下顎の非対称性と下顎頭に対する顎関節円板の位置との関係―ヘリカルＣＴによる下顎骨の三次元距離計測とＭＲＩによる検討

• 田中 礼

  新潟大学大学院医歯学総合研究科口腔生命科学専攻顎顔面再建学講座顎顔面放射線学分野

• 林 孝文

  新潟大学大学院医歯学総合研究科口腔生命科学専攻顎顔面再建学講座顎顔面放射線学分野

書誌事項

タイトル別名

• Relationship between Mandibular Asymmetry and Articular Disc Position Relative to the Mandibular Condyle
• ヘリカルCTによる下顎骨の三次元距離計測とMRIによる検討

抄録

Objective: To investigate the relationship between the length of the mandible and articular disc position in the temporomandibular joint using information obtained with magnetic resonance (MR) imaging and helical computed tomography (CT).<BR>Materials and Methods: Ninety patients with jaw deformity who were candidates for surgical orthodontic treatment were examined with MRI and CT. One-hundred and eighty joints of 78 patients were classified into the following three categories according to the articular disc position observed on MR imaging: superior positioned type (type S), anterior positioned type (type A), and slightly posterior positioned type (type P). Each patient was assigned to one of six groups, according to the combination of disc positions on both TMJ's: S/S, A/A, P/P, S/A, A/P, and S/P. For 3D CT measurement of the mandibular length, the apex of the mandibular condyle (Co), the narrowest point of the mandibular incisure (In), the most lateral point on the mandibular angle (An), mental foramen (Fo), and Pogonion (Po) were assigned as reference points. Differences between Co-Po distances on both sides were evaluated as the reference for mandibular asymmetry, and correlated with articular disc position in each group. In the asymmetry group, differences between Co-In, In-An, An-Fo, and Fo-Po distances on both sides were also evaluated and correlated with articular disc position.<BR>Results: Differences between Co-Po distances on both sides were greatest in the A/P group, followed by the S/A, S/P, A/A, S/S, and P/P groups in descending order. In every case of S/A group and P/A group, mandibular midline displacement was observed on the side of the type A disc position. In the S/P group, the mandibular midline of each case shifted toward the side of the type S disc position. The difference between Co-In distances on both sides was greatest, especially in the A/P group. Of all cases of the S/A, A/P, and S/P groups, Co-In distances were longer on the side of the type P disc position, and were shorter on the type A side.<BR>Conclusion: The present investigation indicated that mandibular asymmetries were much greater in groups with different types of articular disc position in both joints than in groups with the same types of disc position in both joints. In groups with different types of articular disc position, it was suggested that the shorter side of the mandible might relate to the anteriorly positioned articular disc, and the longer side of the mandible might relate to the posteriorly positioned articular disc.

収録刊行物

• 日本顎変形症学会雑誌

  日本顎変形症学会雑誌 13 (1), 12-20, 2003

  特定非営利活動法人 日本顎変形症学会

キーワード

• 下顎非対称
• 顎関節円板の位置
• 三次元計測

詳細情報

• CRID: 1390001204449926912
• NII論文ID: 130004090761
• NII論文ID: 10020407930
• NII書誌ID: AN10366185
• DOI: 10.5927/jjjd1991.13.12
• ISSN: 18845045
• ISSN: 09167048
• ISSN: http://id.crossref.org/issn/09167048
• Web Site: https://search.jamas.or.jp/link/ui/2004039663
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可