摘要： Conventional mechanical debridement is the main procedure for treating plaque-induced peri-implantitis, such as using plastic/metallic curettes, sand blasting machines, polishing by rubber cup/pumice powder, ultrasonic scalers, and titanium brushes. However, it is difficult to completely remove bacterial plaque with these instruments, especially in the micro-threads area. Recently, use of Er:YAG laser in dental field has increased for periodontal and peri-implantitis therapy, because Er:YAG laser is able to effectively ablate soft and hard tissues as well as calculus, and it can effectively debride the titanium surface with minimal thermal damage under suitable energy output. Meanwhile, the blood clot forming in the superficial areas of grafted bone by Er:YAG laser irradiation without water spray is useful for bone regenerative procedure, which is so called the Er:YAG laser-assisted bone regenerative therapy (Er-LBRT) developed by Taniguchi et al. This case report demonstrated a perspective option for implant surface debridement and simultaneously bone regeneration by Er-LBRT technique without usage of membrane coverage.