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目的探讨应用快速扩弓+前方牵引矫治骨性Ⅲ类错的临床效果。方法选择26例生长发育期的骨性Ⅲ类错应用快速扩弓+前方牵引的方法进行矫治,对矫治前后的X线头颅侧位片和石膏模型进行测量,比较治疗前后软硬组织的变化及PAR指数评价。结果 A点前移2.26mm,SNA角、ANB角、ANS-Ptm、Wits值均增大,SNB角减小,且差异有统计学意义(P<0.05)。PAR指数评分:治疗前后总分减少19.59分,减少百分率为83.12%,治疗后覆盖、覆、后牙咬合改善程度较大,所有患者前牙反解除,但牙齿排列及中线改善程度不明显。结论前方牵引治疗生长发育期骨性Ⅲ类错是十分有效的,有利于Ⅲ类骨骼的调整,但还需固定矫治器进一步调整后牙咬合、牙齿排列及中线。
Objective To investigate the clinical effect of rapid protraction and anterior traction in the treatment of skeletal class Ⅲ malocclusion. Methods Twenty-six patients with skeletal class Ⅲ malocclusion during growth and development were treated with rapid protraction and anterior traction. X-ray cephalostral and gypsum models were measured before and after treatment. The changes of the soft and hard tissues before and after treatment were compared And PAR index evaluation. Results A point forward 2.26mm, SNA angle, ANB angle, ANS-Ptm, Wits increased, SNB angle decreased, and the difference was statistically significant (P <0.05). PAR index score: Before and after treatment, the total score decreased by 19.59 points, a decrease of 83.12%. After treatment, coverage, overlays and posterior teeth bite improved a lot, anti anterior teeth were removed in all patients, but dental alignment and midline improvement were not obvious. Conclusion The treatment of skeletal class Ⅲ malocclusion in the early stage of traction and development is very effective, which is good for the adjustment of type Ⅲ bones. However, the orthodontic appliance is needed to further adjust the occlusion of teeth, the arrangement of teeth and the midline.