Effects of fixed orthodontic extraction on upper airway in adult of class Ⅱ division 2 malocclusion
Objective To explore the effects of fixed tooth extraction on upper airway in adults of class Ⅱ division 2 malocclu-sion.Methods 32 patients with class Ⅱ division 2 malocclusion were selected and divided into the non-extraction group(18 cases)and the extraction group(14 cases).The arch width,mandibular position and sagittal diameter of upper airway were measured.Results The width of the upper and lower arch of the two groups increased after treatment.There were significant differences in UCC、UPP、LCC、LPP、Pog-N'and Li-PP between the two groups(P＜0.05).There was a significant difference in OB and OJ between the two groups(P＜0.05).SPP-SPPW was negatively correlated with OJ,and U-MPW and B-S'were positively correlated in non-ex-traction group(P＜0.05).Conclusion The sagittal diameter of the upper airway increased in Class Ⅱ division 2 malocclusion patients after fixed extraction correction.The correlation between the upper airway and the width of the dental arch is not significant,but it is closely related to the position of the lower jaw.
Class Ⅱ division 2 malocclusionFixed orthodontic extractionUpper airway
万方数据
维普
