Internal decontamination of dental implants: an in vivo randomized microbiologic 6-month trial on the effects of a chlorhexidine gel.

Background: Microbial penetration inside an implant's internal cavity results in a bacterial reservoir that has been associated with an area of inflamed connective tissue facing the fixture–abutment junction. The aim of the present clinical trial was to evaluate the effectiveness of a 1% chlorhexidine gel on the internal bacterial contamination of implants with screw-retained abutments.Methods: Thirty subjects (age range: 27.3 to 54.2 years) underwent single implant restoration. Three months after prosthodontic restoration, the modified sulcus bleeding index, modified plaque index, full-mouth plaque score, and full-mouth bleeding score were recorded. Microbiologic samples were also collected from the internal part of each fixture. Subjects were then divided into two equal groups: control and test groups (CG and TG, respectively). The CG had the abutment screwed and the crown cemented without any further intervention. Conversely, the TG had the internal part of the fixture filled with a 1% chlorhexidine ge...

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