Slaviero Thiago, Fernandes Thais Maria Freire, Oltramari-Navarro Paula Vanessa Pedron, de Castro Ana Claudia, Conti Ferreira, Poleti Marcelo Lupion, de Almeida Marcio Rodrigues
Angle Orthod. 2017 Mar;87(2):215-222. doi: 10.2319/060116-438.1. Epub 2016 Sep 6.
To evaluate the dimensional changes of dental arches on digital models of open bite treatment with fixed and removable palatal cribs.
The sample comprised 41 patients of both sexes who were white, aged 7-10 years, and who had mixed dentition, Angle Class I molar relationship, and a negative overbite of at least 1 mm. The sample was randomly divided into two groups: G1, fixed palatal crib; and G2, removable palatal crib. Cast models, obtained initially (T1) and after 1 year of treatment (T2), were scanned by a three-dimensional (3D) scanner, 3Shape R700, producing a 3D image. Measurements were performed by a calibrated examiner using OrthoAnalyzer™ 3D software.
At T2-T1, differences were observed between the groups regarding vertical dentoalveolar development and overjet. There was more mandibular incisor extrusion for G1 (-1.66 mm) than for G2 (-0.54 mm). An overjet increase was observed in G1 (0.56 mm), in contrast to a reduction in G2 (-0.40 mm). There was a similar overbite increase for both groups (3.51 mm for fixed palatal crib and 3.88 mm for removable palatal crib).
Both the treatment protocols are similarly effective for anterior open bite correction, providing an overbite increase with dentoalveolar arch changes, especially in the anterior region.
评估使用固定式和可摘式腭托矫治器治疗开（牙合）时牙弓在数字模型上的尺寸变化。
样本包括41名白种人患者，年龄7至10岁，性别不限，处于混合牙列期，安氏I类磨牙关系，覆（牙合）至少为负1毫米。样本随机分为两组：G1组为固定式腭托矫治器；G2组为可摘式腭托矫治器。在治疗开始时（T1）和治疗1年后（T2）获取的石膏模型，用三维（3D）扫描仪3Shape R700进行扫描，生成3D图像。由一名经过校准的检查者使用OrthoAnalyzer™ 3D软件进行测量。
在T2 - T1时，两组在垂直牙槽骨发育和覆盖方面存在差异。G1组下颌切牙的伸长量（-1.66毫米）大于G2组（-0.54毫米）。G1组覆盖增加（0.56毫米），而G2组覆盖减少（-0.40毫米）。两组的覆（牙合）增加量相似（固定式腭托矫治器为3.51毫米，可摘式腭托矫治器为3.88毫米）。
两种治疗方案在纠正前牙开（牙合）方面同样有效，随着牙槽弓变化覆（牙合）增加，尤其是在前牙区。
