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VOLUME 20 , ISSUE 1 ( January, 2019 ) > List of Articles
Keywords : One-piece post and core,Fiber reinforced composite,High-density polymer,Fracture resistance,Laboratory test
Citation Information : Fracture Resistance and Failure Pattern of Endodontically Treated Teeth Restored with Computer-aided Design/ Computer-aided Manufacturing Post and Cores: A Pilot Study. J Contemp Dent Pract 2019; 20 (1):56-63.
License: CC BY-NC 4.0
Published Online: 01-12-2018
Copyright Statement: Copyright © 2019; The Author(s).
Aim: To evaluate the fracture resistance and failure pattern of custom made computer-aided design & computer-aided manufacturing (CAD/CAM) post and cores using a fiber reinforced composite material (FRC) and a high-density-polymer.
Materials and methods: Thirty extracted mandibular second premolars were selected, endodontically treated and prepared to receive the posts. The specimens were randomly divided into three groups (n = 10) according to each material: group 1 (RXP) : fiber posts (Rely X, 3M-ESPE) with composite core build-up (Filtek Bulk Fill Posterior, 3M-ESPE) as a control group; group 2 (BLC): one-piece milled post and core from fiber reinforced composite blocks (Trilor, Bioloren); and group 3 (AMC): one-piece milled post and core from hybrid ceramic disks (Ambarino, Creamed). All the posts were cemented using a self-adhesive resin cement (Rely X U200, 3M ESPE). Fracture resistance was tested using a universal testing machine, failure patterns were then observed visually and radiographically then evaluated under SEM. Data was analyzed using One-way analysis of variance (ANOVA) followed by Tamhane post-hoc test in order to determine significant differences among groups (α = 0.05).
Results: The mean fracture resistance values were: 426.08 ± 128.26 N for group 1 (R X P), 367.06 ± 72.34N for group 2 (BLC), and 620.02 ± 5 4.29N f or g roup 3 ( AMC). S tatistical analysis revealed that group 3 (AMC) had the highest mean load to fracture in comparison to the other groups (p = 0.000). failures were cohesive in group 2 and 3 and mixed in group 1 with no catastrophic failures reported in all groups.
Conclusion: All systems evaluated presented sufficient mean load-to-failure values for endodontically treated teeth restorations.CAD/CAM post and cores made from high-density-polymer showed a better performance than prefabricated fiber posts.