扩弓辅弓与改良横腭杆扩大上颌牙弓的临床效果比较

Comparison of clinical effects of auxiliary expansion arch and modified horizontal palatal bar on maxillary expansion

目的比较扩弓辅弓和改良横腭杆扩大上颌牙弓的效果。方法分别应用扩弓辅弓与改良横腭杆对35例患者上颌牙弓进行扩弓,比较2组矫治前后的牙弓宽度改变。结果使用扩弓辅弓的病例第一前磨牙扩弓宽度变化不明显,增加2 mm左右,第二前磨牙和第一磨牙的磨牙宽度均有明显扩大,增加4 mm左右;使用改良横腭杆的病例第一、二前磨牙及第一磨牙间宽度均增加4 mm左右。结论上颌牙弓轻中度狭窄的病例采用扩弓辅弓和改良横腭杆扩弓均有较好的扩弓效果,可以根据各自的特点选择合适的病例。

Objective To compare the clinical effects of auxiliary expansion arch and modified horizontal palatal bar on maxillary ex- pansion. Methods 35 patients were randomly divided into two groups for expanding the maxillary dentition. One group used auxiliary expansion arches and the other used modified horizontal palatal bars. The changes in dental arch widths were compared after the thera- py. Results In the auxiliary expansion arch group, the dental arch width was significantly increased between second premolars and first molars（ about 4 ram） ,but not between the first premolars（about 2 mm）. While in the modified horizontal palatal bar group, the dental arch width all significantly increased about 4 mm between first and second premolars and between first molars. Conclusions The auxil- iary expansion arch and the modified horizontal palatal bar are both effective for expanding maxillary dentition in mild-moderate dental crowding patients. Clinicians may choose appropriate method according to patients＇ characteristics.