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Following prosthetic rehabilitation of dental implants, emergence of abutment screw remains unsealed or plugged up with several types of material (e.g. cotton pellets, gutta percha, Teflon or wax).
These techniques do not permit the antibacterial sealing, resulting into a bacterial growth and foul odour in the internal parts of the implants (Rimondini et al. 2001, Park et al. 2012) (Gross et al. 1999, Al-Omari et al. 2010).

Quirynen and van Steenberghe (1993) observed the presence of a significant quantity of microorganism in the apical part of the abutment screw and claimed the microbial leakage at the abutment fixture interface as the most probable origin of a bacterial contamination.

In a further study Quirynen et al. (1994) proved the existence of bacterial leakage along the components of the Brånemark implant system, both at A-I interface and from the access hole of the abutment. Hermannet al. (2001) and Broggini et al. (2003) suggested that bacterial leakage at the level of alveolar bone was one of the most important causes of chronic inflammation and marginal bone resorption around two-piece implants.



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