A dentist may use the services of a dental assistant to perform certain duties if the dental assistant: Has successfully completed a Board-approved course of at least 35 hours related to Maryland general duties dental assisting; and Is certified by the Dental Assisting National Board as qualified in general duties or was recognized by the Board of Dental Examiners, on or before June 19, 1974, as a dental assistant qualified in general duties. If a dental assistant meets the qualifications of §A of this regulation, a dentist may use the services of the dental assistant qualified in general duties to perform the following intraoral tasks, provided that the tasks are performed only in response to a specific instruction from and under the direct supervision of a licensed dentist: Performing vitality tests; Taking impressions for study models or diagnostic casts; Taking alginate impressions for intraoral appliances; Applying topical fluoride; Applying desensitizing agents; Applying topical anesthesia; Placing or removing a rubber dam; Etching; Curing by the use of a halogen light; Fabricating indirect restorations in a dental office; Placing or removing a matrix band; Drying a root canal; Preparing and fitting stainless steel crowns; Placing or removing retraction cord; Preparing temporary crowns; Cementing temporary crowns or restorations; Removing temporary crowns; Removing excess cement; Removing or placing a periodontal dressing (except placing the original periodontal dressing); Removing sutures; Constructing athletic mouth guards on models; and Any other duty approved by the Board. A dentist may not use the services of a dental assistant qualified in general duties to perform any of the following services on the basis that the dental assistant meets the qualifications of §A of this regulation: Examination, diagnosis, and treatment planning; Surgery on hard or soft tissues; Oral prophylactic procedures, including scaling, root planing, and polishing teeth; Condensing, carving, or finishing any restoration; Administering injectable local anesthesia; Applying pit and fissure sealants; Initiation of treatment at any time for the correction of malocclusions and malformations of the teeth or jaws; Cementing of orthodontic bands, placement of bonded attachments or the removal of cemented or bonded orthodontic bands and attachments; Cementing permanent crowns or restorations; Adjusting occlusion of natural teeth, restorations, or appliances; Registration of jaw relations; Placing an initial surgical dressing; Preparing or fitting orthodontic bands; Placing or removing an arch wire; Selecting headgear; Placing elastics or ligatures; and Adjusting prosthetic appliances.