I have a very brief understanding of terms used for putting a patient to sleep. From what I know about IV sedation, the patient is given sedation drugs thru an IV so the dentist can do whatever dental procedure is scheduled. They still may be able to hear and feel some of whats happening. Theres many different levels of sedation. Im not sure if the IV sedation knocks the patient out completely or addresses a patients pain. Some forms of putting a patient to sleep for procedures allow the patient to still hear and feel some of whats happening. Personally, Im NOT a fan of being sedated. I greatly dislike feeling disoriented and groggy after being sedated. I dont care for the local anesthesia or the feeling of half of my face being numb for hours. When Im given a choice (for a biopsy) I have the doc just do the biopsy without sedation, anesthesia or even a local shot to numb the area.