Article:

Edward H. Angle described class III malocclusion as one in which the mandibular first molar is positioned mesially relative to the maxillary first molar. A class III skeletal relationship can occur as a result of a normal maxilla with mandibular protrusion, maxillary retrusion with a normal mandible, or a combination of maxillary retrusion and mandibular protrusion. A class III dental relationship can exist when the maxillary/mandibular relationship is normal.