Relation between mandibular third molar and mandibular canal as assessed by three-dimensional Computed tomographic reconstruction.
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- TANAKA Toshinori
- Medical Foundation Itohkai Itoh Dental Clinic
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- MURAKAMI Kei
- Medical Foundation Itohkai Itoh Dental Clinic
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- KISHIDA Tsuyoshi
- Medical Foundation Itohkai Itoh Dental Clinic
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- ITOH Takatoshi
- Medical Foundation Itohkai Itoh Dental Clinic
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- MORITA Yasuhiko
- Department of Oral and Maxillofacial Radiology, Kagoshima University School of Dentistry
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- NOIKURA Takenori
- Department of Oral and Maxillofacial Radiology, Kagoshima University School of Dentistry
Bibliographic Information
- Other Title
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- 下顎智歯と下顎管との位置関係に関する3次元CT画像による観察
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Abstract
Mandibular third molars are usually located near the inferior alveolar nerve. Their surgical removal may damage the nerve and cause dysesthesia of the lower lip. Panoramic radiography is often used preoperatively to estimate the distance between the mandibular third molars and the inferior alveolar nerve. However, the buccolingual relation of these structures cannot be determined by this method.<BR>Three-dimensional Computed tomography (3 D-CT) is more useful in diagnosis than panoramic radiography. This study was designed to assess the diagnostic value of 3 D-CT.<BR>A total of 209 mandibular third molars in 138 patients were evaluated by both 3 D-CT and panoramic radiography. We classified the radiographic relation between tooth roots and the mandibular canal into 5 types. The types were recorded for each panoramic radiograph and 3 D-CT scan.<BR>3 D-CT findings: 49 teeth showed Type 1; 45 of 49 teeth showed exposure of the inferior alveolar nerve.<BR>Panoramic radiograph findings: 82 teeth showed Type 1; 38 of 82 teeth showed exposure of the inferior alveolar nerve. There was a significant difference between 3 D-CT findings and panoramic radiographic findings (p<0.05).<BR>Patients with loss of the superior white line of the canal on panoramic radiographs had a high incidence of nerve exposure during surgery (p<0.005). There was also a correlation between radiographic loss of the superior white line and closeness of the tooth and canal on 3 D-CT (p<0.05). These findings are clinically important.<BR>We conclude that 3 D-CT provides clinically useful information with respect to the relation between the mandibular third molars and the mandibular canal.
Journal
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- Japanese Journal of Oral and Maxillofacial Surgery
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Japanese Journal of Oral and Maxillofacial Surgery 46 (5), 251-261, 2000
Japanese Society of Oral and Maxillofacial Surgeons
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Details 詳細情報について
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- CRID
- 1390001206529881728
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- NII Article ID
- 10006381665
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- NII Book ID
- AN00189163
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- ISSN
- 21861579
- 00215163
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- Text Lang
- ja
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed