Maxillary anterior intrusive forces generated by Begg stage I appliances.
D006801:Humans; D007180:Incisor / Q000502:physiology*; D008437:Maxilla; D008962:Models, Theoretical; D009967:Orthodontic Appliances; D013314:Stress, Mechanical; D014087:Tooth Movement Techniques / Q000295:instrumentation / Q000379:methods*