Effect of abutment screw surface treatment on reliability of implant-supported crowns.

Rodolfo Bruniera Anchieta, Lucas Silveira Machado, Estevam Augusto Bonfante, Ronaldo Hirata, Amilcar Chagas Freitas, Paulo Coelho

Research output: Contribution to journalArticle

Abstract

To evaluate and compare the reliability of implant-supported single crowns cemented onto abutments retained with coated (C) or noncoated (NC) screws and onto platform-switched abutments with coated screws. Fifty-four implants (DT Implant 4-mm Standard Platform, Intra-Lock International) were divided into three groups (n = 18 each) as follows: matching-platform abutments secured with noncoated abutment screws (MNC); matching-platform abutments tightened with coated abutment screws (MC); and switched-platform abutments secured with coated abutment screws (SC). Screws were characterized by scanning electron microscopy and x-ray photoelectron spectroscopy (XPS). The specimens were subjected to step-stress accelerated life testing. Use-level probability Weibull curves and reliability for 100,000 cycles at 200 N and 300 N (90% two-sided confidence intervals) were calculated. Polarized light and scanning electron microscopes were used for fractographic analysis. Scanning electron microscopy revealed differences in surface texture; noncoated screws presented the typical machining grooves texture, whereas coated screws presented a plastically deformed surface layer. XPS revealed the same base components for both screws, with the exception of higher degrees of silicon in the SiO2 form for the coated samples. For 100,000 cycles at 300 N, reliability values were 0.06 (0.01 to 0.16), 0.25 (0.09 to 0.45), and 0.25 (0.08 to 0.45), for MNC, MC, and SC, respectively. The most common failure mechanism for MNC was fracture of the abutment screw, followed by bending, or its fracture, along with fracture of the abutment or implant. Coated abutment screws most commonly fractured along with the abutment, irrespective of abutment type. Reliability was higher for both groups with the coated screw than with the uncoated screw. Failure modes differed between coated and uncoated groups.

Original languageEnglish (US)
Pages (from-to)585-592
Number of pages8
JournalThe International journal of oral & maxillofacial implants
Volume29
Issue number3
StatePublished - 2014

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Photoelectron Spectroscopy
Crowns
Electron Scanning Microscopy
X-Rays
Silicon
Psychological Stress
Electrons
Confidence Intervals
Light
Therapeutics

ASJC Scopus subject areas

  • Medicine(all)

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Effect of abutment screw surface treatment on reliability of implant-supported crowns. / Anchieta, Rodolfo Bruniera; Machado, Lucas Silveira; Bonfante, Estevam Augusto; Hirata, Ronaldo; Freitas, Amilcar Chagas; Coelho, Paulo.

In: The International journal of oral & maxillofacial implants, Vol. 29, No. 3, 2014, p. 585-592.

Research output: Contribution to journalArticle

Anchieta, RB, Machado, LS, Bonfante, EA, Hirata, R, Freitas, AC & Coelho, P 2014, 'Effect of abutment screw surface treatment on reliability of implant-supported crowns.', The International journal of oral & maxillofacial implants, vol. 29, no. 3, pp. 585-592.
Anchieta, Rodolfo Bruniera ; Machado, Lucas Silveira ; Bonfante, Estevam Augusto ; Hirata, Ronaldo ; Freitas, Amilcar Chagas ; Coelho, Paulo. / Effect of abutment screw surface treatment on reliability of implant-supported crowns. In: The International journal of oral & maxillofacial implants. 2014 ; Vol. 29, No. 3. pp. 585-592.
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