J Prosthodont. 2023 Apr 28. doi: 10.1111/jopr.13694. Online ahead of print.
ABSTRACT
PURPOSE: To compare the fracture resistance and failure modes of anterior cantilever resin-bonded fixed partial dentures (RBFPDs) fabricated from high translucency zirconia with different intaglio surface treatments.
MATERIALS AND METHODS: Sound-extracted canines (N = 50) were randomly divided into five groups (n = 10), to be restored with high translucency zirconia RBFBDs of different intaglio surface treatments. The RBFPD was designed using an exocad software and fabricated using a CAM milling machine. The RBFPDs were treated differently. Abrasion with 50μm alumina particles (Group 1); abrasion with 30μm silica-coated alumina particles (Group 2); abrasion with silica-coated alumina particles (30μm) and silane application (Group 3); abrasion with silica coated alumina particles (30μm) and 10-MDP primer application (Group 4); abrasion with silica-coated alumina particles (30μm) and silane, and 10-MDP primer application. All RBFPDs were cemented using dual-cured resin cement. The RBFPDs underwent 6000 thermal cycles with distilled water at 5°C/55°C for 2 minutes per cycle and then mechanical cyclic loading with 1,200,000 cycles of 50 N at a 1.7Hz frequency at an angle of 135° to the abutment’s long axis. Then, RBFPDs were loaded to fracture using a universal testing machine at 1mm/min. Maximum fracture forces and failure modes were recorded. Fractured specimens and uncemented specimens were examined using a scanning electron microscope. Data were analyzed using ANOVA and Games-Howell post hoc tests at P<0.05.
RESULTS: Mean fracture load results showed a statistically significant difference between the research groups (P<0.0001) and it ranged from 69.78-584 N. Group 4 exhibited the highest fracture load mean (P < 0.0001) which was significantly different from all other groups. Group 2 recorded a significantly higher fracture load mean than Group 3 (P = 0.029). Three modes of failure were observed; prosthesis debonding, prosthesis fracture, and abutment fracture.
CONCLUSIONS: Abrasion of zirconia surface with 30μm silica-coated alumina particles and application of 10-MDP primer yielded the highest mean fracture loads of monolithic high translucency zirconia RBFPD. The mode of fracture of the RBFPDs was influenced by the type of surface treatments. This article is protected by copyright. All rights reserved.
PMID:37114526 | DOI:10.1111/jopr.13694
