INBDE (Integrated National Board Dental Examination) Practice Exam

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Does arch circumference decrease significantly from mixed to permanent dentition in the mandible?

  1. True

  2. False

The correct answer is: True

During mixed dentition, a family of genes instruct morphogenesis of molars while regulating the size of the dental arches. In permanent dentition, this regulation is altered and the facial growth continues without dental arches supervision. This results in a decrease in arch circumference, making option A, true. Option B, false, is incorrect because the arch circumference does decrease significantly during the transition from mixed to permanent dentition.

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