At Sedation Clinic of Department of Dentistry in Hanyang University Medical Center, total 92 dental treatments under intravenous conscious sedation using midazolam alone for 80 patients were carried out from March 2006 to February 2007. Following the previous article concerning our sedation protocol, the retrospective analyses of our cases were presented in detail. By the evidence-based approach, we hope that our study will help the general dental practitioners perform the intravenous conscious sedation using midazolam alone safely and effectively.