Use of cone beam computed tomography to assess significant imaging findings related to mandibular third molar impaction

Publication date: Available online 2 August 2017
Source:Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Author(s): LH Matzen, L Schropp, R Spin-Neto, A Wenzel
ObjectiveTo identify risk factors for pathosis related to mandibular third molars observed in CBCT.Study designCBCT-volumes of 410 mandibular third molars were assessed by three observers according to angulation and position of the third molar in relation to the second molar. Moreover, pathosis (marginal bone loss, resorption of the second molar, increased follicular and lingual bone perforation) were assessed. Logistic regression analyses tested if angulation and position of the third molar were risk factors for pathosis.ResultsOn average 41% of second molars had resorption; mesio-angulated (OR 11-107, P<.001) and horizontally positioned (OR 13-120, P<.001) third molars located cervically at the second molar (OR 2-3, P<.027) highly increased the risk. On average 49% of second molars had marginal bone loss; mesio-angulated (OR 16-85, P<.001) and horizontally positioned (OR 61-573, P<.001) third molars increased the risk. For the third molar, an increased follicular space was seen in 25% of cases, distal (OR 5-9, P<.001) and vertical positions (OR 5, P<.002) increased the risk. Lingual bone perforation was not related to a specific angulation.ConclusionSpecific angulations of the mandibular third molar are risk factors for marginal bone loss and resorption of the second molar.



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