Keles A, Sayinsu K
Faculty of Dentistry, Department of Orthodontics, University of Marmara, Istanbul, Turkey.
Am J Orthod Dentofacial Orthop. 2000 Jan;117(1):39-48. doi: 10.1016/s0889-5406(00)70246-0.
The objectives of our study were to achieve bodily molar distalization, avoid distal tipping of molars, eliminate the need for patient cooperation (no headgear, no elastics, and no esthetic and social concern), and finally to minimize the treatment period and maximize the treatment efficiency. The study was carried out on 5 males and 10 females, a total of 15 patients. Mean age for the study group was 13.53 years. Dentally, all the patients had Class II molar relationship on both sides. The patients were in permanent dentition, second molars were erupted, and the lower dental arch was well aligned. Patients showed normal or sagittally directed growth pattern. Lateral cephalograms and study models were taken and analyzed before and after molar distalization. In the present study, in order to achieve maxillary molar distalization, a new intraoral appliance was developed. The intraoral bodily molar distalizer (IBMB) was composed of 2 parts: the anchorage unit and the distalizing unit. The anchorage unit was a wide Nance button, and the active unit consisted of distalizing springs. The springs had 2 components: the distalizer section of the spring applied a crown tipping force, while the uprighting section of the spring applied a root uprighting force on the first molars. A total of 230 g of distalizing force was used on both sides. After the distal movement of the first molars, the cephalometric results of 15 patients showed the following. Maxillary first molars were moved distally by an average of 5.23 mm (P <.001) without tipping or extrusion. Maxillary first premolars were moved 4.33 mm mesially (P <.001), tipped 2.73 degrees distally (P <.05), and extruded by 3.33 mm (P <.001). Maxillary central incisors were proclined by an average of 4.7 mm (P <.001) and tipped 6.73 degrees labially (P <.01). Model analysis showed that maxillary first molars were not rotated, and intermolar distance did not change after distal movement of molars. In conclusion, unlike most of the other molar distalization mechanics, this newly developed device achieved (1) bodily distal movement of maxillary molars and (2) eliminated dependence on patient cooperation and did not require headgear wear for molar root uprighting.
我们研究的目的是实现磨牙整体远中移动，避免磨牙远中倾斜，消除患者配合的必要性（无需戴头帽、使用弹力牵引，且不存在美观和社交方面的顾虑），最后尽量缩短治疗周期并提高治疗效率。该研究对5名男性和10名女性，共15名患者进行。研究组的平均年龄为13.53岁。在牙齿方面，所有患者双侧磨牙均为安氏II类关系。患者均处于恒牙列期，第二磨牙已萌出，下颌牙弓排列整齐。患者呈现正常或矢状向生长模式。在磨牙远中移动前后拍摄并分析了头颅侧位片和研究模型。在本研究中，为实现上颌磨牙远中移动，研发了一种新型口腔矫治器。口腔内磨牙整体远中移动矫治器（IBMB）由两部分组成：支抗单元和远中移动单元。支抗单元是一个宽大的Nance托，活动单元由远中移动弹簧组成。弹簧有两个部分：弹簧的远中移动部分施加冠向倾斜力，而弹簧的直立部分对第一磨牙施加牙根直立力。两侧总共使用230克的远中移动力。第一磨牙远中移动后，15名患者的头影测量结果如下。上颌第一磨牙平均远中移动5.23毫米（P <.001），无倾斜或伸长。上颌第一前磨牙近中移动4.33毫米（P <.001），远中倾斜2.73度（P <.05），伸长3.33毫米（P <.001）。上颌中切牙平均前倾4.7毫米（P <.001），唇倾6.73度（P <.01）。模型分析表明，上颌第一磨牙未发生旋转，磨牙远中移动后磨牙间距离未改变。总之，与大多数其他磨牙远中移动力学方法不同，这种新研发的装置实现了（1）上颌磨牙的整体远中移动，以及（2）消除了对患者配合的依赖，且无需戴头帽来直立磨牙牙根。
