Orthodontic Relapse — NDEB AFK MCQ
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Correct answer: C — Late mandibular growth
Late mandibular growth (continued anterior rotation and forward growth) is the most common cause of post-orthodontic relapse of lower incisor crowding. This growth continues into the late teens and early twenties, producing mesial forces on the mandibular incisors. Long-term retention (fixed lingual retainer or removable retainer) is essential. Other factors include soft tissue pressures and periodontal fibre reorganisation.
Reference: Proffit – Contemporary Orthodontics, 6th ed., 2019