Bailoor D N, Muralidhar M, Moola A D
Oral Medicine, KMC, College of Dental Surgery, Mangalore.
J Pierre Fauchard Acad. 1994 Dec;8(4):137-42.
26 dry specimens of mandible were utilised for making antropometric & condylo coronal angle measurements. 26 living subjects were radiographed in a standardized SMV an CCA values were established. Average value of Antero posterior dimension was obtained to be 8.5 mm and latero medial dimension obtained to be 17 mm. Left and right condylo coronal angle (CCA) from dry specimens was assessed to be 18 & 16 respectively. From the living subjects CCA was established as 17 degrees in Indian population. The following radiological implications are evident from this study. (1) A tomographic cut of the TMJ if done at the depth of 8 to 9 mm i.e. half of 17 mm (lateromedial dimension average) it would pass through the centre of the condyle and may contribute to the diagnostic importance. (2) The CCA of 17 degrees obtained for Indian population may be utilized by clinicans to obtain clearer transpharyngeal and transcranial views of the TMJ by adjusting the radiographic cone to 17 degrees tilt in horizontal angulation keeping the standard values for vertical angulation as--10 degrees for transpharyngeal and +25 degrees for transcranial views.
使用26个下颌骨干燥标本进行人体测量和髁突冠状角测量。对26名活体受试者进行标准化的颏顶位投照，并确定CCA值。前后径的平均值为8.5毫米，内外径的平均值为17毫米。干燥标本的左右髁突冠状角（CCA）分别评估为18度和16度。在印度人群中，活体受试者的CCA确定为17度。这项研究有以下明显的放射学意义。（1）如果在8至9毫米深度（即17毫米（内外径平均值）的一半）进行颞下颌关节断层扫描，它将穿过髁突中心，可能具有诊断重要性。（2）印度人群获得的17度CCA值，临床医生可通过将X线投照锥在水平角度调整为17度倾斜，同时保持垂直角度的标准值（经咽侧位为-10度，经颅位为+25度），以获得更清晰的颞下颌关节经咽侧位和经颅位图像。
