Effect of different composite core materials on fracture resistance of endodontically treated teeth restored with FRC posts

Abstract

Objective This study evaluated the fracture resistance of endodontically treated teeth restored with fiber reinforced composite posts, using three resin composite core build-up materials, (Clearfil Photo Core (CPC), MultiCore Flow (MCF), and LuxaCore Z-Dual (LCZ)), and a nanohybrid composite, (Tetric N-Ceram (TNC)).Material and Methods Forty endodontically treated lower first premolars were restored with quartz fiber posts (D.T. Light-Post) cemented with resin cement (Panavia F2.0). Samples were randomly divided into four groups (n=10). Each group was built-up with one of the four core materials following its manufacturers’ instructions. The teeth were embedded in acrylic resin blocks. Nickel-Chromium crowns were fixed on the specimens with resin cement. The fracture resistance was determined using a universal testing machine with a crosshead speed of 1 mm/min at 1350 to the tooth axis until failure occurred. All core materials used in the study were subjected to test for the flexural modulus according to ISO 4049:2009.Results One-way ANOVA and Bonferroni multiple comparisons test indicated that the fracture resistance was higher in the groups with CPC and MCF, which presented no statistically significant difference (p>0.05), but was significantly higher than in those with LCZ and TNC (p<0.05). In terms of the flexural modulus, the ranking from the highest values of the materials was aligned with the same tendency of fracture loads.Conclusion Among the cores used in this study, the composite core with high filler content tended to enhance fracture thresholds of teeth restored with fiber posts more than others.

Restoration Strategies of Endodontically Treated Teeth among Dental Practitioners in Saudi Arabia. A Nationwide Pilot Survey

“…This may be due to the fact that amalgam materials are still not considered as a health threat to the patient and have a good level of acceptability. In addition, resin-based composite core materials are more popular due to their chemical bond to the tooth structure and similarity to the tooth structure in terms of hardness and fracture toughness, offering the advantage that preparation can be performed after curing [ 37 ].…”

A new classification system for the restoration of root filled teeth

“…, Rödig et al . , Panitiwat & Salimee ). However, from a research perspective, it is important to note that the increased percentage of filler in these materials needed for core build‐up leads irreversibly to higher stress during polymerization, ultimately resulting in lower bond strength values (Ferrari et al .…”

Fracture resistance of tilted premolars restored with different post-core systems

“…These findings could be referred to the favorable biomechanical properties of fiber posts and composite cores. [ 29 30 ] Giovani et al [ 31 ] utilized the same concept to explain his supporting results. They reported that glass fiber posts with modulus of elasticity similar to dentin can absorb the stresses better, reducing the probability of catastrophic root fracture accordingly.…”

“…This feature can accordingly result in core failure in cases utilizing composite cores, while those utilizing cast post-core usually show root fracture. [ 26 29 40 ]…”