Upper Incisor Inclination — NDEB AFK MCQ
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Correct answer: B — U1 to palatal plane (maxillary plane) angle
The U1 to palatal plane (maxillary plane) angle measures the inclination of the upper incisors relative to the maxillary base. The normal value is approximately 110° (±5°). An increased angle indicates proclination (forward tipping) of the upper incisors; a decreased angle indicates retroclination. This measurement is critical for treatment planning in Class II Division 1 (proclined incisors) and Class II Division 2 (retroclined incisors) malocclusions.
Reference: Proffit – Contemporary Orthodontics, 6th ed., 2019