Fracture resistance of cantilevered full-arch implant-supported hybrid prostheses with carbon fiber frameworks after thermal cycling. (January 2022)

• Record Type: Journal Article
• Authors: Haroyan-Darbinyan, Evelina; Romeo-Rubio, Marta; Río-Highsmith, Jaime Del; Lynch, Christopher D.; Castillo-Oyagüe, Raquel
• Is Part Of: Journal of dentistry. Volume 116(2022)
• Publication Date: 2022-01
• Subjects: Full-arch implant-supported hybrid prostheses -- Cantilever -- Prosthetic frameworks -- Carbon fiber -- Cobalt-chromium -- Resin veneering; Dentistry -- Periodicals; Dentistry -- Periodicals; Dentisterie -- Périodiques; Electronic journals; 617.6005
• DOI: 10.1016/j.jdent.2021.103902
• Languages: English
• ISSNs: 0300-5712

Abstract

Abstract: Objectives: This in vitro study aimed to find the best combination of mesostructure and veneering materials for full-arch implant-supported hybrid prostheses (HPs) in terms of the fracture resistance (FR) of their cantilevers. Methods: Three groups ( n = 5 each) of maxillary HPs were fabricated: Group-1 (CC-A, control ): Co-Cr frameworks coated with acrylic resin; Group-2 (CF-A): carbon fiber veneered with acrylic resin; and Group-3 (CF-R): carbon fiber coated with composite resin. All specimens were submitted to 5, 000 thermal cycles (5 °C – 55 °C, dwell time: 30 s), and subjected to a single cantilever bending test in a universal testing machine (crosshead speed: 0.5 mm/min) until failure. The fracture pattern was assessed using stereo microscope and SEM. The one-way ANOVA and Bonferroni tests were run ( α = 0.05). Results: The FR yielded significant differences among the three groups ( p < 0.001). CC-A samples reached the highest FR values ( p ≤ 0.001), whereas both CF-A and CF-R HPs exhibited the comparably ( p = 0.107) lowest FR. CC-A specimens failed cohesively (100%): mostly without chipping (80%). CF-A mesostructures were always broken at the connections of the distal implants. CF-R prostheses often failed adhesively (80%). Conclusions: The HPs made of Co-Cr veneered with acrylic demonstrated the best mechanical behavior, being the only group whose 13-mm long cantilevers exceeded the clinically acceptable FR of 900 N. The HPs constructed with carbon fiber frameworks showed, additionally, more unfavorable fracture patterns. Clinical significance: For HPs with cantilevers up to 13 mm, Co-Cr mesostructures coated with acrylic may represent the optimum combination of materials.