18 patients (mean age 52 years) diagnosed by peri- implantitis were included in this randomized and controlled study. A total of forty dental implants were debrided with either standard plastic curettes, debridement made by combined klorhegsidin rinse(control, n=20) or mechanical debridement made by ultrasonic polyetheretherketone coated tips developed for implant surface and combined air-flow debridement (test, n=20).