Effect of implant connection and restoration design (screwed vs. cemented) in reliability and failure modes of anterior crowns

Amilcar C. Freitas, Estevam A. Bonfante, Eduardo P. Rocha, Nelson R F A Silva, Leonard Marotta, Paulo Coelho

Research output: Contribution to journalArticle

Abstract

The mechanical performance of cemented or screw-retained implant-supported crowns with an internal or external configuration is yet to be understood. This in vitro study evaluated the effect of screw-retained and cement-retained prostheses on internal and external implant-abutment connections. Thereby, the reliability and failure modes of crowns were investigated. Eighty-four implants (Emfils; Colosso Evolution system) were divided into four groups (n=21 each): screw-retained and internal connection (Si), screw-retained and external connection (Se), cement-retained and internal connection (Ci), and cement-retained and external connection (Ce). Ti-6Al-4V abutments were torqued (30Ncm) to the implants, and maxillary central incisor metal crowns were torqued (30Ncm) or cemented (Rely X Unicem; 3M-ESPE) and subjected to accelerated life-testing in water. Use-level probability Weibull curves and reliability for 50,000 cycles at 150 N were calculated. The β values for Si (1.72), Se (1.50), Ci (1.34), and Ce (1.77) groups indicated that fatigue/damage accumulation accelerated their failure. The Ci group presented the highest reliability, the Se group presented the lowest reliability, and Si and Ce groups presented intermediate reliability. Screw-retained restorations presented mainly abutment fracture. Cement-retained restorations resulted in failures of the screw in the Ce group, but implant/screw fracture in the Ci group.

Original languageEnglish (US)
Pages (from-to)323-330
Number of pages8
JournalEuropean Journal of Oral Sciences
Volume119
Issue number4
DOIs
StatePublished - Aug 2011

Fingerprint

Crowns
Incisor
Prostheses and Implants
Fatigue
Metals
Water

Keywords

  • Cement-retained
  • Fractography
  • Implant-supported prostheses
  • Reliability
  • Screw-retained

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Effect of implant connection and restoration design (screwed vs. cemented) in reliability and failure modes of anterior crowns. / Freitas, Amilcar C.; Bonfante, Estevam A.; Rocha, Eduardo P.; Silva, Nelson R F A; Marotta, Leonard; Coelho, Paulo.

In: European Journal of Oral Sciences, Vol. 119, No. 4, 08.2011, p. 323-330.

Research output: Contribution to journalArticle

Freitas, Amilcar C. ; Bonfante, Estevam A. ; Rocha, Eduardo P. ; Silva, Nelson R F A ; Marotta, Leonard ; Coelho, Paulo. / Effect of implant connection and restoration design (screwed vs. cemented) in reliability and failure modes of anterior crowns. In: European Journal of Oral Sciences. 2011 ; Vol. 119, No. 4. pp. 323-330.
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