Measurement Accuracy of Condylar Position on Corrected Lateral Tomography of Temporomandibular Joint with Scanora Multimodal Radiography.

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  • Hiruma Takayoshi
    The First Department of Prosthodontics, Showa University School of Dentistry
  • Suganuma Takeshi
    The First Department of Prosthodontics, Showa University School of Dentistry
  • Funato Masahiko
    The First Department of Prosthodontics, Showa University School of Dentistry
  • Hiruma Yukiko
    The First Department of Prosthodontics, Showa University School of Dentistry
  • Shinya Akiyuki
    The First Department of Prosthodontics, Showa University School of Dentistry
  • Furuya Ryoichi
    The First Department of Prosthodontics, Showa University School of Dentistry
  • Kawawa Tadaharu
    The First Department of Prosthodontics, Showa University School of Dentistry
  • Seki Kenji
    Department of Oral Radiology, Showa University School of Dentistry
  • Sano Tsukasa
    Department of Oral Radiology, Showa University School of Dentistry
  • Okano Tomohiro
    Department of Oral Radiology, Showa University School of Dentistry

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  • 多機能断層装置Ｓｃａｎｏｒａの顎関節修正側方位断層撮影法におけるか頭位の測定精度

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Abstract

Accurate measurement of the condylar position is important for diagnosis and treatment of temporomandibular joint (TMJ) dysfunction. Radiography has been used for this purpose and recently, Scanora® multimodal radiography was introduced to Showa University. The projection capacity of the Scanora® in TMJ is still unclear. The purpose of this study was to estimate the accuracy of the measurement of the condylar position on sagittal tomography with Scanora® and to compare Scanora® images with LGM-1 images. Six TMJs obtained from dried skulls were used. Impressions of the joint space were obtained in order to estimate the actual dimensions. The Scanora® images, LGM-1 images, and impressions were measured with a profile projector. The results were as follows: 1) The measurement error of condylar position on Scanora® with a mean value of 0.29mm was similar to that on LGM-1 (0.25mm). 2) The measurement errors on both images in 1 of 6 TMJs were especially great (Scanora: 0.72mm, LGM-1: 0.87mm) while the measurement of the other 5 TMJs on both images showed smaller mean errors (Scanora: 0.2mm, LGM-1: 0.12mm). Therefore, there may be a considerable value of errors in the measurement on both images in the case of particular morphological types of joints. 3) It showed that the measurement errors of Y coordinates were larger than those of X coordinates. 4) The projection grade of both images were similar. These results suggested that sagittal tomography on Scanora® is useful for clinical estimate of the condylar position.

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