骨性Ⅱ类青少年Twin-Block 矫治后气道和下颌骨变化的相关性研究

Abstract

Abstract: Abstract: Objective to explore the correlations between the changes of upper-airway and mandible in adolescents patients with Class II division 1 malocclusion and mandibular retrusion treated with Twin-block functional appliance. Methods.40 cases of adolescent with Class II division 1 malocclusion and mandibular retrusion received Twin-block treatment were selected as the study group whereas 20 adolescents with skeletal Class II did not receive treatment or wearing vestibular shield were serve as the control group.The CBCT was taken before and after treatment in the study group while the two CBCT test of the control group were finished within 1 year approximately.The changes of upper-airway and mandibular were measured by using Dolphin software. SPSS 18.0 software package was used for Pearson correlation analysis. Results There was no significant correlation between the changes of mandible position and the upper airway (P > 0.05).The changes of mandibular length (r = 0.351), mandibular body length (r = 0.382), anterior facial height (r = 0.355) and posterior facial height (r = 0.321) were significantly correlated with the change of the lateral diameter of velopharynx(P < 0.05). Conclusion Twin-block appliance treatment can promote the growth and development of mandible and increase the lateral diameter of velopharyngeal to enlarge the volume of the upper airway in adolescent.

Key words: upper airway, mandible, correlation, Twin-block

CLC Number:

R783.5

References 24

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Correlations between the changes of upper airway and mandible after Twin-Block treatment in adolescents with ClassⅡ malocclusion

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