Angle's Classification of Malocclusion Flashcards

Edward Angle

• Recognized as the father of modern orthodontics.
• First to classify malocclusion.

Class I or Neutrocclusion

• Maxillary first molar’s mesiobuccal (MB) cusp occludes with the MB groove of the mandibular first molar.

Class I Canine Relationship

• Maxillary canine occludes with the distal half of the mandibular canine and the mesial half of the mandibular first premolar.

Class II or Distocclusion

• Maxillary first molar is positioned even with or posterior to the mandibular first molar.
• Buccal surface of the mandibular first molar is distal to the mesiobuccal cusp of the maxillary first molar.

Class II Division 1

• Follows Class II molar relationships.
• Permanent maxillary central incisors are slightly protruded.
• Characterized by a large overjet.

Retrognathic

• Indicates a convex facial profile.
• Results from a smaller mandible or a larger maxilla.

Class II Division 2

• Molar relationships are classified as Class II.
• Maxillary central incisors are retroclined.
• May show proclined maxillary lateral incisors and deep bite.

Class II Molar Relationship

• Mesiobuccal (MB) cusp of the maxillary first molar occludes with the mandibular first molar.

Class III Mesioocclusion

• Mesiobuccal cusp of the maxillary first permanent molar occludes distally to the mesiobuccal groove of the mandibular first molar.

Class III Canine Relationship

• Distal surfaces of the mandibular canines are mesial to the mesial surface of the maxillary canines by at least the width of a premolar.
• Mandibular incisors exhibit complete crossbite.

Prognathic

• Describes a concave facial profile with a prominent mandible.
• Typically associated with Class III malocclusion.

Class I

• Represents the ideal occlusion relationship.

Class II

• A general classification indicating a discrepancy where the maxilla is positioned more anteriorly than the mandible.

Class II Division 1

• Permanent maxillary central incisors are protruded, often featuring a significant overjet.

Class II Division 2

• Maxillary incisors are retroclined with potential for deep bite.

Class III Figure

• Diagrammatic representation related to Class III relationships.

True Class III Malocclusion

• A skeletal type of malocclusion.
• Results from genetic factors, often involving an excessively large mandible or a smaller maxilla.

Pseudo Class III

• A false or postural classification.
• Occurs due to an anterior shift of the mandible during closure, often from premature contact of incisors or canines.