Orthodontics Lec 3: Diagnostic Aids for Impacted Teeth
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Questions and Answers

What is the main purpose of using a dental panoramic radiograph (OPG) in assessing impacted maxillary canines?

  • To determine the size of the maxillary canines
  • To measure the distance between the maxillary canines and adjacent teeth
  • To evaluate the condition of the surrounding gum tissue
  • To assess the presence, position, and morphology of unerupted teeth (correct)

    • Why is it difficult to apply the magnification method for localizing impacted maxillary canines in certain cases?

  • If the canine is positioned horizontally instead of vertically
  • If the canine is too small to be accurately magnified
  • If the canine is located close to the gum line
  • If the canine is rotated or in contact with an incisor root (correct)

    • What is the basis of the horizontal parallax method for determining the position of an unerupted upper canine?

  • Relies on measuring the distance between the canine and adjacent teeth
  • Relies on comparing images taken from different angles to determine position (correct)
  • Relies on evaluating the buccolingual position of the canine
  • Relies on assessing the size of the canine relative to adjacent teeth

    • What factor determines how objects appear in a dental panoramic radiograph (OPG) according to the text?

    <p>The distance from the x-ray source and film</p> Signup and view all the answers

    In which situation would a palatally displaced canine appear magnified compared with a contralateral tooth?

    <p>When it is further from the film and closer to the x-ray source</p> Signup and view all the answers

    Study Notes

    Dental Panoramic Radiograph (OPG) in Impacted Maxillary Canines

    • The main purpose of using a dental panoramic radiograph (OPG) in assessing impacted maxillary canines is to determine the position and localization of the impacted tooth.

    Challenges in Applying the Magnification Method

    • Difficulty in applying the magnification method for localizing impacted maxillary canines arises in cases where the impacted tooth is located in the surrounding bone, making it hard to determine its exact position.

    Basis of the Horizontal Parallax Method

    • The horizontal parallax method for determining the position of an unerupted upper canine is based on the principle that different radiographs taken from varying angles will show a change in the position of the unerupted tooth relative to adjacent anatomic landmarks.

    Factors Affecting Appearance in Dental Panoramic Radiograph (OPG)

    • The distance of an object from the focal spot determines how it appears in a dental panoramic radiograph (OPG); objects closer to the focal spot appear larger, while those farther away appear smaller.

    Palatally Displaced Canine and Magnification

    • A palatally displaced canine appears magnified compared to a contralateral tooth when viewed on a dental panoramic radiograph (OPG) due to its closer proximity to the focal spot.

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    Description

    Learn about the diagnostic aids for localizing impacted teeth, with a focus on the use of radiographs and the magnification method. Understand how dental panoramic radiographs are used to assess the presence, position, and morphology of unerupted teeth, particularly maxillary canines.

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