前方牵引矫治恒牙早期伴拥挤的骨性Ⅲ类错

Anterior Tracting Correction in Treatment of Permanent Teeth Crowded Bone Malocclusion in Ⅲ Dimension

目的探讨前方牵引对恒牙早期且伴有牙列拥挤的骨性Ⅲ类错畸形的矫治效果。方法选择11例恒牙早期且伴有牙列拥挤的骨性Ⅲ类错畸形的的患者,其中男性4例,女性7例,平均年龄10.8岁。先快速扩弓1个月,行前方牵引12个月,应用X线头影测量技术进行硬组织分析,并进行治疗前后测量结果的配对t检验。结果快速扩弓后再行前方牵引治疗前后结果差异有显著性,上颌骨及上牙弓均前移,患者的反解除,SNA、ANB、SN/MP、U1-FHP、U6-FHP、拥挤度均增加,L1/NB、L1/MP、U1/L1均减小。有统计学意义。结论上颌发育不足且牙列拥挤的安氏Ⅲ类错患者在恒牙早期采用快速扩弓加前方牵引,能使骨性畸形得以纠正或程度减轻。

Objective To investigate the effectiveness of maxillary protraction treatment in skeletal Class Ⅲ malocclusion with crowding. Methods 11 patients,4 males, 7 females with skeletal Class Ⅲ malocclusion with crowding in early permanent deatitlon were included.the mean age was 10.8.These patients were eonseeutively treated with rapid maxillary expasion about one months and maxillary protraction facemask about 12 months, lateral eephalometric radiographs were used to quantify the skeletal and dental changes before treatment and after treatrment. T- test was assessed to compare significant difference between the two groups.Results With 12 month treatment, overjet was overcorrected.SNA.SNB.SN/MP.U1 - FHP.U6 - FHP and crowding degree were significantly larger in after treatment group. SNB.L1/NB1 .L1/MP. U1/L1 were significantly smaller in after treatment group. Conclusion Maxillary protraction is very effective method to correct skeletal Class Ⅲ malocclusion with crowding in early permanent dentition.