Management of patient fear and anxiety during surgical procedures is a primary concern of dental practitioners. Sedation is increasingly being used to improve patient comfort by relieving anxiety, elevating the pain threshold, rendering the patient compliant, and inducing amnesia. 1 However, many drugs used for sedation are central nervous system and respiratory depressants that can result in decreased ventilatory response to CO 2 , attenuated tidal volume, and decreased respiratory rate. 2 – 5 Accordingly, respiratory monitoring during