The interincisal angle between deciduous incisors is:
Correct Answer: 150 degrees
Description: Primary teeth are upright, but permanent teeth incline to the labial surface, thus decreasing the inter-incisal angle from about 150 degrees in the deciduous dentition to 123 degrees in the permanent dentition. This increases the arch perimeter.
Ref: Textbook of orthodontics Gurkeerat Singh 2nd ed pg no 46
Category:
Dental
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