used to measure the fracture resistance. The fracture resistance values (mean and SD, in newtons) were 1255N (P7), 1562N (P12), 1065N (F7), and 1384N (F12). Only P12 exhibited a significant difference (p,0.05). The turkey test showed an association between failure mode and post and- core material. In the remaining groups, most failures were nonrepairable and related to fracture. Customized post-and-cores of PEEK exhibited good mechanical performance. Their fracture resistance was comparable to that observed for fibre posts.

Investigation of Fracture Strength of Current Post Materials (Peek, Fiber, Cast Metal) in Different Ferrule Conditions

“…In a study reporting similar results, the fracture resistance values of glass fiber and PEEK posts were compared. According to the study results, the fracture resistance of PEEK posts was found to be statistically higher [34]. Unlike the findings of our study, some studies report that the fracture resistance of PEEK posts is significantly lower compared to glass fiber posts [35].…”

“…Whereas there is a consensus in the literature that the fracture resistance of PEEK posts is lower compared to metal posts under conditions without the ferrule effect, studies on the fracture resistance of PEEK and glass fiber posts report different results [34]. According to the findings of our research, there is no significant difference in terms of fracture resistance between the glass fiber and PEEK post groups without ferrule preparation.…”

Fracture Resistance and Failure Mode of Three Esthetic Cad-cam Post and Core Restorations

“…In the present study, the exclusion of crown fabrication aimed to amplify the effect of post and core materials in the assessment of fracture resistance of endodontically treated teeth. [41][42][43][44] On the other hand, studies [40,60,61] that used a crown or coping to cover post and core restorations had fracture resistance higher than the current study, however, this might conceal the actual differences between the used custom made post and core materials. Thermal and mechanical aging have signi cant impacts on the bonding and fracture resistance of endodontically treated teeth restored with post and core restorations.…”

“…[62,63]. Moreover, several studies [9,30,42,47,55,64] refrained from conducting arti cial aging, emphasizing that their investigations were speci cally focused on the materials and methodology rather than projecting outcomes under different conditions.…”

“…This ensured the full seating of the restorations and the creation of a uniform cement lm thickness [9]. In this study, crown fabrication was not employed due to the acknowledged effect of crowns in augmenting fracture resistance values [39,[41][42][43][44]. The main aim of this research was to amplify the focus on the intrinsic behavior of the materials themselves.…”