Biomechanical behavior of CAD/CAM cobalt-chromium and zirconia full-arch fixed prostheses
Barbin Thais, Del Rio Silva Leticia, Veloso Daniele Valente, Borges Guilherme Almeida, Presotto Anna Gabriella Camacho, Barao Valentim Adelino Ricardo, Groppo Francisco Carlos, Mesquita Marcelo Ferraz,
소속 상세정보
( Barbin Thais ) - State University of Campinas Piracicaba Dental School Department of Prosthodontics and Periodontology
( Del Rio Silva Leticia ) - State University of Campinas Piracicaba Dental School Department of Prosthodontics and Periodontology
( Veloso Daniele Valente ) - State University of Campinas Piracicaba Dental School Department of Prosthodontics and Periodontology
( Borges Guilherme Almeida ) - State University of Campinas Piracicaba Dental School Department of Prosthodontics and Periodontology
( Presotto Anna Gabriella Camacho ) - State University of Campinas Piracicaba Dental School Department of Prosthodontics and Periodontology
( Barao Valentim Adelino Ricardo ) - State University of Campinas Piracicaba Dental School Department of Prosthodontics and Periodontology
( Groppo Francisco Carlos ) - University of Campinas Piracicaba Dental School Department of Physiological Sciences
( Mesquita Marcelo Ferraz ) - State University of Campinas Piracicaba Dental School Department of Prosthodontics and Periodontology
Abstract
PURPOSE: To verify the influence of computer-aided design/computer-aided manufacturing (CAD/CAM) implant-supported prostheses manufactured with cobalt-chromium (Co-Cr) and zirconia (Zr), and whether ceramic application, spark erosion, and simulation of masticatory cycles modify biomechanical parameters (marginal fit, screw-loosening torque, and strain) on the implant-supported system.
MATERIALS AND METHODS: Ten full-arch fixed frameworks were manufactured by a CAD/CAM milling system with Co-Cr and Zr (n=5/group). The marginal fit between the abutment and frameworks was measured as stated by single-screw test. Screw-loosening torque evaluated screw stability, and strain analysis was explored on the implant-supported system. All analyses were performed at 3 distinct times: after framework manufacturing; after ceramic application in both materials' frameworks; and after the spark erosion in Co-Cr frameworks. Afterward, stability analysis was re-evaluated after 106 mechanical cycles (2 Hz/150-N) for both materials. Statistical analyses were performed by Kruskal-Wallis and Dunn tests (α=.05).
RESULTS: No difference between the two materials was found for marginal fit, screw-loosening torque, and strain after framework manufacturing (P>.05). Ceramic application did not affect the variables (P>.05). Spark erosion optimized marginal fit and strain medians for Co-Cr frameworks (P<.05). Screw-loosening torque was significantly reduced by masticatory simulation (P<.05) regardless of the framework materials.
CONCLUSION: Co-Cr and Zr frameworks presented similar biomechanical behavior. Ceramic application had no effect on the biomechanical behavior of either material. Spark erosion was an effective technique to improve Co-Cr biomechanical behavior on the implant-supported system. Screw-loosening torque was reduced for both materials after masticatory simulation.
키워드
Computer-aided design/computer-aided manufacturing (CAD/CAM); Dental marginal adaptation; Dental stress analysis; Implant-supported dental prostheses; Spark erosion
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