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目的探讨面具式前方牵引器对替牙期上颌骨发育不足所致前牙反颌的应用及临床疗效。方法选用14例替牙期上颌骨发育不足的反颌儿童,年龄范围8～12岁,应用前方牵引器进行矫治,每侧500～800克力,每天连续佩戴前牵器12～16h。结果 14例患者均经6～9个月(平均7.8个月)的前方牵引矫治治疗。Ⅲ类错(牙合)畸形纠正,A点前移,SNA角度增加2.40°(P<0.01),ANB变正值,上前牙唇倾度U1-SN向增加2.25°(P<0.05),差异有统计学意义,上、下颌骨间不调改正,侧貌改善明显。结论前方牵引矫治器对大多数生长发育期儿童,由于上颌发育不足形成的牙性Ⅲ类错合畸形有明显的治疗作用,有利于Ⅲ类骨骼畸形的调整。
Objective To investigate the application and frontal response of mask-type frontal traction device to the anterior teeth of the maxillary anterior teeth caused by underdevelopment of maxillary dentition. Methods Fourteen patients with maxillary underdevelopment were retrospectively studied. The age range was from 8 to 12 years old. The frontal traction device was used for orthodontic treatment. Each side was treated with 500 ~ 800 gram force. The anterior traction device was worn continuously for 12 ~ 16 hours per day. Results All the 14 patients were treated by traction treatment in front of 6 ~ 9 months (average 7.8 months). (P <0.01). The positive ANB value and the U1-SN of the anterior lip increased by 2.25 ° (P <0.05), while the angle of SNA increased by 2.40 ° The difference was statistically significant, on the mandible between the non-adjusted correction, lateral appearance improved significantly. Conclusion For the majority of children with growth and development, the front traction appliance has a significant therapeutic effect on the malformations of dental malformations caused by maxillary hypoplasia, which is good for the adjustment of type Ⅲ skeletal malformations.