Orthodontics: Malocclusion Classifications
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Questions and Answers

Who is considered the father of modern orthodontics and was the first to classify malocclusion?

Edward Angle

What is Class I or neutrocclusion?

The MB of the maxillary first molar occludes with the MB groove of the mandibular first molar.

What describes Class I canine relationship?

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

What is Class II or distocclusion?

<p>The maxillary first molar is even with or posterior to the mandibular first molar; the buccal of the mandibular first molar is distal to the mesiobuccal cusp of the maxillary first molar.</p> Signup and view all the answers

What characterizes Class II division 1?

<p>The molar relationships are like those of Class II; permanent maxillary central incisors are in a normally slightly protruded position or a large overjet is present.</p> Signup and view all the answers

What does retrognatic refer to?

<p>A convex face profile resulting from a mandible that is too small or a maxilla that is too large.</p> Signup and view all the answers

What is Class II division 2?

<p>The molar relationships are Class II where the maxillary central incisors are retroclined, with potentially retroclined maxillary lateral incisors and a deep bite.</p> Signup and view all the answers

What defines Class II molar relationship?

<p>The MB cusp of the maxillary first molar occludes.</p> Signup and view all the answers

What describes Class III mesioocclusion?

<p>The mesiobuccal cusp of the maxillary first permanent molar occludes distally to the mesiobuccal groove of the mandibular first molar.</p> Signup and view all the answers

What is Class III canine relationship?

<p>The distal surface of the mandibular canines are mesial to the mesial surface of the maxillary canines by at least the width of a premolar. Mandibular incisors are in complete crossbite.</p> Signup and view all the answers

What does prognathic refer to?

<p>A concave face profile with a prominent mandible associated with class 3 malocclusion.</p> Signup and view all the answers

Class I classification is defined as _____.

<p>N/A</p> Signup and view all the answers

Class II classification is defined as _____.

<p>N/A</p> Signup and view all the answers

Class II division 1 classification is defined as _____.

<p>N/A</p> Signup and view all the answers

Class II division 2 classification is defined as _____.

<p>N/A</p> Signup and view all the answers

Class III figure classification is defined as _____.

<p>N/A</p> Signup and view all the answers

What is true Class III malocclusion?

<p>Skeletal, which is genetic in origin due to excessively large mandibular or smaller than normal maxilla.</p> Signup and view all the answers

What is pseudo Class III?

<p>False or postural, which occurs when the mandible shifts anteriorly during final stages of closure due to premature contact of incisors or the canines.</p> Signup and view all the answers

Study Notes

Edward Angle

  • Known as the father of modern orthodontics.
  • First individual 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.
  • The buccal aspect of the mandibular first molar is distal to the mesiobuccal cusp of the maxillary first molar.

Class II Division 1

  • Molar relationship resembles Class II.
  • Permanent maxillary central incisors are slightly protruded or exhibit a large overjet.

Retrognathic

  • Characterized by a convex face profile.
  • Results from a small mandible or an oversized maxilla.

Class II Division 2

  • Molar relationships are Class II.
  • Maxillary central incisors are retroclined.
  • Maxillary lateral incisors may be proclined or normally inclined, with a deep bite present.

Class II Molar Relationship

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

Class III or Mesioocclusion

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

Class III Canine Relationship

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

Prognathic

  • Concave face profile associated with Class III malocclusion.
  • Characterized by a prominent mandible.

True Class III Malocclusion

  • Skeletal in nature and often genetically predisposed.
  • Results from an excessively large mandible or a smaller-than-normal maxilla.

Pseudo Class III

  • False or postural malocclusion.
  • Occurs when the mandible shifts anteriorly during the final stages of closure, often due to premature contact of incisors or canines.

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Description

Explore the fundamental concepts of orthodontics with a focus on malocclusion classifications established by Edward Angle. This quiz covers Class I, Class II, and their subdivisions, helping you understand the intricacies of dental alignment. Perfect for students and professionals in the field of dentistry.

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