Reliability and failure modes of anterior single-unit implant-supported restorations

Amilcar C. Freitas, Estevam A. Bonfante, Leandro M. Martins, Nelson R F A Silva, Leonard Marotta, Paulo Coelho

Research output: Contribution to journalArticle

Abstract

Purpose: Failures of implant-abutment connections have been observed clinically, especially in single-tooth replacements. This study sought to evaluate the reliability and failure modes of implant-supported anterior crowns restored with different implant systems. Materials and methods: Forty-two Ti-6Al-4V dental implants (~4 mm diameter) were used for single anterior crown replacement and divided into two groups according to tested system: (NB) Replace Select system, Nobel Biocare (n = 21); and (IL) Internal connection system, Intra-Lock International (n = 21). Proprietary abutments were screwed to the implants and anatomically correct maxillary central incisor metal crowns were cemented and subjected to step-stress-accelerated life testing in water. Use-level probability Weibull curves and reliability for a mission of 50,000 cycles at 200 N (95% 2-sided confidence intervals) were calculated. Polarized-light and scanning electron microscopes were used for failure analyses. Results: The Beta values for NB and IL (2.09 and 2.05, respectively) indicated that fatigue accelerated the failure of both groups. The calculated reliability for the NB system (0.81) was lower than for the IL system (0.96), but no significant difference was observed between groups. Screw and abutment fracture was the chief failure mode in group NB, while screw fracture was most representative in specimens of group IL. Conclusions: Reliability of implant-supported maxillary central incisor crowns was not significantly different between NB and IL abutments. Failure modes differed between implant systems.

Original languageEnglish (US)
Pages (from-to)1005-1011
Number of pages7
JournalClinical Oral Implants Research
Volume23
Issue number9
DOIs
StatePublished - Sep 2012

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Crowns
Incisor
Dental Implants
Psychological Stress
Fatigue
Tooth
Metals
Electrons
Confidence Intervals
Light
Water

Keywords

  • Abutment
  • Dental implants
  • Fractography
  • Reliability
  • Step-stress-accelerated life testing

ASJC Scopus subject areas

  • Oral Surgery

Cite this

Reliability and failure modes of anterior single-unit implant-supported restorations. / Freitas, Amilcar C.; Bonfante, Estevam A.; Martins, Leandro M.; Silva, Nelson R F A; Marotta, Leonard; Coelho, Paulo.

In: Clinical Oral Implants Research, Vol. 23, No. 9, 09.2012, p. 1005-1011.

Research output: Contribution to journalArticle

Freitas, Amilcar C. ; Bonfante, Estevam A. ; Martins, Leandro M. ; Silva, Nelson R F A ; Marotta, Leonard ; Coelho, Paulo. / Reliability and failure modes of anterior single-unit implant-supported restorations. In: Clinical Oral Implants Research. 2012 ; Vol. 23, No. 9. pp. 1005-1011.
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AB - Purpose: Failures of implant-abutment connections have been observed clinically, especially in single-tooth replacements. This study sought to evaluate the reliability and failure modes of implant-supported anterior crowns restored with different implant systems. Materials and methods: Forty-two Ti-6Al-4V dental implants (~4 mm diameter) were used for single anterior crown replacement and divided into two groups according to tested system: (NB) Replace Select system, Nobel Biocare (n = 21); and (IL) Internal connection system, Intra-Lock International (n = 21). Proprietary abutments were screwed to the implants and anatomically correct maxillary central incisor metal crowns were cemented and subjected to step-stress-accelerated life testing in water. Use-level probability Weibull curves and reliability for a mission of 50,000 cycles at 200 N (95% 2-sided confidence intervals) were calculated. Polarized-light and scanning electron microscopes were used for failure analyses. Results: The Beta values for NB and IL (2.09 and 2.05, respectively) indicated that fatigue accelerated the failure of both groups. The calculated reliability for the NB system (0.81) was lower than for the IL system (0.96), but no significant difference was observed between groups. Screw and abutment fracture was the chief failure mode in group NB, while screw fracture was most representative in specimens of group IL. Conclusions: Reliability of implant-supported maxillary central incisor crowns was not significantly different between NB and IL abutments. Failure modes differed between implant systems.

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