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首页> 外文期刊>British journal of oral & maxillofacial surgery >The accuracy of preoperative orthognathic predictions.
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The accuracy of preoperative orthognathic predictions.

机译：术前正颌预测的准确性。

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摘要

We assessed the accuracy of preoperative OPAL trade mark orthognathic predictions by retrospective analysis of 25 Class II patients who had had orthodontic treatment combined with mandibular advancement osteotomy. Preoperative and postoperative lateral cephalographs were digitised and surgical predictions generated using OPAL software. Each prediction was compared with the corresponding clinical changes. We also made a method error study by doing a random retracing of 25 cephalographs. Predictions of some of the principal OPAL values (SNA, ANB, LAFH%, OJ, OB) were reasonably accurate in terms of mean values. However, there were large individual variations for most variables and predictions of the vertical skeletal, incisor, and Wits measurements were imprecise. In particular, there was a bias towards under-prediction of the vertical skeletal changes when there was more backward mandibular rotation than anticipated. Immediate postoperative cephalographs were also affected by a 2.1mm mean downward displacement of the mandible as a result of the surgical wafer.
机译：我们通过回顾性分析25例接受正畸治疗联合下颌前移截骨术的II类患者，评估术前OPAL商标正颌预测的准确性。术前和术后侧位头颅造影仪被数字化，并使用OPAL软件生成手术预测。将每个预测与相应的临床变化进行比较。我们还通过随机追踪25台头显仪进行了方法错误研究。就平均值而言，某些主要OPAL值（SNA，ANB，LAFH％，OJ，OB）的预测是相当准确的。但是，大多数变量存在较大的个体差异，并且垂直骨骼，门牙和Wits的预测不精确。特别是，当下颌后旋旋转比预期的多时，垂直骨骼变化的预测不足会产生偏见。手术后立即下颌头颅造影也受到下颌平均2.1mm向下位移的影响。

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