CAJ | 학술논문

目的：探讨儿童乳前牙反牙合矫治的最佳时机及改良式导弓活动矫治器的治疗效果。方法选择3～5岁乳前牙反牙合患儿50例，采用改良式导弓活动矫治器进行正畸治疗，治疗前后拍头颅侧位片，通过头影测量分析，观察并比较患儿矫治前及矫治后上、下颌骨的位置变化（SNA、SNB、ANB、SN-Pg）、恒牙牙胚位置变化（U1/SN、U1/NA、I1-NB、I1/NB、U1-NA）及软硬组织变化。结果在经过14～75 d的矫治后，50例患儿均取得了良好的疗效。SNA增加（2．51±0．18）°，SNB减少（2．1±0．4）°，SNG增加（1．78±0．9）°，NLA减少（2．04±3．87）°，治疗后上下颌骨、恒切牙牙胚位置、软组织均得到不同程度改善。结论采用改良式导弓活动矫治器对乳前牙反牙合进行矫治，能够有效改善上下颌骨、恒切牙牙胚及软组织位置，并且疗程短，见效快，疗效满意。
목적：탐토인동유전아반아합교치적최가시궤급개량식도궁활동교치기적치료효과。방법선택3～5세유전아반아합환인50례，채용개량식도궁활동교치기진행정기치료，치료전후박두로측위편，통과두영측량분석，관찰병비교환인교치전급교치후상、하합골적위치변화（SNA、SNB、ANB、SN-Pg）、항아아배위치변화（U1/SN、U1/NA、I1-NB、I1/NB、U1-NA）급연경조직변화。결과재경과14～75 d적교치후，50례환인균취득료량호적료효。SNA증가（2．51±0．18）°，SNB감소（2．1±0．4）°，SNG증가（1．78±0．9）°，NLA감소（2．04±3．87）°，치료후상하합골、항절아아배위치、연조직균득도불동정도개선。결론채용개량식도궁활동교치기대유전아반아합진행교치，능구유효개선상하합골、항절아아배급연조직위치，병차료정단，견효쾌，료효만의。
Objective To investigate the best timing of correcting primary dentition anterior crossbite and e-valuate the effects of modified interocclusal lip arch appliance in correcting primary dentition anterior crossbite.Methods Fifty cases (3-5 years old)with primary dentition anterior crossbite were selected. They were treated with the modified interocclusal lip arch appliance.Cephalometric radiographs were taken and analyzed at the pre-treatment time and the post-treatment time.We observed and compared the chan-ges of hard and soft tissue.Results After 14-75 days′correction,50 cases achieved good therapic results. SNA increased (2.51±0.18)°,SNB decreased by (2.1±0.4)°,SNG increased by (1.78±0.9)°,and NLA dreased by (2.04±3.87)°.All of the anterior crossbite were corrected and the profiles were improved satis-factorily after treatment.Conclusion The primary dentition anterior crossbite should be corrected in the milk teeth period.The best timing of correcting primary dentition anterior crossbite is 3-5 years old. Modified interocclusal lip arch appliance is a clinical effective method for correcting primary dentition ante-rior crossbite,improving anterposterior j aw relationship and the face profile.