Digitally Produced Fiber-Reinforced Composite Substructures for Three-Unit Implant-Supported Fixed Dental Prostheses

Autor(es)

Bonfante, Estevam A. ^[1] ; Suzuki, Marcelo ^[2] ; Carvalho, Ricardo M. ^[3] ; Hirata, Ronaldo ^[4] ; Lubelski, Will ^[5] ; Bonfante, Gerson ^[6] ; Pegoraro, Thiago A. ^[7] ; Coelho, Paulo G. ^{[4, 8, 9]}

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Bauru Coll Dent, Dept Prosthodont, Sao Paulo - Brazil

^[2] Tufts Univ, Sch Dent Med, Dept Operat Dent & Prosthodont, Boston, MA 02111 - USA

^[3] Univ British Columbia, Fac Dent, Dept Oral Biol & Med Sci, Div Biomat, Vancouver, BC V5Z 1M9 - Canada

^[4] NYU, Dept Biomat & Biomimet, New York, NY - USA

^[5] Implant Dent Ctr, Engn & Res, Boston, MA - USA

^[6] Univ Sao Paulo, Bauru Coll Dent, Dept Prosthodont, Bauru, SP - Brazil

^[7] Univ Sagrado Coracao, Dept Oral Implantol, Bauru, SP - Brazil

^[8] NYU, Coll Dent, Dept Periodontol & Implant Dent, New York, NY - USA

^[9] New York Univ Abu Dhabi, Div Engn, Abu Dhabi - U Arab Emirates

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF ORAL & MAXILLOFACIAL IMPLANTS; v. 30, n. 2, p. 321-329, MAR-APR 2015.
• Citações Web of Science: 6

Resumo

This study aimed to evaluate the probability of survival, Weibull modulus, characteristic strength, and failure modes of computer-aided design/computer-assisted manufacture (CAD/CAM) fiber-reinforced composite (FRC) substructures used for implant-supported fixed dental prostheses (ISFDPs). Materials and Methods: Three-unit ISFDPs (first molar pontic) fabricated as a monolithic composite piece or as composite veneered on a CAD/CAM FRC substructure with either a 12-mm(2) or 3-mm(2) connector area (n = 18 each) were subjected to step-stress accelerated life testing in water. Use-level probability Weibull curves and the probability of survival were calculated. Fractographic analysis was performed under polarized light and scanning electron microscopy. Results: Fatigue did not accelerate the failure of any group, whereas prosthesis strength was the main factor in increased failure (beta < 1). The probability Weibull contour plot showed no differences between the ISFDPs with 12 mm(2) and the monolithic composite ISFDP in characteristic strength (eta = 643.5 N and 742.7 N, respectively) or Weibull modulus (6.7 and 5.8, respectively), whereas both were significantly higher than 3 mm(2) (444.91 N and 9.57). The probability of survival was not statistically different between groups at 100,000 mission cycles at 300 N. Differences were observed in fatigue failures above 800 N; monolithic composite ISFDPs failed catastrophically, whereas those with CAD/CAM FRC substructures presented veneer/composite cohesive or adhesive failures. Cracks evolved from the occlusal contact toward the margins of the cohesively failed composite, and in CAD/CAM FRC prostheses, competing failure modes of cracks developing at the connector area with those at the indentation contact were observed. Conclusion: The probability of survival did not differ between CAD/CAM FRC with either 3-mm(2) or 12-mm(2) connector areas, monolithic composite, or metal-ceramic ISFDPs previously tested under the same methodology. However, differences in failure modes were detected between groups. (AU)

• Processo FAPESP: 10/06152-9 - Confiabilidade e modos de fratura de próteses fixas em compósitos indiretos com e sem infra-estrutura CAD/CAM sobre implantes
• Beneficiário: Estevam Augusto Bonfante
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado