CAJ | 학술논문

　　背景：快速扩大牙弓是快速扩大颌骨的有效方法，而与快速扩展相比，缓慢扩展稳定性更高，复发更少，但四圈簧扩弓的长期稳定性少见报道。目的：回顾性分析正畸临床中四圈簧扩大牙弓的临床效果。方法：混合牙列期及恒牙列早期牙弓狭窄患者22例使用四圈簧扩大牙弓至少3 mm，在扩大牙弓之前(T1期)、Ⅰ期四圈簧扩弓治疗完成或整个治疗结束(T2期)及治疗完成后2年(T3期)分别制取牙齿石膏研究模型并摄取头颅后前位片，在模型上测量两侧第一恒磨牙之间距离，在后前位片上描点(J 点)测量两侧基骨间距离及磨牙倾斜度，评价牙弓扩大的矫正及矫形效果。结果与结论：与扩弓前相比，四圈簧扩弓治疗后患者第一恒磨牙倾斜度和两侧基骨间距离逐渐减小；而四圈簧扩弓治疗后相比，随访2年时，患者两侧第一恒磨牙间距离、第一恒磨牙倾斜度和两侧基骨间距离的差异无显著性意义(P >0.05)，提示四圈簧扩大牙弓的长期效果是稳定的，并有矫形效果。
　　배경：쾌속확대아궁시쾌속확대합골적유효방법，이여쾌속확전상비，완만확전은정성경고，복발경소，단사권황확궁적장기은정성소견보도。목적：회고성분석정기림상중사권황확대아궁적림상효과。방법：혼합아렬기급항아렬조기아궁협착환자22례사용사권황확대아궁지소3 mm，재확대아궁지전(T1기)、Ⅰ기사권황확궁치료완성혹정개치료결속(T2기)급치료완성후2년(T3기)분별제취아치석고연구모형병섭취두로후전위편，재모형상측량량측제일항마아지간거리，재후전위편상묘점(J 점)측량량측기골간거리급마아경사도，평개아궁확대적교정급교형효과。결과여결론：여확궁전상비，사권황확궁치료후환자제일항마아경사도화량측기골간거리축점감소；이사권황확궁치료후상비，수방2년시，환자량측제일항마아간거리、제일항마아경사도화량측기골간거리적차이무현저성의의(P >0.05)，제시사권황확대아궁적장기효과시은정적，병유교형효과。
BACKGROUND: Rapid expansion of the dental arch is an effective way to rapidly expanse the jaw. Compared with rapid expansion, the slow expansion has higher stability and less recurrence, but the reports on the long-term stability of quad helix expansion are rare. OBJECTIVE: To retrospectively analyze the clinical effect of quad helix expansion in orthodontics. METHODS: Twenty-two subjects with dental arch stenosis in mixed dentition and early permanent dentition who experienced an expansion of at least 3 mm with quad helix appliance were selected for this study. Plaster dental casts and posteroanterior radiographs were evaluated at the beginning of the treatment (T1), at the completion of phase I quad helix expansion or ful treatment (T2), and approximately 2 years fol owing the completion of treatment (T3). The distance between two first molars was measured on the model. J point was drawn on the posteroanterior radiograph in order to measure the distance between the bilateral base bones and the molar inclination, as wel as to evaluate the corrective and orthopedic effects of dental arch expansion. RESULTS AND CONCLUSION: Compared with that before expansion, the first permanent molar inclination and the distance between base bones on two sides were significant increased after quad helix expansion; there were no significant differences in the distance between two first permanent molars, first permanent molar inclination and the distance between bilateral base bones on two sides when compared after quad helix expansion and after 2-year fol ow-up (P > 0.05). The results indicate that the long-term effect of quad helix expansion is stable with orthopedic effect.