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Questions and Answers
What are the 3 facial profiles?
What are the 3 facial profiles?
- Mesognathic (correct)
- Orthognathic
- Retrognathic (correct)
- Prognathic (correct)
How are the 3 facial profiles measured?
How are the 3 facial profiles measured?
by the gnathic index (or alveolar index), that is, the ratio of the distance from the middle of the nose to the chin.
What does mesognathic describe?
What does mesognathic describe?
Having slightly protruded jaws giving the facial outline a relatively flat appearance.
What does retrognathic describe?
What does retrognathic describe?
What does prognathic describe?
What does prognathic describe?
Angle's classification of malocclusion describes normal or ideal occlusion.
Angle's classification of malocclusion describes normal or ideal occlusion.
Describe Class I Malocclusion.
Describe Class I Malocclusion.
Describe the position of the molars in Class I Malocclusion.
Describe the position of the molars in Class I Malocclusion.
Describe the position of the canine in Class I Malocclusion.
Describe the position of the canine in Class I Malocclusion.
What facial profile do patients with Class I Malocclusion have?
What facial profile do patients with Class I Malocclusion have?
What is Distoclusion?
What is Distoclusion?
Describe Class II Malocclusion.
Describe Class II Malocclusion.
Describe the molars in Class II Malocclusion.
Describe the molars in Class II Malocclusion.
Describe the canines in Class II Malocclusion.
Describe the canines in Class II Malocclusion.
What factors determine Class II Malocclusion subgroups?
What factors determine Class II Malocclusion subgroups?
Describe Class II Malocclusion: Division 1.
Describe Class II Malocclusion: Division 1.
Describe the facial profile of Class II Malocclusion: Division 1.
Describe the facial profile of Class II Malocclusion: Division 1.
What is the facial profile in Class II: Division 1?
What is the facial profile in Class II: Division 1?
Describe the palate in Class II: Division 1.
Describe the palate in Class II: Division 1.
Describe Class II Malocclusion: Division 2.
Describe Class II Malocclusion: Division 2.
What is the facial profile of Class II: Division 2?
What is the facial profile of Class II: Division 2?
What is Class III Malocclusion?
What is Class III Malocclusion?
Describe Class III Malocclusion.
Describe Class III Malocclusion.
Describe the facial profile of Class III Malocclusion.
Describe the facial profile of Class III Malocclusion.
What is the facial profile of Class III Malocclusion?
What is the facial profile of Class III Malocclusion?
Describe the molars in Class III Malocclusion.
Describe the molars in Class III Malocclusion.
Describe the canines in Class III Malocclusion.
Describe the canines in Class III Malocclusion.
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Study Notes
Facial Profiles
- Three facial profiles: mesognathic, retrognathic, and prognathic.
- Measurement through the gnathic index, defined as the ratio from the middle of the nose to the chin.
Mesognathic Profile
- Characterized by slightly protruded jaws giving a straight facial profile.
Retrognathic Profile
- Defined by a prominent maxilla and a mandible that is positioned posteriorly, resulting in a convex profile.
Prognathic Profile
- Features a protruded mandible with a typically normal maxilla, producing a concave profile.
Angle's Classification of Malocclusion
- Focuses exclusively on malocclusion of the molars and canines, excluding normal or ideal occlusion.
Class I Malocclusion
- The mesiobuccal cusp of the maxillary first molar occludes with the MB groove of the mandibular first molar.
- Maxillary canine occludes with the distal half of the mandibular canine and the mesial half of the mandibular first premolar.
- Facial profile is generally normal or mesognathic.
Class II Malocclusion
- Known as distoclusion; the mesiobuccal cusp of the maxillary first molar occludes mesial to the MB groove of the mandibular first molar.
- The distal surface of the mandibular canine is positioned distal to the mesial surface of the maxillary canine by at least the width of a premolar.
Class II Malocclusion Characteristics
- Two subgroups: Division 1 and Division 2, based on anterior position, palate shape, and facial profile.
- Division 1: Features maxillary anteriors protruding with a deep overbite, resulting in a retrognathic profile and a often narrow, v-shaped palate.
- Division 2: Characterized by maxillary laterals overlapping centrals and centrals may be retruded or upright, leading to a mesognathic facial profile.
Class III Malocclusion
- Referred to as mesiocclusion; the mesiobuccal cusp of the maxillary first molar occludes distal to the MB groove of the mandibular first molar.
- The distal surface of the mandibular canine is mesial to the mesial surface of the maxillary canine.
- Typically presents with a prominent mandible and potentially a retrusive maxilla, resulting in a prognathic facial profile.
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