Verification of CT-image and dental-model matching errors from the metal-artifacts in orthognathic surgery planning

2023 Fiscal Year Final Research Report

• Project/Area Number: 19K19275
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 57070:Developmental dentistry-related
• Research Institution: Yokohama City University
• Principal Investigator: IMAI HARUKI 横浜市立大学, 附属市民総合医療センター, 助教 (80735837)
• Project Period (FY): 2019-04-01 – 2024-03-31
• Keywords: 顎矯正手術 / アーチファクト

Outline of Final Research Achievements

Regarding the planning of orthognathic surgery or fabricating CAD/CAM splint, accurate alignment of the CT images of jaw bones and digital data of dental arches may be difficult if the artifacts (AF) exist on the CT images. In this study, we focused on this point and prepared multiple AF models with different numbers and distributions of metal prosthetics using the maxillary and mandibular dental phantoms, and verified the alignment errors between the CT images and dental arches. The results showed that AF tended to increase with the number of prostheses and that the errors in the vertical direction were larger than those in the anterior-posterior and lateral directions. The effects of AF are usually clinically acceptable, but caution should be exercised when the many prostheses are widely distributed.

Free Research Field

矯正歯科

Academic Significance and Societal Importance of the Research Achievements

今回得られた補綴物の金属総重量とアーチファクト体積の線形関係や、前後・左右方向に比べて上下方向の誤差が生じやすいとの知見は、ソフトウェアを操作する医師にとって、より精度の高い作業を行う上で臨床上有益なものである一方、患者利益にも寄与するものと考えられる。とくに国内では、保険診療制度の影響に加え近年の顎変形症患者の年齢層の多様化により、依然として患者口腔内に金属製補綴物が認められることが多いため、本研究の社会的意義は大きいものと考えられる。