歯科放射線
Online ISSN : 2185-6311
Print ISSN : 0389-9705
ISSN-L : 0389-9705
資料
日本大学松戸歯学部付属病院放射線科の10年間のMDCT画像を用いた過剰歯の埋伏状態の検討
関谷 恵子徳永 悟士原 慶宜関谷 浩太郎末光 正昌能田 茉莉江澤田 絵理飯塚 紀仁金田 隆
著者情報
キーワード: MDCT, 過剰歯, 埋伏位置, 埋伏方向
ジャーナル フリー

2019 年 58 巻 2 号 p. 89-94

詳細
抄録

Multidetector computed tomography (MDCT) was introduced to Nihon University School of Dentistry at Matsudo Hospital in April 2006. Supernumerary teeth are anomalous extra teeth. They are often encountered in daily clinical practice and can cause dental alignment problems, depending on the impaction position, and so dental extraction is sometimes necessary. It is important to accurately assess the position and form of supernumerary teeth and their relationships with the adjacent tissues on CT examinations. Furthermore, CT is required to make decisions regarding tooth extraction and the timing of treatment in the clinical setting.  The objective of this study was to investigate the characteristic clinical findings of supernumerary teeth by analyzing a large number of MDCT images.  Of the 34,002 patients who underwent MDCT examinations at our radiology department between April 2006 and March 2016, the subjects were 855 patients with impacted supernumerary teeth (1,081 teeth).  The following results were obtained:  1. The 855 patients consisted of 579 males (67.7%) and 276 females (32.3%).  2. The patients’ ages ranged from 4 to 87 years old, and their median age was 9 years old. Most cases (499, 58.4%) involved patients aged <10 years old.  3. Four hundred and forty-three (51.8%), 293 (34.3%), and 93 (10.9%) MDCT scans were ordered by the Division of Oral Surgery, the Division of Pediatric Dentistry, and other divisions at our hospital, respectively, and 26 (3.0%) were ordered by another hospital.  4. The total number of impacted supernumerary teeth was 1,081, with the highest number (652 teeth, 60.4%) seen in the median maxillary region (mesiodens).  5. Forty-five (4.2%) and 1,036 (95.8%) teeth were impacted on the labial and palatal side, respectively.  6. As for the direction of the tooth crown and root, 248 (22.9%), 146 (13.5%), and 687 (63.6%) teeth were classified as normal, horizontal, and inverted, respectively.  It was confirmed that the optimal treatment policy for impacted supernumerary teeth can be determined by confirming the exact position of each impacted tooth on MDCT.

著者関連情報
© 2019 特定非営利活動法人 日本歯科放射線学会
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