Kiliç Nihat, Kiki Ali, Oktay Hüsamettin
Department of Orthodontics, Faculty of Dentistry, Atatürk University, Erzurum, Turkey.
Eur J Orthod. 2008 Feb;30(1):67-72. doi: 10.1093/ejo/cjm099.
The objective of the present study was to evaluate buccal dentoalveolar inclinations in subjects treated with a Hyrax (tooth-borne) or acrylic-bonded (tooth-tissue borne) palatal expander. The sample comprised 39 patients (10 males and 29 females) aged between 11 and 16 years randomly assigned to two groups. Rapid maxillary expansion (RME) was carried out with a Hyrax appliance in one group (n = 21) and with an acrylic-bonded appliance in the other (n = 18). Their mean ages were 13 years 9 months and 13 years 6 months, respectively. Orthodontic study models were obtained before RME (T1) and approximately 1 week after completion of maxillary expansion (T2). A line of barium sulphate solution was drawn between the upper first molars on the models, and radiographs were taken. The radiographic images of the models were transferred to digital medium, and buccal tipping of the molar crowns and alveolar processes were evaluated by means of a software program. The data were analysed by paired and Student's t-tests. Both RME appliances produced significant (P < 0.001) dentoalveolar tipping during RME, but this was greater in the Hyrax group (P < 0.05).
本研究的目的是评估使用Hyrax（牙支持式）或丙烯酸粘结式（牙-组织支持式）腭扩弓器治疗的受试者的颊侧牙牙槽倾斜度。样本包括39名年龄在11至16岁之间的患者（10名男性和29名女性），随机分为两组。一组（n = 21）使用Hyrax矫治器进行快速上颌扩弓（RME），另一组（n = 18）使用丙烯酸粘结式矫治器。他们的平均年龄分别为13岁9个月和13岁6个月。在RME之前（T1）和上颌扩弓完成后约1周（T2）获取正畸研究模型。在模型上的上颌第一磨牙之间绘制硫酸钡溶液线，并进行X线摄影。将模型的X线图像转换为数字介质，并通过软件程序评估磨牙牙冠和牙槽突的颊向倾斜度。数据采用配对t检验和学生t检验进行分析。两种RME矫治器在RME过程中均产生了显著的（P < 0.001）牙牙槽倾斜，但Hyrax组的倾斜度更大（P < 0.05）。
