The occurrence of Class III malocclusion is believed to be hereditary although environmental factors such as habits and mouth breathing may play a role.
The prevalence of Class III malocclusion varies among different ethnic groups.
The incidence in Caucasians ranges between 1% and 4% depending on the method of classifying the malocclusion and the age group evaluated.
BOOK: Atlas of Complex Orthodontics - Ravindra Nanda BDS MDS PhD and Flavio Andres Uribe DDS MDentSc - 2016
All cases were treated by Dr. Chris Chang, president of Beethoven Orthodontic and Implant Group in Hsinchu, Taiwan.