Conscious sedation in dental treatment of patients with special needs (PNEs) has the purpose of controlling events such as anxiety and fear, as well as promoting muscle relaxation and mastery of uncoordinated movements. Benzodiazepines (BZDs) are among the most used drugs due to their anxiolytic, hypnotic and sedative properties. The objective of this investigation is to demonstrate a study on the contribution of conscious sedation with BZD in PNEs. The study included 40 PNEs, non-collaborators, submitted to conscious oral sedation with Midazolam (0.5 mg/kg) for dental treatment, receiving vital signs monitoring in the pre, trans and postoperative periods. Male patients were more frequent with 70% of the cases, with a mean age of 18 years. As for medical diagnosis, autism and mental deficiency were the most prevalent. The most performed procedures were restoration (32%) and exodontia (30%). There was a statistically significant reduction in systolic and diastolic blood pressure parameters (p<0.05) in the transoperative and postoperative periods when compared to the preoperative period. Conscious sedation with BZDs resulted in 83% positive responses. The results demonstrate that this technique is safe and effective, and can be used in outpatient care for PNEs. However, the risk/benefit ratio should be correctly evaluated.