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Pre-operative radiographic evaluation of lower third molars with computed tomography
Department of Radiology, Sunderby Hospital, SE-971 80, Luleå, Sweden.ORCID iD: 0000-0001-8229-5428
2006 (English)In: Dento-Maxillo-Facial Radiology, ISSN 0250-832X, E-ISSN 1476-542X, Vol. 35, no 1, 30-35 p.Article in journal (Refereed) Published
Abstract [en]

OBJECTIVES: To report radiographic findings of examinations with computed tomography (CT) of impacted lower third molars with an intimate relation to the mandibular canal and to investigate how findings of a dark band across the roots of the lower third molar on panoramic views correspond to the CT findings.

METHODS: CT images of 90 lower third molars (64 patients, mean age 34.6 years) in which plain radiography was insufficient to allow determination of the precise anatomical relations were reviewed retrospectively. Panoramic views of 88 teeth existed; these images were interpreted independent of the CT examinations with respect to presence of a dark band across the roots.

RESULTS: In 31% of the CT images, the course of the mandibular canal was buccal, in 33% lingual, in 26% inferior, and in 10% inter-radicular. The tooth was in contact with the mandibular canal in 94% and with the lingual cortex in 86%. In 23%, grooving of the root by the canal was judged to be present. In 63% of the cases where a dark band across the roots was observed on panoramic radiographs, CT revealed grooving of the root.

CONCLUSIONS: Pre-operative CT of lower third molars is motivated in selected cases when plain radiography is inconclusive. The finding of a dark band across the roots on panoramic radiographs is an indicator of grooving of the tooth by the canal and justifies a pre-operative CT examination. The absence of dark bands on panoramic views does not exclude grooving of the roots.

Place, publisher, year, edition, pages
British institute of radiology , 2006. Vol. 35, no 1, 30-35 p.
Keyword [en]
computed tomography; inferior alveolar nerve; radiography; third molar
National Category
Radiology, Nuclear Medicine and Medical Imaging
Identifiers
URN: urn:nbn:se:umu:diva-89544DOI: 10.1259/dmfr/58068337ISI: 000235275200006PubMedID: 16421261OAI: oai:DiVA.org:umu-89544DiVA: diva2:721484
Available from: 2014-06-04 Created: 2014-06-04 Last updated: 2017-12-05Bibliographically approved

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Flygare, Lennart
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