Laser Therapy for Peri-implantitis The World Consensus Conference divided periimplant diseases into the following four categories: 1. Health around the implant. 2. Perimplplanimplant mucositis. 3. Peric implantitis. 4. Soft and hard tissue defects around the implant. The latter three categories belong to the broad category of peri-implantitis. And some studies have reported that the incidence of peri-implantitis is as high as 28.5%. Peri-implantitis is an inflammatory disease occurring in