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Related Experiment Videos

Localizing ectopic maxillary canines--horizontal or vertical parallax?

Conor Armstrong1, Chris Johnston, Donald Burden

  • 1Orthodontic Division, Oral Healthcare Research Centre, School of Clinical Dentistry, Queen's University Belfast, UK.

European Journal of Orthodontics
|January 1, 2004
PubMed
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Horizontal parallax (HP) radiography is more accurate than vertical parallax (VP) for locating ectopic maxillary canines (EMCs). HP correctly identified 83% of EMCs, significantly outperforming VP at 68%.

Area of Science:

  • Dentistry
  • Orthodontics
  • Radiology

Background:

  • Ectopic maxillary canines (EMCs) pose diagnostic challenges.
  • Accurate localization is crucial for effective orthodontic treatment planning.

Purpose of the Study:

  • To compare the diagnostic accuracy of horizontal parallax (HP) and vertical parallax (VP) radiography for localizing EMCs.
  • To determine the preferred radiographic technique for EMC localization.

Main Methods:

  • Compared HP and VP radiography in localizing 43 ectopic maxillary canines.
  • Six orthodontists assessed radiographs, recording localization accuracy and 'unsure' diagnoses.
  • True positions were verified using operative notes and study models.

Main Results:

Related Experiment Videos

  • HP radiography demonstrated significantly higher accuracy (83%) than VP (68%) for EMC localization (P < 0.05).
  • HP reduced 'unsure' diagnoses to 5% compared to 12% with VP.
  • Diagnostic sensitivity for palatal EMCs was superior with HP (88%) versus VP (69%).
  • Both techniques showed similar, poor sensitivity (63%) for buccal EMCs.

Conclusions:

  • Horizontal parallax (HP) radiography is diagnostically superior to vertical parallax (VP) for locating ectopic maxillary canines.
  • Recommended radiographic views for EMC localization include two peri-apical or one peri-apical and one anterior occlusal radiograph.