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International Journal of Dentistry
Volume 2017 (2017), Article ID 3849085, 4 pages
Research Article

Microbiological Sealing Analysis of a Tapered Connection and External Hexagon System

São Leopoldo Mandic Institute and Research Center, Campinas, SP, Brazil

Correspondence should be addressed to Marcelo Henrique Napimoga

Received 15 December 2016; Revised 9 February 2017; Accepted 13 February 2017; Published 28 February 2017

Academic Editor: Timo Sorsa

Copyright © 2017 Gardel Nepomuceno Costa et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Considering the variety of implant connection systems available in the market and the contrasting literature regarding tapered connection systems in terms of bacterial leakage, the aim of this in vitro study was to compare the effectiveness of the bacterial seal at the implant/abutment interface between an external hexagon and a tapered connection system. Twelve sets of indexed tapered connection components and twelve sets of external hexagon connection components were used for microbiological analysis. In addition, for each model, an implant with its respective prosthetic abutment was used as a negative control and another as a positive control of microbial contamination. Failure of the abutment/implant interface seal was observed via turbidity or presence of deposits in the culture. Descriptive analysis of the data and relative frequency (percentage) as well as Fisher’s exact test were used at a significance level of 5%. Two of ten (20%) external hexagon specimens showed contamination against 0/10 (0%) tapered connection implants. In conclusion, both implant/abutment connections were able to prevent bacterial leakage in vitro.