Biomechanical behavior of CAD/CAM cobalt-chromium and zirconia full-arch fixed prostheses

Autor(es)

Barbin, Thais ^[1] ; Silva, Leticia Del Rio ^[1] ; Veloso, Daniele Valente ^[1] ; Borges, Guilherme Almeida ^[1] ; Camacho Presotto, Anna Gabriella ^[1] ; Ricardo Barao, Valentim Adelino ^[1] ; Groppo, Francisco Carlos ^[2] ; Mesquita, Marcelo Ferraz ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Prosthodont & Periodontol, Piracicaba - Brazil

^[2] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Physiol Sci, Piracicaba - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ADVANCED PROSTHODONTICS; v. 12, n. 6, p. 329-337, DEC 2020.
• Citações Web of Science: 0

Resumo

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 (alpha=.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. (AU)

• Processo FAPESP: 17/16303-3 - Estudo comparativo de técnicas de confecção de próteses totais fixas maxilares implantossuportadas: planejamento, materiais, desajuste, torque de afrouxamento, cobertura estética, ciclagem mecânica e distribuição de tensões
• Beneficiário: Marcelo Ferraz Mesquita
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/15297-0 - Estudo comparativo de técnicas de confecção de próteses totais fixas maxilares implantossuportadas tipo All-on-4: planejamento, materiais, desajuste, torque de afrouxamento, cobertura estética, ciclagem mecânica e distribuição de tensões
• Beneficiário: Thaís Barbin
• Modalidade de apoio: Bolsas no Brasil - Mestrado