CAJ | 학술논문

目的：探讨上颌骨性前突病例应用双钥匙曲内收上前牙的临床疗效。方法对采用双钥匙曲关闭上颌拔牙间隙的18例上颌骨性前突完成病例，分别进行治疗前后的软组织侧貌分析和侧位片X线头影测量分析，其结果进行配对t检验。结果所有病例拔牙间隙关闭效果均良好，关闭速度平均为每个月1.2 mm，治疗后SNA角、A点凸度及上唇突度较治疗前明显减小（t＝2.547， P＜0.05），治疗后上切牙角均达到或保持正常。结论使用双钥匙曲内收上前牙时，在使上前牙远中移动的同时，能很好的控制上前牙的转矩及垂直向位置，可以获得上前牙整体内收的效果，对于前牙唇倾不明显、直立或舌倾的上颌骨性前突拔牙病例具有临床推广价值。
목적：탐토상합골성전돌병례응용쌍약시곡내수상전아적림상료효。방법대채용쌍약시곡관폐상합발아간극적18례상합골성전돌완성병례，분별진행치료전후적연조직측모분석화측위편X선두영측량분석，기결과진행배대t검험。결과소유병례발아간극관폐효과균량호，관폐속도평균위매개월1.2 mm，치료후SNA각、A점철도급상진돌도교치료전명현감소（t＝2.547， P＜0.05），치료후상절아각균체도혹보지정상。결론사용쌍약시곡내수상전아시，재사상전아원중이동적동시，능흔호적공제상전아적전구급수직향위치，가이획득상전아정체내수적효과，대우전아진경불명현、직립혹설경적상합골성전돌발아병례구유림상추엄개치。
Objectives To evaluate the treatment outcome of double keyhole loops in skeletal maxillary protrusion cases. Methods Eighteen finished cases with skeletal maxillary protrusion were chosen. Lateral cephalometric radiographs were taken and cephalometric analysis were done for them all before and after treatment. Data were analyzed by using paired t-test. Results The extraction space was closed effectively in all cases. The space was closed by 1.2 mm/month in average. After treatment, the SNA angle, A point protrusion and upper lip protrusion were significantly reduced than before (t=2.547, P < 0.05). The normal inclination of upper incisors was achieved. Conclusions By using double keyhole loops, the close extraction space could be closed effectively with the good control of the troque and the vertical position of anterior teeth. In another word, bodily movement of the upper incisors can be achieved with double keyhole loops.