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 orthodontic dental assisting; and Is certified by the Dental Assisting National Board in orthodontics or was recognized by the Board of Dental Examiners, on or before June 19, 1974, as a dental assistant qualified in orthodontics. If a dental assistant meets the qualifications of §A of this regulation, a dentist may permit the dental assistant qualified in orthodontics to perform the following intraoral tasks, provided that the tasks are performed only in response to a specific instruction from and under direct supervision of a licensed dentist: Taking impressions for study models or diagnostic casts; Applying topical fluoride; Preparing and fitting orthodontic bands; Etching; Removing excess cement from around orthodontic bands; Placing and removing arch wires; Cementing of orthodontic bands, placement of bonded attachments, or the removal of cemented or bonded orthodontic bands and attachments: Placing elastics and ligatures; Selecting headgear; Applying desensitizing agents; Applying topical anesthesia; Constructing athletic mouth guards on models; Taking alginate impressions for intraoral appliances; Curing by the use of halogen light; and Any other duty approved by the Board. A dentist may not use the services of a dental assistant qualified in orthodontics 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 of teeth with rotary instruments; 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; Adjusting occlusion of natural teeth, restorations, or appliances; Placing an initial surgical dressing; Performing vitality tests; Preparing temporary crowns; Cementing temporary or permanent crowns or restorations; Removing temporary crowns; Placing or removing retraction cord; Placing or removing a rubber dam; Placing or removing a matrix band; Preparing and fitting stainless steel crowns; Drying a root canal; Removing or placing a periodontal dressing; and Adjusting prosthetic appliances.