Certified Instrument Specialist (CIS) Practice Exam

The instrument primarily used for extracting tooth roots is an elevator. Elevators are designed to loosen teeth from the periodontal ligaments and surrounding bone, making it easier to extract the tooth or its roots. They come in various shapes and designs, which allows them to access different areas of the mouth effectively. By applying leverage and using the sharp end of the tool to separate the root from the socket, elevators facilitate the extraction process with minimal trauma to the surrounding tissues.

The other options do not serve the same primary purpose as elevators. For instance, a molt mouth gag is used to keep a patient's mouth open during dental procedures, enabling better access for the dentist but not for extraction itself. A carpule is a small cartridge used to hold anesthetic solution for injections, addressing pain control rather than extraction technique. Lastly, rongeurs are surgical instruments used to trim and reshape bone rather than to extract teeth or roots. While they can assist in the extraction process after an elevator has loosened the tooth, they are not primarily designed for the extraction of tooth roots.