INBDE (Integrated National Board Dental Examination) Practice Exam

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Ace your INBDE with our comprehensive practice exam. Featuring detailed explanations, interactive flashcards, and a wide array of multiple-choice questions designed to mirror the real test. Get ready to surpass your expectations!

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Hyalinization of the PDL occurs when during heavy orthodontic force?

Within minutes
Within days
Within hours
Within weeks

The correct answer is: Within hours

When heavy orthodontic force is applied, hyalinization of the periodontal ligament (PDL) occurs within hours. Hyalinization is the process where the PDL becomes acellular and homogenous due to the compression of blood vessels under excessive orthodontic forces. This can lead to temporary ischemia in the PDL, affecting the tooth's ability to move during orthodontic treatment. Therefore, in this scenario, hyalinization would occur relatively quickly within hours of applying heavy orthodontic force, making option C the correct answer. Options A, B, and D are incorrect because they indicate timeframes that are longer than when hyalinization typically occurs during heavy orthodontic force application.