Accuracy of Predicting Lateral Soft Tissue Profile in Skeletal Mandibular Prognathism Using Bland-Altman Analysis

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  • Bland-Altman分析を用いた骨格性下顎前突症における軟組織側貌予測の正確度について
  • Bland-Altman ブンセキ オ モチイタ コッカクセイ カガク ゼントツショウ ニ オケル ナンソシキガワボウヨソク ノ セイカクド ニ ツイテ

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Abstract

This study evaluated the prediction of facial profile in patients with skeletal mandibular prognathism at each stage of facial treatment. Specifically, the accuracy of manual prediction using tracing paper （following MP） and digital prediction using Dolphin Imaging software （version 11.0；GC Ortholy, Tokyo） （following IS） were compared. Fifteen patients （4 males and 11 females, mean age 23.6 years） underwent sagittal splitting ramus osteotomy for correction of skeletal mandibular prognathism, and the temporal changes of hard and soft tissues from the initial examination （T0） and just before orthognathic surgery （T1） to within 1 month from the end of postoperative orthodontic treatment （T2）, respectively were evaluated. The MP and IS values were calculated by predicting the change in soft tissue over time from the change in hard tissue over time and compared with the measured values （AC values）. Four measurement points on the hard tissue and five points on the soft tissue of a standard lateral X-ray photograph were used for comparison, and Bland–Altman analysis was used. The results showed that there was a fixed error in prediction at T2, with MP values predicting the upper and lower lips excessively upward and the soft tissue Pog excessively posterior. In addition, the IS values showed a fixation error that predicted the upper lip excessively upward, the lower lip excessively posterior, and the soft tissue Me excessively posterior. Thus, the results suggest that the prediction of lateral morphology after preoperative orthodontic and dynamic orthodontic treatment for patients with skeletal mandibular prognathism may lead to excessive patient expectations.

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