Rhoden Fernando K, Maltagliati Liliana Á, de Castro Ferreira Conti Ana C, Almeida-Pedrin Renata R, Filho Leopoldino C, de Almeida Cardoso Maurício
Department of Orthodontics, Sagrado Coracao University Bauru, São Paulo, Brazil.
Private Practice, São Paulo, Brazil.
J Contemp Dent Pract. 2016 Aug 1;17(8):623-9. doi: 10.5005/jp-journals-10024-1901.
The objective of this study was to evaluate the anterior teeth position changes obtained by passive self-ligating brackets using cone beam computed tomography (CBCT).
Twenty patients with a mean age of 16.5 years, class I malocclusion, constricted maxillary arch, and teeth crowding above 5 mm were enrolled in this study, and treated by passive orthodontic self-ligating brackets. A sequence of stainless steel thermoset wire was implemented with ending wire of 0.019" × 0.025". The CBCT and dental casts were obtained prior to the installation of orthodontic appliances (T1), and 30 days after rectangular steel wire 0.019" × 0.025" installation (T2). The measurements in CBCT were performed with the Anatomage software, and the dental casts were evaluated with a digital caliper rule with an accuracy of 0.01 mm.
The CBCT data demonstrated mean buccal inclination of the upper and lower central incisors ranging from 6.55° to 7.24° respectively. The upper and lower lateral incisors ranged from 4.90° to 8.72° respectively. The lower canines showed an average increase of 3.88° in the buccal inclination and 1.96 mm in the transverse intercuspal distance. The upper canines showed a negative inclination with mean average of -0.36°, and an average increase of 0.82 mm in the transverse distance, with negative correlation with the initial crowding.
Treatment with passive self-ligating brackets without obtaining spaces increases buccal inclination of the upper and lower incisors with no correlation with the amount of initial teeth crowding. The intercanine distance tends to a small increase showing different inclinations between the arches.
When taking into account the self-ligating brackets, the amount of initial dental crowding is not a limitation factor that could increase the buccal inclination of the anterior teeth.
本研究的目的是使用锥形束计算机断层扫描（CBCT）评估被动式自结扎托槽引起的前牙位置变化。
本研究纳入了20例平均年龄16.5岁、安氏I类错牙合、上颌弓狭窄且牙列拥挤超过5mm的患者，采用被动正畸自结扎托槽进行治疗。使用一系列不锈钢热固性弓丝，终末弓丝为0.019"×0.025"。在安装正畸矫治器前（T1）以及安装0.019"×0.025"矩形钢丝30天后（T2）获取CBCT和石膏模型。使用Anatomage软件进行CBCT测量，使用精度为0.01mm的数字卡尺对石膏模型进行评估。
CBCT数据显示，上下中切牙的平均颊倾度分别为6.55°至7.24°。上下侧切牙的平均颊倾度分别为4.90°至8.72°。下尖牙的颊倾度平均增加3.88°，横向牙尖间距离平均增加1.96mm。上尖牙呈负向倾斜，平均为-0.36°，横向距离平均增加0.82mm，与初始拥挤度呈负相关。
使用被动自结扎托槽且未获得间隙的治疗会增加上下切牙的颊倾度，且与初始牙列拥挤量无关。尖牙间距离有小幅增加趋势，且上下牙弓的倾斜度不同。
考虑到自结扎托槽时，初始牙列拥挤量并非增加前牙颊倾度的限制因素。
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