Investigation of Japanese version of IOFTN incorporating maxillofacial morphological indices useful for judging the indications for surgical orthodontic treatment.

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K10158
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 57070:Developmental dentistry-related
• Research Institution: Niigata University
• Principal Investigator: Kobayashi Tadaharu 新潟大学, 医歯学系, 教授 (80195792)
• Co-Investigator(Kenkyū-buntansha): 長谷部 大地 新潟大学, 医歯学総合病院, 助教 (30571905) ; 齋藤 大輔 新潟大学, 医歯学系, 助教 (50826261) ; 齋藤 功 新潟大学, 医歯学系, 教授 (90205633)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 顎変形症 / 外科的矯正治療 / IOFTN / 顎顔面形態分析

Outline of Final Research Achievements

The indications for surgical orthodontic treatment in patients with jaw deformities were examined using the IOFTN developed in the UK combined with facial morphometric analyses. The subjects were 89 patients who underwent surgical orthodontic treatment and 92 patients who underwent orthodontic treatment. Logistic regression analyses showed that IOFTN, MED, and A-B plane angle were selected as explanatory variables in the prediction formula for Class 1; IOFTN and SNA were selected for Class 2; and IOFTN, facial angle, convexity, and Y-axis were selected for Class 3. Therefore, not only IOFTN but also maxillofacial morphometric analyses are important in determining the treatment strategies for patients with jaw deformities, and factors such as patient expectations should be taken into consideration.

Free Research Field

外科系歯学

Academic Significance and Societal Importance of the Research Achievements

本邦において、顎変形症に対する外科的矯正治療が広く行われるようになったが、その適応指標は明確とはなっておらず、外科的矯正治療を最終的に行うかどうかについては、患者の意向によって大きく左右される。一方、IOFTNは、患者の咬合関係や機能障害などの臨床所見から外科的矯正治療の適応について評価する指標として開発されたが、顎顔面形態の評価が含まれていない。本研究では、IOFTNと頭部X線規写真を用いた顎顔面形態分析を組み合わせて外科的矯正治療の適応指標を検討し、顎変形症の病態ごとに提示した点において学術的のみならず社会的にも意義がある。