A study on improvement and application of intra oral jaw tracking device in six-degree of freedom

口腔内六自由度颌跟踪装置的改进及应用研究

• 批准号: 04454487
• 负责人: BANDO Eiichi
• 金额: $ 4.16万
• 依托单位: The University of Tokushima, School of Dentistry
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04454487/
• 关键词: Jaw tracking device; Jaw movement in six-degree of freedom; Mandibular movement; 顎口腔系; 診断システム

The Purpose of this research is to develop a new jaw tracking device by using two magnetic fields in quadrature phase. The overall features of this device are as follows. 1) The device measures upper and lower jaws movement independently in six degrees of freedom. 2) That has no mechanical connection between upper and lower jaws and does not prevent any natural jaw function as mastication, 3) The accuracy is 10 micrometer and sampling rate is 300 Hz, 4) The intra oral sensor parts are small enough not to disturb any dental practice usuing in daily dental clinics.The device involves large primary coils which make magnetic fields and small secondary coils which are attached to upper and lower jaws. Locations of jaw are correspond with out-put signals of secondary coils induced by magnetic fields.We tested several type devices.1. Primary coil : 1) Air core coil of 60cm cube2) Air core coil of 180cm cube3) Permalloy core coil of 45cmx38cmx18cm rectangular parallelepipes2. Phase detector : 1) Comparator and 16 bit up-down counter2) FFTThis study revealed that 18-24 bit A/D converter, 64 bit CPU and 1024-8192 points FFT analysis are required for extremely high resolution jaw movement analysis.All basic technical problems for developing the new jaw tracking device are resolved by this study.

本研究的目的是研制一种新型的利用双磁场正交相位的下颌跟踪装置。该装置的总体特征如下。1)该设备在六个自由度上独立地测量上下颌运动。2)上下颌之间没有机械连接，不妨碍咀嚼时的任何自然颌功能，3）精度为10微米，采样率为300 Hz，四、口腔内传感器部件足够小，不会干扰日常牙科诊所的任何牙科实践。该设备包括产生磁场的大型初级线圈和连接到上部的小型次级线圈。和下颚。钳口的位置与次级线圈在磁场作用下的输出信号相对应。初级线圈：1）60立方厘米空芯线圈2）180立方厘米空芯线圈3）45厘米× 38厘米× 18厘米长方体坡莫合金芯线圈2.相位检测器：1）比较器和16位升降计数器2）FFT本研究表明，要实现极高分辨率的颌运动分析，需要18-24位A/D转换器、64位CPU和1024-8192点FFT分析，解决了研制新型颌运动跟踪装置的所有基本技术问题。

项目成果

Bando, E.: Advanced dentistry series [2] Gaku-kinou shogai-Atarashii shindan-shisutemu to chiryo-shinshin (Color atlas of temporomandibular disorders-New system of diagnosis and therapy)(in Japanese). Ishiyaku publishiers, INC., 332 (1993)

Bando, E.：高级牙科系列 [2] Gaku-kinou shogai-Atarashii shindan-shisutemu to chiryo-shinshin（颞下颌疾病彩色图谱 - 诊断和治疗的新系统）（日语）。

Akemi Takai: "Comparative study on reproducibility of three occlusal examination methods" 四国歯科学会雑誌. 7. 39-47 (1994)

Akemi Takai：“三种咬合检查方法再现性的比较研究”四国牙科学会杂志 7. 39-47 (1994)。

Motoharu Kori: "Development of six degree of freedom jaw tracking device utilizing two magnetic fields in quadrature phase and measurement of jaw movement." Dentistry in Japan. 31(in Press). (1994)

Motoharu Kori：“利用正交相位的两个磁场开发六自由度颌跟踪装置并测量颌运动。”

大久保 由紀子: "顎運動に調和した咬合" 歯界展望. 別冊. 173-182 (1992)

大久保由纪子（Yukiko Okubo）：“咬合与下颌运动的协调”《牙科世界的观点》173-182（1992）。

Keisuke Nishigawa: "Effect of altered occlusal guidance on lateral border movement of the mandible" The Journal of Prosthetic Dentistry. 68. 965-969 (1992)

Keisuke Nishikawa：“改变咬合引导对下颌骨横向边缘运动的影响”《修复牙科杂志》。