Pediatric Dentistry · single question
A distal step in the primary occlusion will most likely lead to which permanent occlusion?
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Correct answer: C. Class II
The terminal plane relationship in primary dentition predicts the permanent molar relationship. A distal step (upper primary molar is distal to lower, so lower is more mesial) leads to a Class II molar relationship in the permanent dentition. A flush terminal plane leads to end-to-end (Class I or II depending on mesial shift). A mesial step leads to Class I or Class III.
- A. INCORRECT. Class I permanent occlusion typically develops from a flush terminal plane (with mesial shift) or a mild mesial step.
- B. INCORRECT. Class III permanent occlusion develops from a pronounced mesial step in primary occlusion.
- C. CORRECT. A distal step in primary occlusion means the lower primary second molar is distal to (behind) the upper — this predicts a Class II molar relationship when the permanent molars erupt.
- D. INCORRECT. There is no 'Class IV' in the Angle classification system.
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