Taner Tülin Uğur, Yukay Filiz, Pehlivanoglu Muge, Cakirer Banu
Department of Orthodontics, Hacettepe University Faculty of Dentistry, Ankara, Turkey.
Angle Orthod. 2003 Dec;73(6):686-91. doi: 10.1043/0003-3219(2003)073<0686:ACAOMT>2.0.CO;2.
The purpose of this study was to compare the effects of cervical headgear and pend-x on the maxillary first molar, second molar, first premolar, and upper incisors. Cephalometric radiographs were obtained at the start of treatment (T1) and after molar distalization was completed (T2) for 13 patients in a pend-x group and 13 patients in a cervical headgear group. The changes of the maxillary teeth were measured on maxillary superimpositions. Nonparametric Mann-Whitney U-test was used to compare the mean differences between the two groups. The mean amount of distalization for the headgear group was 3.15 +/- 1.94 mm and that for the pend-x group was 3.81 +/- 2.25 mm. The second molar teeth were also distalized to a mean amount of 2.27 +/- 1.33 mm in the headgear group and 2.04 +/- 2.15 mm in the pend-x group. The mean treatment time for distalization was 11.38 +/- 3.18 months for the headgear group and 7.31 +/- 4.09 months for the pend-x group. During distalization, the maxillary molars tipped distally in both groups, but intergroup differences were not significant. The anterior inclinations of the first premolar and upper incisor increased significantly in the pend-x group (P < .01). Maxillary molars showed no vertical movement in the pend-x group but extruded in the headgear group (P < .01). The anchorage loss of the pend-x appliance as well as the necessary patient compliance and greater treatment time with the cervical headgear should be taken into consideration.
本研究的目的是比较颈带式矫治器和Pend-x矫治器对上颌第一磨牙、第二磨牙、第一前磨牙和上颌切牙的影响。对Pend-x矫治器组的13例患者和颈带式矫治器组的13例患者，在治疗开始时（T1）和磨牙远移完成后（T2）拍摄头影测量X线片。在上颌重叠片上测量上颌牙齿的变化。采用非参数Mann-Whitney U检验比较两组之间的平均差异。矫治器组的平均远移量为3.15±1.94mm，Pend-x矫治器组为3.81±2.25mm。矫治器组第二磨牙的平均远移量为2.27±1.33mm，Pend-x矫治器组为2.04±2.15mm。矫治器组远移的平均治疗时间为11.38±3.18个月，Pend-x矫治器组为7.31±4.09个月。在远移过程中，两组上颌磨牙均向远中倾斜，但组间差异不显著。Pend-x矫治器组第一前磨牙和上颌切牙的前倾显著增加（P<.01）。Pend-x矫治器组上颌磨牙无垂直移动，但矫治器组有伸长（P<.01）。应考虑Pend-x矫治器的支抗丧失以及使用颈带式矫治器时患者所需的配合度和更长的治疗时间。
