Angle Orthod. 2021 Mar 1;91(2):178-186. doi: 10.2319/060820-527.1.
To compare the effects of a hybrid miniscrew-supported expander versus a conventional Hyrax (CH) expander in growing patients.
Forty patients were randomized into two groups: a hybrid Hyrax (HH) expander group using a Hyrax expander with two miniscrews and a CH expander group. The final sample had 18 subjects (8 female, 10 male; initial age of 10.8 years) in the HH group and 14 subjects (6 female, 8 male; initial age of 11.4 years) in the CH group. Cone-beam computed tomography examinations and digital dental models were obtained before expansion and 11 months postexpansion. The primary outcomes included the orthopedic transverse effects of expansion. Intergroup comparison was performed using analysis of covariance (P < .05).
Significantly greater increases in the nasal cavity width, maxillary width, and buccal alveolar crest width were found for the HH group. No intergroup differences were observed for dental arch width or shape changes.
The HH group showed greater increases in the nasal cavity width, maxillary width, and buccal alveolar crest width. No differences were observed for intermolar, interpremolar, or intercanine widths; arch length; or arch perimeter. Arch size and shape showed similar changes in both groups.
比较混合微螺钉支抗扩弓器与传统 Hyrax（CH）扩弓器在生长患者中的作用。
40 名患者随机分为两组：使用带有两个微螺钉的 Hyrax 扩弓器的混合 Hyrax（HH）扩弓器组和 CH 扩弓器组。最终样本中，HH 组有 18 名受试者（8 名女性，10 名男性；初始年龄为 10.8 岁），CH 组有 14 名受试者（6 名女性，8 名男性；初始年龄为 11.4 岁）。在扩弓前和扩弓后 11 个月进行了锥形束 CT 检查和数字牙科模型检查。主要结果包括扩张的矫形横向效果。使用协方差分析（P <.05）进行组间比较。
HH 组的鼻腔宽度、上颌宽度和颊牙槽嵴宽度的增加明显更大。牙弓宽度或形状变化在两组间无差异。
HH 组的鼻腔宽度、上颌宽度和颊牙槽嵴宽度增加更大。尖牙间、双尖牙间或尖牙间宽度、弓长或弓周无差异。两组的弓大小和形状均显示出相似的变化。
