Distance between mandibular canal and third molar root among 20-year-old subjects

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Rytkönen , K & Ventä , I 2018 , ' Distance between mandibular canal and third molar root among 20-year-old subjects ' , Clinical Oral Investigations , vol. 22 , no. 7 , pp. 2505-2509 . https://doi.org/10.1007/s00784-018-2346-9

Title: Distance between mandibular canal and third molar root among 20-year-old subjects
Author: Rytkönen, Kaisa; Ventä, Irja
Contributor organization: Clinicum
Department of Oral and Maxillofacial Diseases
University of Helsinki
HUS Head and Neck Center
Date: 2018-09
Language: eng
Number of pages: 5
Belongs to series: Clinical Oral Investigations
ISSN: 1432-6981
DOI: https://doi.org/10.1007/s00784-018-2346-9
URI: http://hdl.handle.net/10138/304108
Abstract: The aim of the study was to evaluate the proximity of the mandibular third molar (M3) and the inferior alveolar canal (IAC) in a panoramic radiograph of 20-year-old subjects. The specific aim was to assess differences in this proximity over time. Two similar samples of panoramic radiographs taken in a routine oral health examination with 20-year time interval were examined retrospectively and images with both mandibular M3s were included. The material consisted of 300 subjects (25% men, mean age 20.5 +/- 0.6 years). The radiographic relationship between the mandibular M3 root and the IAC was assessed as follows: the M3 root was either apart from, tangential to, superimposed with, or inferior to the IAC. Differences between frequencies were tested using the chi-squared test. In the combined samples, only 16% of the M3s located apart from the IAC, 15% located tangential to, 61% superimposed with, and 8% inferior to the IAC. The proportion of the intimate locations had increased during the 20-year time interval from 79 to 88% (P <0.01) and especially in females (P <0.05). The vast majority of the mandibular M3s situated very close to the mandibular canal. Our results suggest that in the cohort of 20-year-old non-extraction subjects, most of the M3s are possibly at risk for inferior alveolar nerve injury at removal, as judged from the panoramic radiograph, and also the number of such teeth has increased over the 20-year period.
Subject: 313 Dentistry
Peer reviewed: Yes
Usage restriction: openAccess
Self-archived version: publishedVersion

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