Kırcalı Mümin, Yüksel Alime Sema
Private Practice, Bursa, Turkey.
Department of Orthodontics, Gazi University School of Dentistry, Ankara, Turkey.
Turk J Orthod. 2018 Dec;31(4):103-109. doi: 10.5152/TurkJOrthod.2018.18004. Epub 2018 Dec 1.
The aim of this study was to evaluate the dentoalveolar and dentofacial effects of a mini-screw-anchored pendulum appliance in maxillary molar distalization.
Twenty patients with the Angle Class II molar relationship (mean age 14.05±2.4 years) were treated with a mini-screw-anchored pendulum appliance for molar distalization. A mini-screw 1.9 mm in diameter and 9 mm in length was used to support the pendulum appliance. The springs of the pendulum appliance were activated at 90° and exerted 250-300 gr force per side. Lateral cephalometric radiographs and dental cast models were obtained from all the patients before and after maxillary molar distalization.
A 0.6° increase in the SNA and SNB angles, and a 0.3° decrease in the SN/GoGn angle were found to be statistically significant. In the maxillary first molars, 4.2-mm significant distalization, 0.6-mm significant intrusion, and 8.9° significant distal tipping were observed. The spontaneous distal drift of the maxillary second premolars was found to be statistically significant. In the maxillary first premolar and incisor positions, significant mesialization was observed; however, the changes in the angles of these teeth were found to be insignificant.
A mini-screw-anchored pendulum appliance is an effective method for maxillary molar distalization that controls the undesired anchorage loss observed in conventional methods.
本研究旨在评估微型螺钉锚定摆式矫治器对上颌磨牙远移的牙槽骨及牙面影响。
选取20例安氏II类磨牙关系患者（平均年龄14.05±2.4岁），采用微型螺钉锚定摆式矫治器进行磨牙远移治疗。使用直径1.9 mm、长度9 mm的微型螺钉来支持摆式矫治器。摆式矫治器的弹簧以90°激活，每侧施加250 - 300克的力。在所有患者上颌磨牙远移前后均拍摄头颅侧位片并制取石膏模型。
发现SNA和SNB角增加0.6°，SN/GoGn角减小0.3°，差异具有统计学意义。在上颌第一磨牙，观察到远移4.2 mm、垂直压低0.6 mm及远中倾斜8.9°，差异具有统计学意义。上颌第二前磨牙的自发远中漂移具有统计学意义。在上颌第一前磨牙和切牙位置，观察到明显的近中移动；然而，这些牙齿角度的变化无统计学意义。
微型螺钉锚定摆式矫治器是上颌磨牙远移的有效方法，可控制传统方法中出现的不期望的支抗丧失。
