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Temporomandibular joint radiography in private dental clinic

私人牙科诊所颞下颌关节X光检查

基本信息

批准号：
07457447
负责人：
UEMURA Shusaburo
金额：
$ 4.22万
依托单位：
THE UNIVERSITY OF TOKUSHIMA
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

Patients with temporomandibular disorsers who visit on a private dental clinic increase year after year. To develope a new technique for the temporomandibular joint (TMJ) radiography using a panoramic x-ray unit in the clinic, basic principles of panoramic TMJ image formation were investigated from a clinical point of view. Mandibular condyle should be put into the image layr of the unit to get a sharp image of the TMJ.Intercondylar distances in 848 Japanese subjects were measured on submentovertical view to make clear the position of mandibular head relative to the effective image layr. The mean value of intercondylar distance was found to be constant in every decades more than 20 years old, that is, 101.1 (SD4.7) mm in female and 106.1 (SD5.3) mm in male respectively. To get a sharp image of TMJ,three size of image layr, 96,101 and 106mm in intercondylar distance, should be at least prepared for child, femal and male.In the second study, a optimum horizontal angulation of x-ray beam … More for TMJ radiography was experimentally surveyed. Eleven human dried speciemen with mandible fixed in edge to edge occlusion were rotated on axis clockwise or counter clockwise step by 5 degrees and exposed in every rotation. Thirteen images of each speciemen were examined and maximum rotation angle without superimposition of mastoid on the condyle was selected for a recommended projection. The angle proved to be less than 32 degrees antero-medially to the frontal plane in 9 out of 11 speciemen.In the third study, 72 autopsy mandibular condyles were radiographed in two different panoramic projections, of which angle is 18 degrees postero-medially (lateral mode) and 30 degrees antero-medially (oblique mode) to frontal plane. And then, accuracy, sensitivity and specificity of each projection were caluculated compared to tomographic findings as a gold standard. Accuracy, sensitivity and specificity of oblique mode in detecting an abnormal finding i.e. erosion are all higer than the lateral mode. On the contrary, those of lateral mode are higer than the oblique mode in detecting osteophyte formation.To get reliable informations of the TMJs with rotational panoramic unit alone, it should be equipped with the two modes. Less

在私人牙科诊所就诊的颞下颌疾病患者逐年增加。本文从临床角度探讨了颞下颌关节（TMJ）全景x线片成像的基本原理，以期开发一种应用于临床的颞下颌关节（TMJ）全景x线片成像新技术。下颌髁应置于该单元的图像层中，以获得TMJ的清晰图像。对848名日本受试者进行了髁间距离测量，以明确下颌头相对于有效图像层的位置。20岁以上患者的髁间距离平均值为101.1 (SD4.7) mm，男性为106.1 (SD5.3) mm。为获得清晰的TMJ图像，儿童、女性和男性至少应准备96,101和106mm的髁间距离三种尺寸的图像层。在第二项研究中，对TMJ x射线成像的最佳水平角度进行了实验研究。将11例下颌骨边对边咬合固定的人干标本沿轴顺时针或逆时针方向旋转5度，每旋转一次暴露。检查了每个标本的13张图像，并选择了乳突与髁上不重叠的最大旋转角度作为推荐投影。在11个样本中，有9个样本的前内侧夹角小于32度。在第三项研究中，对72个尸检髁进行了两种不同的全景投影x线摄影，其角度为后内侧18度（侧位模式）和前内侧30度（斜位模式）。然后，将每个投影的准确性、灵敏度和特异性与断层扫描结果作为金标准进行比较。斜位模式检测异常如侵蚀的准确性、敏感性和特异性均高于侧位模式。相反，在检测骨赘形成时，侧位模式高于斜位模式。为了获得单独旋转全景单元的tmj的可靠信息，它应该配备两种模式。少