Restoration margins are plaque-retentive and produce the most inflammation when they are located: (A) Supragingival, (B) Subgingival, (C) At the level of the gingival margin, (D) On buccal surfaces of teeth
Answer is B. Supragingival margins are least detrimental to the gingival tissues; subgingival margins are the most detrimental due to the accumulation of dental plaque.