Darsey Drew M, English Jeryl D, Kau Chung H, Ellis Randy K, Akyalcin Sercan
Department of Orthodontics, School of Dentistry, University of Texas Health Science Center at Houston, Houston, USA.
Imaging Sci Dent. 2012 Jun;42(2):83-8. doi: 10.5624/isd.2012.42.2.83. Epub 2012 Jun 25.
The aim of this study was to investigate the initial effects of maxillary expansion therapy with Hyrax appliance and to evaluate the related changes in maxillary sinus volume.
Thirty patients (20 females, 10 males; 13.8 years) requiring maxillary expansion therapy, as part of their comprehensive orthodontic treatment, were examined. Each patient had cone-beam computed tomography (CBCT) images taken before (T1) and after (T2) maxillary expansion therapy with a banded Hyrax appliance. Multiplanar slices were used to measure linear dimensions and palatal vault angle. Volumetric analysis was used to measure maxillary sinus volumes. Student t tests were used to compare the pre- and post-treatment measurements. Additionally, differences between two age groups were compared with Mann-Whitney U test. The level of significance was set at p=0.05.
Comparison of pre-treatment to post-treatment variables revealed significant changes in the transverse dimension related to both maxillary skeletal and dental structures and palatal vault angle, resulting in a widened palatal vault (p<0.05). Hard palate showed no significant movement in the vertical and anteroposterior planes. Nasal cavity width increased on a mean value of 0.93mm(SD=0.23, p<0.05). Maxillary sinus volume remained virtually stable. No significant age differences were observed in the sample.
Hyrax expansion therapy did not have a significant impact on maxillary sinus volume.
本研究旨在调查使用Hyrax矫治器进行上颌扩弓治疗的初始效果，并评估上颌窦容积的相关变化。
对30例（20名女性，10名男性；平均年龄13.8岁）需要进行上颌扩弓治疗的患者进行检查，该治疗作为其综合正畸治疗的一部分。每位患者在使用带环Hyrax矫治器进行上颌扩弓治疗前（T1）和治疗后（T2）均拍摄了锥形束计算机断层扫描（CBCT）图像。使用多平面切片测量线性尺寸和腭穹窿角。采用容积分析测量上颌窦容积。使用学生t检验比较治疗前后的测量值。此外，使用曼-惠特尼U检验比较两个年龄组之间存在的差异。显著性水平设定为p = 0.05。
治疗前与治疗后变量的比较显示，与上颌骨骼和牙齿结构以及腭穹窿角相关的横向尺寸有显著变化，导致腭穹窿变宽（p < 0.05）。硬腭在垂直和前后平面上未显示出明显移动。鼻腔宽度平均增加0.93mm（标准差 = 0.23，p < 0.05）。上颌窦容积基本保持稳定。样本中未观察到显著的年龄差异。
Hyrax扩弓治疗对上颌窦容积没有显著影响。
