Canullo L, Tallarico M, Peñarrocha-Oltra D, Monje A, Wang HL, Peñarrocha-Diago M. Implant Abutments Cleaning by Plasma of Argon: Five Years Follow-Up of a RCT. J Periodontol. 2015 Nov 12:1-13.
Contamination of implant abutments could potentially influence the peri-implant tissue inflammatory response. The aim of the present study was to assess the radiographic bone changes around customized, platform switched, abutments placed according to the «one-abutment-one-time» protocol, with and without plasma of argon cleaning treatment.
Thirty healthy patients with thin gingival biotype (<1mm) and history of periodontal disease received one maxillary implant. Immediately before abutment connection, patients were randomly assigned to control (cleaning protocol by steaming) and test group (plasma of argon treatment). Outcome measures were: success rate of the implants and prostheses, biologic and prosthetic complications, peri-implant marginal bone loss (MBL) , esthetic and periodontal parameters and patient satisfaction.
Neither implants nor prostheses were lost in both groups at the 5-year follow-up examination. Overall, both groups showed a slight amount of peri-implant bone loss from baseline to the 5-year follow-up examination. A statistically higher mean MBL was found in the control group compared to the test group at 6, 24, and 60 months after crown connection. Nevertheless, during the entire follow-up period, intragroup comparison demonstrated statistically significant mean MBL in the control group, but not in the test group. Test group showed a higher mean gain at the soft tissue margin, but not for the papilla. All implants showed good periodontal parameters, with no significant differences between groups.
Plasma of argon could be used to disinfect implant abutments prior to its insertion to minimize future peri-implant bone resorption.