The change of the cant of the occlusion plane of the patients with classⅠbia-maxillary protrusion before and ;after orthodontic treatment
Abstract：Objective To evaluate the change of the cant of the occlusal plane of the patients with class Ⅰbia-maxillary protrusion before and after orthodontic treatment. Methods Nineteen patients with classⅠbia-maxillary protrusion were extracted by 4 first premolars and treated with straight wire appliance. Pre-treatment and post-treat-ment lateral cephalograms of the patients were obtained and evaluated to determine the difference in the cant of the oc -clusal plane.Results The cant of anterior occlusal plane (AOP-FH)was (10.50 ±2.59)°before treatment,(13.18 ± 4.21 ) °after treatment, and the difference was significant ( P<0.05 ). The change of the cant of posterior occlusal plane(POP-FH)showed no statistical difference (P>0.05).Conclusion After treatment, the cant of posterior oc-clusal plane of the patients with classⅠbia-maxillary protrusion remain stable. But the cant of anterior occlusal plane become larger and this change have something to do with the lingual extrusion and relative elongation of upper teeth.
Keywords：Skeletal class ⅠmalocclusionOcclusal plane
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：3( 998-1000 )