Positioning of the condyle where it works functionally after surgery by vibration analysis

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K10087
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 57060:Surgical dentistry-related
• Research Institution: Hokkaido University
• Principal Investigator: Matsushita Kazuhiro 北海道大学, 大学病院, 准教授 (10399933)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 口腔外科 / 顎変形症 / 振動解析

Outline of Final Research Achievements

The positioning of the condyle in the glenoid fossa in sagittal split ramus osteotomy is important to achieve long-term stability after surgery. However, there is no objective method to determine this, as it relies solely on the surgeon's experience. Therefore, we have developed a system that vibrates the segmented ramus to search for the actual structures in the fossa.
Three aspects were examined: the method of giving vibration, the method of receiving vibration, and the method of analysis. Vibration was applied at frequencies of around 2000Hz . For the vibration receiving method, an acceleration sensor was implanted in a headset worn on the head to measure the bone conduction frequency percutaneously. However, it was difficult to delineate the waves characteristic of the intra-articular structures, and we were unable to go as far as FFT analysis.

Free Research Field

口腔外科

Academic Significance and Societal Importance of the Research Achievements

下顎頭の位置に配慮しながら離断した骨片同士をプレーティングする手法は、術後の安定性を左右する上でとても重要である。しかし、客観的な手法がないのが問題である。今回、建築業界で一般的である探傷技術を手術に応用した発想が新しいと考える。画像評価ではなく、波動で評価する手法は構造物の物性や質の判断が可能で、機能を予測できる。よって、振動解析は新たな顎関節の評価法として、今後発展することが期待される。