Abstract
(1) Background: To analyze the fracture resistance of endodontically upper premolar teeth restored with glass fiber reinforced posts, glass fiber elastic posts, conventional composite resin (CR) and glass fiber reinforced composite (FRC) resins as restorations. (2) Methods: Seventy premolars were submitted to root canal treatment and restored with the following restorative materials (n = 10): A. FRC posts restored with resin; B. Elastic FRC posts restored with resin; C. FRC posts restored with FRC resin; D. Elastic FRC posts restored with FRC resin; E. Direct restoration with resin; F. Direct restoration with FRC resin; G. Untreated teeth. The teeth were embedded in an epoxy resin model, thermal cycling fatigued in distilled water and mechanical cycling fatigued inducing 80 N load. Loading was applied axially on the center of the occlusal surface with a vertical displacement. The fracture was produced by a universal machine at a crosshead speed of 0.5 mm/s with a 5000 N load cell. The results were analyzed by ANOVA and Tukey’s test and Weibull characteristic strength and modulus were calculated. (3) Results: The group that obtained the greatest fracture resistance was D (3620 ± 470 N) and the least resistant was group A (2420 ± 1010 N). Statistically significant differences were observed between the groups restored with Elastic FRC posts-CR versus FRC post-CR and only CR (p = 0.043 and p = 0.008). (4) Conclusions: The glass fiber reinforced restorative materials increase the fracture resistance of endodontically treated teeth.
Highlights
Vital tooth behaves like an empty and laminated structure and the cusp morphology allows receiving functional loads, distributing them evenly without causing any damage [1].endodontically treated teeth present a different biomechanical behavior at different levels [2]
The aim of this work was to analyze and compare the fracture resistance of endodontically single-rooted first upper premolar teeth restored with glass FRC posts, FRC reinforced elastic posts, conventional composite resin and glass fiber reinforced composite resins as root canal treatment restorations, with a null hypothesis (H0), which states that the restoring materials tested has no statistically significant effect on the fracture resistance of endodontically treated tooth
The results obtained in the present study lead to the acceptation of the null hypothesis (H0), which states that the restoring materials tested has no statistically significant effect on the fracture resistance of endodontically treated teeth, there was statistically significant differences between elastic FRC post restored with composite resin (CR) (3510 N) and FRC post with CR (2420 N) and only CR
Summary
Vital tooth behaves like an empty and laminated structure and the cusp morphology allows receiving functional loads, distributing them evenly without causing any damage [1].endodontically treated teeth present a different biomechanical behavior at different levels [2]. When pulp is removed the protective feedback is lost [3], increasing the risk of fracture [4], due to the significant loss of the dental structure [5] during endodontic access to the pulp chamber and caries removal [6,7]. The absence of pulp tissue causes irreversible alterations in dentin, [6] reducing its wettability and the collagen content [8], affecting the Young’s elastic modulus of dentin and its proportional limit, in other words, the proportional limit determines the greatest stress that is directly proportional to strain The proportional limit is the point on a stress-strain curve where the linear, elastic deformation region transitions into a non-linear, plastic deformation region.
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