ADA NBDHE Dental Hygienist

Answer: C - When preparing to take an impression the fit of the trays in the patient's mouth should be checked.
All of the above should be done prior to inserting an impression tray loaded with impression material. However, the fit of the trays must first be determined before doing anything else. After the fit is checked, wax may be applied, the water and alginate may be mixed, and the clinician may position himself or herself for taking the impression.