Meral Orhan, Yüksel Sema
Department of Orthodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey.
Angle Orthod. 2003 Dec;73(6):716-22. doi: 10.1043/0003-3219(2003)073<0716:SADEDO>2.0.CO;2.
The aim of this study was to evaluate the effects of a magnetic appliance, MAD IV, on the treatment of anterior open bites in growing patients. The study material included the lateral cephalograms and hand-wrist radiographs of 16 patients who had an anterior open bite malocclusion. The radiographs were taken at the beginning (T1) and at the end of observation period (T2) and at the end of MAD IV application (T3). At the beginning of the study, the mean age of the subjects was 11 years two months. To define the direction of facial growth, the patients were first observed for nine months without any orthodontic or orthopedic approach. At the end of the observation period, patients who had shown a vertical growth direction, resulting in an increase in open bite, were given an MAD IV appliance and were instructed to wear the appliance 18 hours a day for 7.5 months. Thirty-two different parameters were evaluated from the lateral cephalograms. Paired t-tests were used for statistical evaluation of differences that occurred during the periods and between the periods. During the observation period, the patients continued their mandibular posterior rotation resulting in an increase in lower facial height (P < .001) and an open bite (P < .01). During the treatment period, the patients showed an anterior mandibular rotation with statistically important decreases in lower facial height and open bite (P < .001). In the treatment of anterior open bite with the MAD IV appliance, skeletal changes played a role along with dental and dentoalveolar effects.
本研究的目的是评估一种磁力矫治器（MAD IV）对生长发育期患者前牙开颌治疗的效果。研究材料包括16例前牙开颌错颌畸形患者的头颅侧位片和手腕部X线片。这些X线片在研究开始时（T1）、观察期末（T2）以及MAD IV矫治器应用结束时（T3）拍摄。研究开始时，受试者的平均年龄为11岁零2个月。为确定面部生长方向，首先对患者进行9个月的观察，期间不采取任何正畸或矫形治疗方法。在观察期末，对于那些表现出垂直生长方向且导致开颌增加的患者，给予MAD IV矫治器，并指导他们每天佩戴18小时，持续7.5个月。从头颅侧位片中评估了32个不同参数。采用配对t检验对各阶段以及不同阶段之间出现的差异进行统计学评估。在观察期内，患者继续下颌向后旋转，导致面下高度增加（P < .001）和开颌增加（P < .01）。在治疗期内，患者表现出下颌向前旋转，面下高度和开颌有统计学意义的降低（P < .001）。在使用MAD IV矫治器治疗前牙开颌时，骨骼变化与牙齿及牙槽骨效应共同发挥作用。
