Abutment Design for Implant-Supported Indirect Composite Molar Crowns: Reliability and Fractography

Estevam Augusto Bonfante, Marcelo Suzuki, William Lubelski, Van P. Thompson, Ricardo Marins de Carvalho, Lukasz Witek, Paulo Coelho

Research output: Contribution to journalArticle

Abstract

Purpose: To investigate the reliability of titanium abutments veneered with indirect composites for implant-supported crowns and the possibility to trace back the fracture origin by qualitative fractographic analysis. Materials and Methods: Large base (LB) (6.4-mm diameter base, with a 4-mm high cone in the center for composite retention), small base (SB-4) (5.2-mm base, 4-mm high cone), and small base with cone shortened to 2 mm (SB-2) Ti abutments were used. Each abutment received incremental layers of indirect resin composite until completing the anatomy of a maxillary molar crown. Step-stress accelerated-life fatigue testing (n = 18 each) was performed in water. Weibull curves with use stress of 200 N for 50,000 and 100,000 cycles were calculated. Probability Weibull plots examined the differences between groups. Specimens were inspected in light-polarized and scanning electron microscopes for fractographic analysis. Results: Use level probability Weibull plots showed Beta values of 0.27 for LB, 0.32 for SB-4, and 0.26 for SB-2, indicating that failures were not influenced by fatigue and damage accumulation. The data replotted as Weibull distribution showed no significant difference in the characteristic strengths between LB (794 N) and SB-4 abutments (836 N), which were both significantly higher than SB-2 (601 N). Failure mode was cohesive within the composite for all groups. Fractographic markings showed that failures initiated at the indentation area and propagated toward the margins of cohesively failed composite. Conclusions: Reliability was not influenced by abutment design. Qualitative fractographic analysis of the failed indirect composite was feasible.

Original languageEnglish (US)
Pages (from-to)596-603
Number of pages8
JournalJournal of Prosthodontics
Volume21
Issue number8
DOIs
StatePublished - Dec 2012

Fingerprint

Crowns
Fatigue
Composite Resins
Titanium
Psychological Stress
Anatomy
Electrons
Light
Water

Keywords

  • Crowns
  • Fatigue
  • Fractography
  • Implants
  • Indirect composites
  • Reliability
  • Weibull

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Abutment Design for Implant-Supported Indirect Composite Molar Crowns : Reliability and Fractography. / Bonfante, Estevam Augusto; Suzuki, Marcelo; Lubelski, William; Thompson, Van P.; de Carvalho, Ricardo Marins; Witek, Lukasz; Coelho, Paulo.

In: Journal of Prosthodontics, Vol. 21, No. 8, 12.2012, p. 596-603.

Research output: Contribution to journalArticle

Bonfante, Estevam Augusto ; Suzuki, Marcelo ; Lubelski, William ; Thompson, Van P. ; de Carvalho, Ricardo Marins ; Witek, Lukasz ; Coelho, Paulo. / Abutment Design for Implant-Supported Indirect Composite Molar Crowns : Reliability and Fractography. In: Journal of Prosthodontics. 2012 ; Vol. 21, No. 8. pp. 596-603.
@article{5c579432bd38438ab149f5bfe3d40039,
title = "Abutment Design for Implant-Supported Indirect Composite Molar Crowns: Reliability and Fractography",
abstract = "Purpose: To investigate the reliability of titanium abutments veneered with indirect composites for implant-supported crowns and the possibility to trace back the fracture origin by qualitative fractographic analysis. Materials and Methods: Large base (LB) (6.4-mm diameter base, with a 4-mm high cone in the center for composite retention), small base (SB-4) (5.2-mm base, 4-mm high cone), and small base with cone shortened to 2 mm (SB-2) Ti abutments were used. Each abutment received incremental layers of indirect resin composite until completing the anatomy of a maxillary molar crown. Step-stress accelerated-life fatigue testing (n = 18 each) was performed in water. Weibull curves with use stress of 200 N for 50,000 and 100,000 cycles were calculated. Probability Weibull plots examined the differences between groups. Specimens were inspected in light-polarized and scanning electron microscopes for fractographic analysis. Results: Use level probability Weibull plots showed Beta values of 0.27 for LB, 0.32 for SB-4, and 0.26 for SB-2, indicating that failures were not influenced by fatigue and damage accumulation. The data replotted as Weibull distribution showed no significant difference in the characteristic strengths between LB (794 N) and SB-4 abutments (836 N), which were both significantly higher than SB-2 (601 N). Failure mode was cohesive within the composite for all groups. Fractographic markings showed that failures initiated at the indentation area and propagated toward the margins of cohesively failed composite. Conclusions: Reliability was not influenced by abutment design. Qualitative fractographic analysis of the failed indirect composite was feasible.",
keywords = "Crowns, Fatigue, Fractography, Implants, Indirect composites, Reliability, Weibull",
author = "Bonfante, {Estevam Augusto} and Marcelo Suzuki and William Lubelski and Thompson, {Van P.} and {de Carvalho}, {Ricardo Marins} and Lukasz Witek and Paulo Coelho",
year = "2012",
month = "12",
doi = "10.1111/j.1532-849X.2012.00872.x",
language = "English (US)",
volume = "21",
pages = "596--603",
journal = "Journal of Prosthodontics",
issn = "1059-941X",
publisher = "Wiley-Blackwell",
number = "8",

