Gupta Rishabh, Shivaprakash Gowdara, Manohar Mala R
Department of Orthodontics and Dentofacial Orthopaedics Institute of Dental Sciences, Jammu, Jammu and Kashmir, India, Phone: +919419987170, e-mail:
Department of Orthodontics and Dentofacial Orthopedics College of Dental Sciences, Davangere, Karnataka, India.
J Contemp Dent Pract. 2018 Jan 1;19(1):20-29. doi: 10.5005/jp-journals-10024-2206.
The aim of the study was to evaluate the clinical effectiveness of MBT™ preadjusted edgewise appliance (PEA) in terms of achieving the optimal expression of its built-in characteristics of tip, torque, and in-out.
Pretreatment and posttreatment study models of 20 subjects who received full fixed appliance treatment involving four first premolar extractions using the MBT™ appliance were measured for tip, torque, and in-out using the method described by Andrews. Treatment changes were analyzed statistically, and the posttreatment measurements were compared with the MBT™ specifications as well as Andrews' values for the above-mentioned parameters.
Except for the maxillary canines and second premolars, the built-in tip of MBT™ appliance was nearly fully expressed, though there was some lack of correlation with Andrews' values. Despite the fact that the full amount of torque built into the MBT™ appliance was not expressed, torque measurements for all teeth except the maxillary second premolars and the first molars showed either no statistically significant difference or were significantly higher than Andrews' values for these teeth. In-out readings were lower than both MBT™ and Andrews' values, but the relative order of crown prominences was similar. Conclusion and clinical significance: The MBT™ appliance is thus effective in ensuring a successful treatment result, though individual adjustments may be necessary for optimal tooth positioning at the end of the treatment, as with any preadjusted appliance.
本研究旨在评估MBT™预成直丝弓矫治器（PEA）在实现其内置的倾斜、转矩和内外倾特性最佳表现方面的临床效果。
对20名接受使用MBT™矫治器拔除四颗第一前磨牙的全固定矫治器治疗的患者的治疗前和治疗后研究模型，采用安德鲁斯描述的方法测量倾斜、转矩和内外倾。对治疗变化进行统计学分析，并将治疗后的测量结果与MBT™规格以及上述参数的安德鲁斯值进行比较。
除上颌尖牙和第二前磨牙外，MBT™矫治器的内置倾斜几乎完全表现出来，尽管与安德鲁斯值的相关性存在一定欠缺。尽管MBT™矫治器内置的全部转矩未完全表现出来，但除上颌第二前磨牙和第一磨牙外，所有牙齿的转矩测量值要么无统计学显著差异，要么显著高于这些牙齿的安德鲁斯值。内外倾读数低于MBT™和安德鲁斯值，但牙冠突出的相对顺序相似。结论及临床意义：因此，MBT™矫治器在确保治疗成功方面是有效的，不过与任何预成矫治器一样，在治疗结束时可能需要进行个别调整以实现最佳的牙齿定位。
