Angle's Classification of Malocclusion

Overview

• Edward H. Angle classified malocclusion using the relationship between the first molars of both arches.
• Key factor: positioning and occlusion of molars.

Classes of Malocclusion

Normal Occlusion

• Mesobuccal cusp of the upper first molar occludes with the buccal groove of the lower first molar.

Class I Malocclusion

• Similar to normal occlusion.
• Characterized by:
  • Crowding
  • Rotations
  • Positional irregularities

Class II Malocclusion

• Mesobuccal cusp of the upper first molar occludes anterior to the buccal groove of the lower first molar.

• Two subtypes:

  Class II Division 1

  • Upper incisors are tilted outwards (protruded).
  • Causes a significant overjet.
  • Overjet: Horizontal distance between upper and lower central incisors.

  Class II Division 2

  • Upper incisors are retroclined.
  • Causes an increased overbite.
  • Overbite: Vertical relationship between upper and lower central incisors.

Class III Malocclusion

• Mesobuccal cusp of the upper first molar occludes posterior to the buccal groove of the lower first molar.

Conclusion

• Understanding these classifications helps in diagnosing and planning treatments for dental malocclusions.

Thank you for learning with us. Please like and subscribe for more educational content.