Lingual Bar Anatomical Avoidance — NDEB AFK MCQ
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Correct answer: C — The lingual frenum and the mylohyoid ridge
When designing a lingual bar major connector, the clinician must avoid: (1) the lingual frenum (anteriorly — the bar must not impinge on or cross the frenum attachment); (2) the mylohyoid ridge (the bar should be positioned above the active floor of mouth but below the gingival margin — if the mylohyoid ridge is prominent and close to the gingival margin, a lingual plate is indicated instead of a bar); (3) the gingival margin (minimum 4 mm clearance to prevent gingival impingement and plaque accumulation). Survey of the diagnostic cast helps determine the appropriate connector design.
Reference: Carr – McCracken's Removable Partial Prosthodontics, 13th ed., 2015