Table 1 Inclusion and exclusion criteria of subjects
Inclusion criteria | Exclusion criteria |
|---|---|
Mongolian | Skeletal Class III malocclusion |
Skeletal Class I or Class II | Severe crowding |
18.0–25.9 years old | Asymmetry in facial appearance |
Permanent dentition | History of dental injuries |
No head injury or other oral-maxillofacial diseases | |
No congenitally missing, extracted or supernumerary teeth | |
No orthodontic or orthognathic treatment | |
No endodontic or periodontal diseases | |
No systematic diseases |