Bjork Classification of Mandibular Rotation
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Questions and Answers

What is the reason for the forward rotation of the mandible in relation to the maxilla?

  • Gonial angle resorption
  • Ligamentous attachments at the incisal edges of lower incisors (correct)
  • Muscular attachments at the center of the upper incisors
  • Resorption below the chin

    • In cases of large maxillary overjet or mandibular overjet, where is the center of rotation displaced to in the dental arch?

  • Molars
  • Premolars (correct)
  • Canines
  • Lower incisors

    • What happens to the position of the lower posterior teeth in relation to the upper teeth during forward growth rotation of the mandible?

  • They undergo resorption
  • They become more upright than usual (correct)
  • They become more tilted backwards
  • They lean towards the palate

    • Which type of rotation causes the anterior face height to become underdeveloped while the posterior face height increases?

    <p>Forward growth rotation</p> Signup and view all the answers

    What type of rotation of mandible results in a deep-bite due to lower dental arch pressing into the upper arch?

    <p>Type I forward rotation</p> Signup and view all the answers

    What influences the inclination of the teeth significantly?

    <p>Position of the upper incisors</p> Signup and view all the answers

    What can be referred to as 'packing' in relation to the rotation of the jaw?

    <p>Creating crowding in the anterior segment</p> Signup and view all the answers

    Which component of mandibular growth contributes to the increase in the posterior face height according to the text?

    <p>Increase in the height of the ramus</p> Signup and view all the answers

    What is the likely cause of a deep-bite resulting from forward rotation of the mandible?

    <p>Powerful muscular pressure</p> Signup and view all the answers

    Which type of forward rotation involves the rotation of the posterior part of the mandible away from the maxilla?

    <p>Type II</p> Signup and view all the answers

    What is the effect of Type II forward rotation on the condylar fossa?

    <p>It becomes shallower</p> Signup and view all the answers

    What role does vertical condylar growth play in the lowering of the mandible as described in the text?

    <p>It lowers the mandible</p> Signup and view all the answers

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