}

TY - JOUR

T1 - Abutment Design for Implant-Supported Indirect Composite Molar Crowns

T2 - Reliability and Fractography

AU - Bonfante, Estevam Augusto

AU - Suzuki, Marcelo

AU - Lubelski, William

AU - Thompson, Van P.

AU - de Carvalho, Ricardo Marins

AU - Witek, Lukasz

AU - Coelho, Paulo

PY - 2012/12

Y1 - 2012/12

N2 - Purpose: To investigate the reliability of titanium abutments veneered with indirect composites for implant-supported crowns and the possibility to trace back the fracture origin by qualitative fractographic analysis. Materials and Methods: Large base (LB) (6.4-mm diameter base, with a 4-mm high cone in the center for composite retention), small base (SB-4) (5.2-mm base, 4-mm high cone), and small base with cone shortened to 2 mm (SB-2) Ti abutments were used. Each abutment received incremental layers of indirect resin composite until completing the anatomy of a maxillary molar crown. Step-stress accelerated-life fatigue testing (n = 18 each) was performed in water. Weibull curves with use stress of 200 N for 50,000 and 100,000 cycles were calculated. Probability Weibull plots examined the differences between groups. Specimens were inspected in light-polarized and scanning electron microscopes for fractographic analysis. Results: Use level probability Weibull plots showed Beta values of 0.27 for LB, 0.32 for SB-4, and 0.26 for SB-2, indicating that failures were not influenced by fatigue and damage accumulation. The data replotted as Weibull distribution showed no significant difference in the characteristic strengths between LB (794 N) and SB-4 abutments (836 N), which were both significantly higher than SB-2 (601 N). Failure mode was cohesive within the composite for all groups. Fractographic markings showed that failures initiated at the indentation area and propagated toward the margins of cohesively failed composite. Conclusions: Reliability was not influenced by abutment design. Qualitative fractographic analysis of the failed indirect composite was feasible.

AB - Purpose: To investigate the reliability of titanium abutments veneered with indirect composites for implant-supported crowns and the possibility to trace back the fracture origin by qualitative fractographic analysis. Materials and Methods: Large base (LB) (6.4-mm diameter base, with a 4-mm high cone in the center for composite retention), small base (SB-4) (5.2-mm base, 4-mm high cone), and small base with cone shortened to 2 mm (SB-2) Ti abutments were used. Each abutment received incremental layers of indirect resin composite until completing the anatomy of a maxillary molar crown. Step-stress accelerated-life fatigue testing (n = 18 each) was performed in water. Weibull curves with use stress of 200 N for 50,000 and 100,000 cycles were calculated. Probability Weibull plots examined the differences between groups. Specimens were inspected in light-polarized and scanning electron microscopes for fractographic analysis. Results: Use level probability Weibull plots showed Beta values of 0.27 for LB, 0.32 for SB-4, and 0.26 for SB-2, indicating that failures were not influenced by fatigue and damage accumulation. The data replotted as Weibull distribution showed no significant difference in the characteristic strengths between LB (794 N) and SB-4 abutments (836 N), which were both significantly higher than SB-2 (601 N). Failure mode was cohesive within the composite for all groups. Fractographic markings showed that failures initiated at the indentation area and propagated toward the margins of cohesively failed composite. Conclusions: Reliability was not influenced by abutment design. Qualitative fractographic analysis of the failed indirect composite was feasible.

KW - Crowns

KW - Fatigue

KW - Fractography

KW - Implants

KW - Indirect composites

KW - Reliability

KW - Weibull

UR - http://www.scopus.com/inward/record.url?scp=84871607919&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84871607919&partnerID=8YFLogxK

U2 - 10.1111/j.1532-849X.2012.00872.x

DO - 10.1111/j.1532-849X.2012.00872.x

M3 - Article

C2 - 22672650

AN - SCOPUS:84871607919

VL - 21

SP - 596

EP - 603

JO - Journal of Prosthodontics

JF - Journal of Prosthodontics

SN - 1059-941X

IS - 8

ER -