Class I malocclusion
The term malocclusion refers to a bad relationship or a bad position of the teeth compared with a normal dentition. Several forms of malocclusion exist just like we could say that many different faces exist. It is then important to group these deviations from a normal dentition by their characteristics.
The terms “class I”, “class II” and “class III” define the skeletal anteroposterior (front-back) relationship of the lower jaw with regard to the upper jaw.
The class I relationship represents a normal relationship between both jaws. There is no anteroposterior discrepancy.
The class II relationship means that the lower jaw is shifted backward with regard to the upper jaw
The class III relationship means that the lower jaw is shifted forward with regard to the upper jaw.
Therefore, these terms are not related to severity (class III would be more severe than class II which would be more severe than class I). They are rather related to direction: the absence of discrepancy in class I, backward discrepancy in class II and forward discrepancy in class III.
Deviation from a normal dentition
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