Mechanical evaluation of four narrow-diameter implant systems.

Ronaldo Hirata, Estevam A. Bonfante, Lucas S. Machado, Nick Tovar, Paulo Coelho

Research output: Contribution to journalArticle

Abstract

This study aimed to evaluate the survival probability of four narrow-diameter implant systems when subjected to fatigue loading. Seventy-two narrow-diameter implants to be restored with single-unit crowns were divided into four groups (n = 18): Astra Tech (3.5-mm diameter), with a standard connection (ASC); BioHorizon (3.4-mm diameter), with a standard connection (BSC); Intra-Lock (3.4-mm diameter), with a standard multilobular connection (ISC); and Intra-Lock (3.4-mm diameter), with a modified square connection (IMC). The corresponding abutments were screwed onto the implants, and standardized metal crowns (maxillary central incisors) were cemented and subjected to step-stress accelerated life testing in water. Use-level probability Weibull curves and reliability for 100,000 cycles at 150 and 200 N (90% two-sided confidence intervals) were calculated. Polarized light and scanning electron microscopes were used to access the failure modes. The calculated survival probability for 100,000 cycles at 150 N was approximately 93% in group ASC, 98% in group BSC, 94% in group ISC, and 99% in group IMC. At 200 N, the survival rate was estimated to be approximately < 0.1% for ASC, 77% for BSC, 34% for ISC, and 93% for IMC. Abutment screw fracture was the main failure mode for all groups. Although the probability of survival was not significantly different among systems at a load of 150 N, a significant decrease was observed at 200 N for all groups except IMC.

Original languageEnglish (US)
Pages (from-to)359-362
Number of pages4
JournalInternational Journal of Prosthodontics
Volume27
Issue number4
DOIs
StatePublished - 2014

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Crowns
Incisor
Psychological Stress
Fatigue
Metals
Electrons
Confidence Intervals
Light
Water

ASJC Scopus subject areas

  • Oral Surgery

Cite this

Mechanical evaluation of four narrow-diameter implant systems. / Hirata, Ronaldo; Bonfante, Estevam A.; Machado, Lucas S.; Tovar, Nick; Coelho, Paulo.

In: International Journal of Prosthodontics, Vol. 27, No. 4, 2014, p. 359-362.

Research output: Contribution to journalArticle

Hirata, Ronaldo ; Bonfante, Estevam A. ; Machado, Lucas S. ; Tovar, Nick ; Coelho, Paulo. / Mechanical evaluation of four narrow-diameter implant systems. In: International Journal of Prosthodontics. 2014 ; Vol. 27, No. 4. pp. 359-362.
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