Digitally produced fiber-reinforced composite substructures for three-unit implant-supported fixed dental prostheses

Estevam A. Bonfante, Marcelo Suzuki, Ricardo M. Carvalho, Ronaldo Hirata, Will Lubelski, Gerson Bonfante, Thiago A. Pegoraro, Paulo Coelho

Research output: Contribution to journalArticle

Abstract

PURPOSE: 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-mm² or 3-mm² 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 (β <1). The probability Weibull contour plot showed no differences between the ISFDPs with 12 mm² and the monolithic composite ISFDP in characteristic strength (η = 643.5 N and 742.7 N, respectively) or Weibull modulus (6.7 and 5.8, respectively), whereas both were significantly higher than 3 mm² (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-mm² or 12-mm² connector areas, monolithic composite, or metal-ceramic ISFDPs previously tested under the same methodology. However, differences in failure modes were detected between groups.

Original languageEnglish (US)
Pages (from-to)321-329
Number of pages9
JournalThe International journal of oral & maxillofacial implants
Volume30
Issue number2
DOIs
StatePublished - Mar 1 2015

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Implant-Supported Dental Prosthesis
Computer-Aided Design
Fatigue
Prosthesis Failure
Fixed Partial Denture
Ceramics
Psychological Stress
Adhesives
Electron Scanning Microscopy
Prostheses and Implants
Metals
Light
Water

ASJC Scopus subject areas

  • Medicine(all)

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Digitally produced fiber-reinforced composite substructures for three-unit implant-supported fixed dental prostheses. / Bonfante, Estevam A.; Suzuki, Marcelo; Carvalho, Ricardo M.; Hirata, Ronaldo; Lubelski, Will; Bonfante, Gerson; Pegoraro, Thiago A.; Coelho, Paulo.

In: The International journal of oral & maxillofacial implants, Vol. 30, No. 2, 01.03.2015, p. 321-329.

Research output: Contribution to journalArticle

Bonfante, Estevam A. ; Suzuki, Marcelo ; Carvalho, Ricardo M. ; Hirata, Ronaldo ; Lubelski, Will ; Bonfante, Gerson ; Pegoraro, Thiago A. ; Coelho, Paulo. / Digitally produced fiber-reinforced composite substructures for three-unit implant-supported fixed dental prostheses. In: The International journal of oral & maxillofacial implants. 2015 ; Vol. 30, No. 2. pp. 321-329.
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AU - Bonfante, Estevam A.

AU - Suzuki, Marcelo

AU - Carvalho, Ricardo M.

AU - Hirata, Ronaldo

AU - Lubelski, Will

AU - Bonfante, Gerson

AU - Pegoraro, Thiago A.

AU - Coelho, Paulo

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N2 - PURPOSE: 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-mm² or 3-mm² 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 (β <1). The probability Weibull contour plot showed no differences between the ISFDPs with 12 mm² and the monolithic composite ISFDP in characteristic strength (η = 643.5 N and 742.7 N, respectively) or Weibull modulus (6.7 and 5.8, respectively), whereas both were significantly higher than 3 mm² (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-mm² or 12-mm² connector areas, monolithic composite, or metal-ceramic ISFDPs previously tested under the same methodology. However, differences in failure modes were detected between groups.

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