【摘要】 目的探讨年轻成人上颌快速扩弓后患者牙颌结构的变化。方法以16例年轻成人上颌快速扩弓患者为观察组,32例替牙期上颌快速扩弓患者为对照组。比较扩弓前(T1期)扩弓后(T2期)患者牙颌结构的变化,测量项目包括上颌牙弓宽度、上颌第一恒磨牙(牙合)平面交角、临床牙冠高度、腭穹隆角、腭龈缘水平宽度、腭中部宽度、腭顶宽度差以及下颌平面角和下面高。t检验,α为0．05。结果①上颌快速扩弓后观察组6-6牙弓宽度增加4．2+2．7mm,对照组增加5．4+2．3mm,二者没有显著性差异。②上颌快速扩弓后观察组上颌第一恒磨牙(牙合)平面交角减小6．4+11．3°,对照组减小0．6+5．6°,二者具有显著性差异。③上颌快速扩弓后观察组腭穹隆角增加8．1+ 6．9°,对照组增加1．6+7．8°,二者具有显著性差异。④上颌快速扩弓后观察组腭顶宽度差为0．8+1．2mm,对照组为3．0+1．7mm,二者具有显著性差异。⑤上颌快速扩弓后观察组临床牙冠高度增加0．6+0．4mm,对照组增加0．2 +0．4mm,二者没有显著性差异。⑥上颌快速扩弓后观察组下颌平面角增加0．9+1．8°,对照组增加1．4+2．5°,二者没有显著性差异。结论年轻成人上颌快速扩弓可以有效地扩大上颌牙弓宽度,扩弓主要依靠牙齿及牙槽骨的颊向倾斜扩展,但是并不会引起明显的牙龈退缩和下颌顺时针旋转。更多还原

【Abstract】 Objective To evaluate the dental and skeletal changes in young adults with posterior crossbite after rapid maxillary expansion.Methods The observation group included 16 YA-RME subjects,while the control group included 32 RME subjects in mixted dentine.Records were taken at the pre-treatment time (T1) and post-treatment (T2) including 9 measurements of maxillary transverse arch width,molar angle,clinical crown height,palatal vault angle,palatal width at gingival height,palatal width at mid-pahte,palatal width difference,MP-SN angle and ANS -Me distance.Students’t-test were used to determine if there were significant differences between 2 time periods and between 2 groups.Results①There was no significant difference between YA-RME group and control group in the 6- 6 transverse arch width increase;4.2+2.7mm compared to 5.4+2.3mm.②Significant difference was found in molar angle decrease;6.4+11.3°compared to 0.6+5.6°.③Significant difference was found in palatal vault angle increase; 8.1+6.9°compsred to 1.6+7.8°.④Significant difference was found in palatal width difference;0.8+1.2mm compared to 3.0+1.7mm.⑤No significant difference was found in clinical crown height increase;0.6+0.4mm compared to 0.2 +0.4mm.⑥No significant difference was found in MP-SN angle increase;0.9+1.8°compared to 1.4+2.5°. Conclusion The results indicate that young adult rapid maxillary expansion (YA-RME) is a clinically effective and safe method for correcting maxillary arch deficiency without significant gingival recession and mandibular rotation.更多还原