Orthodontics · single question
What factor in Class II dental malocclusion most affects protrusion?
Show answer and explanation
Correct answer: C. Lingual incline of the upper incisors
- A. Intercondylar distance affects the range of mandibular movement but is not the primary occlusal factor for protrusion in Class II dental malocclusion.
- B. Curve of Spee relates to the anteroposterior curvature of the mandibular arch — not specifically the primary driver of protrusion in Class II dental malocclusion.
- C. Correct. In Class II dental malocclusion (where the skeletal relationship may be normal but dental positions are off), the lingual inclination of the maxillary incisors is a key factor that determines the degree of excessive overjet/protrusion. Retroclined upper incisors can contribute to a deep bite, while proclined incisors increase the protrusion.
- D. Bennett angle affects lateral mandibular movement — not primarily protrusion in Class II.