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

Kaisa Rytkönen, Irja Ventä

Research output: Contribution to journalArticleScientificpeer-review

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.

Original languageEnglish
JournalClinical Oral Investigations
Volume22
Issue number7
Pages (from-to)2505-2509
Number of pages5
ISSN1432-6981
DOIs
Publication statusPublished - Sep 2018
MoE publication typeA1 Journal article-refereed

Fields of Science

  • 313 Dentistry
  • MOLAR THIRD
  • PANORAMIC RADIOGRAPH
  • INFERIOR ALVEOLAR CANAL
  • EXTRACTION
  • INFERIOR ALVEOLAR
  • COMPUTED-TOMOGRAPHY
  • SURGERY
  • ERUPTION
  • REMOVAL
  • INJURY

Cite this

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title = "Distance between mandibular canal and third molar root among 20-year-old subjects",
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.",
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Distance between mandibular canal and third molar root among 20-year-old subjects. / Rytkönen, Kaisa; Ventä, Irja.

In: Clinical Oral Investigations, Vol. 22, No. 7, 09.2018, p. 2505-2509.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Distance between mandibular canal and third molar root among 20-year-old subjects

AU - Rytkönen, Kaisa

AU - Ventä, Irja

PY - 2018/9

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N2 - 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.

AB - 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.

KW - 313 Dentistry

KW - MOLAR THIRD

KW - PANORAMIC RADIOGRAPH

KW - INFERIOR ALVEOLAR CANAL

KW - EXTRACTION

KW - INFERIOR ALVEOLAR

KW - COMPUTED-TOMOGRAPHY

KW - SURGERY

KW - ERUPTION

KW - REMOVAL

KW - INJURY

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DO - 10.1007/s00784-018-2346-9

M3 - Article

VL - 22

SP - 2505

EP - 2509

JO - Clinical Oral Investigations

JF - Clinical Oral Investigations

SN - 1432-6981

IS - 7

ER -