A day surgery unit (DSU) was established at Kyoto University Hospital in January 2000. Dental implants and related surgery are performed in the DSU by our department. The purpose of this research was to investigate problems with implants and related surgery at the DSU.<br/> In this study, the subjects were 61 patients (male 32,female 29) under general anesthesia with standardized protocols from May 2000 to May 2004. For outpatient surgery, major problems were bleeding from the nose and throat with intra-nasal intubations, postoperative nausea and vomiting (PONV), and pain after operation. We coped with nasal bleeding using a relatively small intubation tube. For PONV, opioid and nitric oxide gas were avoided during anesthesia. Nonsteroidal anti-inflammatory drugs (NSAID) were used before operation as a pre-emptive analgesia. During operation, local anesthesia was used positively. After operation, NSAID and local anesthesias were administered. After operation, patients were moved to the recovery room for observation of general and local physical conditions. Their physical status was evaluated by the Aldrete Score, and when they fulfilled specific standards, they were moved to the step down recovery room. In this room, they were evaluated for general status and permission for going home by the Postoperative Discharge Scoring System. The next day, a medical examination by interview was performed. The operations included implant placement in 32 cases, abutment connection in 5 cases, bone graft for alveolar bone augmentation in 14 cases, sinus lift in 9 cases, and alveolar distraction in 1 case. Average surgery time was 114 ± 39 min (40-213min), average anesthesia time was 169 ± 41 min (91-265 min), and average staying time was 216 ± 46 min (135-335 min). The interview revealed pain of the wound(high 2, moderate 12, small 14, none 33), sore throat (high 4, moderate 4, small 18 and none 35), and nausea and vomiting (high 0, moderate 2, light 1, none 58).<br/> In conclusion, it was possible to conduct safely the implant surgery accompanied by advanced surgical invasion with standardized ambulatory general anesthesia. For outpatient surgery, it is important to recover the general status smoothly; therefore it is essential to draw up a standardized patient care guideline at the time of surgery.