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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Preload loss and bacterial penetration on different implant-abutment connection systems

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Author(s):
Antônio Pedro Ricomini Filho [1] ; Frederico Silva de Freitas Fernandes [2] ; Fabiana Gouveia Straioto [3] ; Wander José da Silva [4] ; Altair Antoninha Del Bel Cury [5]
Total Authors: 5
Affiliation:
[1] State University of Campinas. Piracicaba Dental School. Department of Prosthodontics and Periodontology - Brasil
[2] State University of Campinas. Piracicaba Dental School. Department of Prosthodontics and Periodontology - Brasil
[3] State University of Campinas. Piracicaba Dental School. Department of Prosthodontics and Periodontology - Brasil
[4] State University of Campinas. Piracicaba Dental School. Department of Prosthodontics and Periodontology - Brasil
[5] State University of Campinas. Piracicaba Dental School. Department of Prosthodontics and Periodontology - Brasil
Total Affiliations: 5
Document type: Journal article
Source: Brazilian Dental Journal; v. 21, n. 2, p. 123-129, 2010-00-00.
Abstract

Preload loss can favor the occurrence of implant-abutment interface misfit, and bacterial colonization at this interface may lead to implant failure. The aim of this study was to evaluate the preload loss and bacterial penetration through the implant-abutment interface of conical and external hexagon connection systems subjected to thermal cycling and mechanical fatigue (TM). Four different implant-abutment connection systems were evaluated (n=6): external hexagon with universal post, Morse taper with universal post, Morse taper with universal post through bolt, and locking taper with standard abutment. The assemblies (implant-abutment) were subjected to a thermal cycling regimen (1,000 cycles of 5°C and 55°C) and to mechanical fatigue (1.0 million cycles, 1.0 Hz, 120 N). The assemblies were immersed in Tryptic Soy + Yeast Extract broth containing Streptococcus sanguinis and incubated at 37°C and 10% CO2 for 72 h. Detorque values were recorded. The bacterial penetration was assessed and the abutments were observed by scanning electron microscopy. The preload data were analyzed statistically by two-way ANOVA and Tukey’s test at 5% significance level. All screw abutment systems showed significantly higher (p<0.05) detorque values when subjected to TM and all conical systems presented bacterial penetration. The results show no relationship between the preload loss and the bacterial penetration. (AU)