Conroy-Piskai Cara, Galang-Boquiren Maria Therese S, Obrez Ales, Viana Maria Grace Costa, Oppermann Nelson, Sanchez Flavio, Edgren Bradford, Kusnoto Budi
Angle Orthod. 2016 Nov;86(6):925-933. doi: 10.2319/112315-799. Epub 2016 May 16.
To determine if there is a significantly different effect on vertical changes during phase I palatal expansion treatment using a quad helix and a bonded rapid maxillary expander in growing skeletal Class I and Class II patients.
This retrospective study looked at 2 treatment groups, a quad helix group and a bonded rapid maxillary expander group, before treatment (T1) and at the completion of phase I treatment (T2). Each treatment group was compared to an untreated predicted growth model. Lateral cephalograms at T1 and T2 were traced and analyzed for changes in vertical dimension.
No differences were found between the treatment groups at T1, but significant differences at T2 were found for convexity, lower facial height, total facial height, facial axis, and Frankfort Mandibular Plane Angle (FMA) variables. A comparison of treatment groups at T2 to their respective untreated predicted growth models found a significant difference for the lower facial height variable in the quad helix group and for the upper first molar to palatal plane (U6-PP) variable in the bonded expander group.
Overall, both the quad helix expander and the bonded rapid maxillary expander showed minimal vertical changes during palatal expansion treatment. The differences at T2 suggested that the quad helix expander had more control over skeletal vertical measurements. When comparing treatment results to untreated predicted growth values, the quad helix expander appeared to better maintain lower facial height and the bonded rapid maxillary expander appeared to better maintain the maxillary first molar vertical height.
确定在生长发育期的骨骼I类和II类患者中,使用四螺旋扩弓器和固定快速上颌扩弓器进行I期腭扩展治疗时,对垂直变化的影响是否存在显著差异。
这项回顾性研究观察了2个治疗组,即四螺旋扩弓器组和固定快速上颌扩弓器组,在治疗前(T1)和I期治疗结束时(T2)的情况。将每个治疗组与未经治疗的预测生长模型进行比较。对T1和T2时的头颅侧位片进行描记并分析垂直维度的变化。
在T1时,治疗组之间未发现差异,但在T2时,发现凸度、面下高度、全面高、面轴和法兰克福下颌平面角(FMA)变量存在显著差异。将T2时的治疗组与其各自未经治疗的预测生长模型进行比较,发现四螺旋扩弓器组的面下高度变量和固定扩弓器组的上颌第一磨牙至腭平面(U6-PP)变量存在显著差异。
总体而言,四螺旋扩弓器和固定快速上颌扩弓器在腭扩展治疗期间均显示出最小的垂直变化。T2时的差异表明,四螺旋扩弓器对骨骼垂直测量的控制更强。当将治疗结果与未经治疗的预测生长值进行比较时,四螺旋扩弓器似乎能更好地维持面下高度,而固定快速上颌扩弓器似乎能更好地维持上颌第一磨牙的垂直高度。