A. Sutural Theory B. Functional Matrix Theory C. Nasal Septum Theory (Scott’s Theory) D. Servo-System Theory Answer: C Explanation: Scott’s Hypothesis states that the cartilage of the nasal septum acts as a pacemaker for maxillary growth.
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A. Teeth B. Bone (cortical plate) C. Muscles D. Soft tissue Answer: B Explanation: Cortical bone provides higher resistance to tooth movement than cancellous bone or teeth. This is the principle behind "cortical anchorage" used in temporary anchorage devices (TADs). Nasal Septum Theory (Scott’s Theory) D
A. Molar relationship: The mesiobuccal cusp of the upper first molar occludes with the buccal groove of the lower first molar. B. Correct crown angulation and inclination. C. Absence of rotations and spaces. D. The dental midline can be slightly off-center. Answer: D Explanation: One of the six keys to normal occlusion (Andrews) is that the dental midlines should be aligned. A deviation indicates a malocclusion. Teeth B
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✅ This stage occurs around ages 7–11 when the eruption of permanent canines creates temporary spacing and midline diastemas that often resolve naturally.