ADA NBDHE Dental Hygienist

Answer: D - An interdental brush is best suited for removing biofilm from a Type III gingival embrasure in a periodontal patient with arthritis.
Tape floss would not easily access the exposed concavities of the teeth around a Type III embrasure space. Gauze cannot be worked through a closed contact. Using knitting yarn with a piece of floss may be effective, but is too difficult for a patient with mobility limited by arthritis. An interdental brush is the easiest and most effective option.