Classification of Malocclusions Flashcards
What is a classification?
A classification system is a grouping of clinical cases of similar appearance for ease in handling and discussion; it is not a system of diagnosis, method for determining prognosis, or a way of defining treatment
Is a classification a diagnosis?
NO
Why do we classify jaw/occlusion relationships in ortho?
- Traditional reasons
- Ease of reference
- Communication
How old is the angle classification?
*100 years old
*Most universally popular
*Used worldwide
What is angle classification based on?
the relationship of the first permanent molars and the alignment (or lack of it) of the teeth relative to the line of occlusion
What plane is Angle’s classification?
sagittal plane
malocclusion is all 3 planes
What is a class I occlusion?
The mesiobuccal cusp of the upper first molar articulates or occludes on the buccal groove of the lower first molar
What is normal occlusion?
Normal or Class I molar relationship, teeth are well aligned with proper overbite and overjet
What class is this?
class I occlusion
What class is this?
class I malocclusion
What is a class I malocclusion?
Normal or class I molar relationship but teeth are crowded or rotated, spaced
What class is this?
class I malocclusion
What does the cephalometric radiograph show?
class I skeletal
What is another name for class II malocclusion?
distocclusion
What is a class II malocclusion?
Lower molar distal to upper molar, relation of other teeth to line of occlusion not specified
What class?
Class II Division 1
What does class II division 1 mean?
*Maxillary incisors in proclination
*Increased overjet
*Prognathic maxilla and/or
retrognathic mandible
What does the cephalometric radiograph show?
class II division 1
What does this profile view show?
class II division 1
- incisors in labioversion
- retrusive mandible
What is a class II division 2?
*The maxillary central incisors are retroclined
*The maxillary lateral incisors have tipped labially and mesially, sometimes overlapping the central incisors
What does the cephalometric radiograph show?
class II division 2
What does this show?
class II division 2
What is the main difference between class II division 2 and class II divison 1
the inclination of the maxillary central incisors
- proclined = division 1
- retroclined = division 2
What is a class III malocclusion?
“mesiocclusion.” Lower molar mesial to upper molar, relation of other teeth to line of occlusion not specified
