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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
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]
Total Authors: 8
Affiliation:
[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
Total Affiliations: 9
Document type: Journal article
Source: INTERNATIONAL JOURNAL OF ORAL & MAXILLOFACIAL IMPLANTS; v. 30, n. 2, p. 321-329, MAR-APR 2015.
Web of Science Citations: 6
Abstract

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)

FAPESP's process: 10/06152-9 - Reliability and fracture mode of fixed prosthesis made with indirect composites with and without CAD/CAM infrastructure over implant abutments
Grantee:Estevam Augusto Bonfante
Support Opportunities: Scholarships in Brazil - Post-Doctoral