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Clinical Trial
. 2022 Jan 25;17(1):e0263094.
doi: 10.1371/journal.pone.0263094. eCollection 2022.

Lingual bone thickness in the apical region of the horizontal mandibular third molar: A cross-sectional study in young Japanese

Shinpei Matsuda  1 , Hitoshi Yoshimura  1
Affiliations
Clinical Trial

Lingual bone thickness in the apical region of the horizontal mandibular third molar: A cross-sectional study in young Japanese

Shinpei Matsuda et al. PLoS One. .

Abstract

Background: Perforation of the lingual plate in the apical region of mandibular third molars will increase the risk of aberration and migration of the root tip and the risk of lingual nerve injury. The aim of this study was to analyze anatomical information, including relationships between the apical region of horizontally impacted mandibular third molars and lingual plates, in young Japanese.

Methods: Japanese patients, with horizontally impacted third molars, who underwent CT examination as a preoperative assessment for mandibular third molar extraction were included, and anatomical characteristics in the apical region of the right mandibular third molar were analyzed, in this study.

Results: A total of 121 patients were included based on the inclusion and exclusion criteria of this study. The mean and standard deviation of the bone thickness on the lingual side of the mandibular third molar in the apical region was 1.5 ± 1.6 mm, and the absence of lingual cortical bone in the apical region, namely, "perforation", was observed in 44 patients. The statistical analysis revealed the predictors of cases with perforation as follows: gender, age, and the available space evaluated by Pell and Gregory classification.

Conclusions: This study clarified that "perforation" was sometimes observed in young Japanese, and that the predictors of those cases were as follows: gender, age, and the available space evaluated by Pell and Gregory classification.

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Conflict of interest statement

The authors have declared that no competing interests exist.

Figures

Fig 1
Fig 1. The angle formed by the tooth axis of the mandibular second molar and that of the mandibular third molar in a sagittal slice (the white arrow).
Fig 2
Fig 2. The bone thickness of the right mandible (1) and the bone thickness on the lingual side of the mandibular third molar (2) in the apical region in a coronal slice.
Fig 3
Fig 3. A case with “perforation” (with the white arrow indicating the root of mandibular third molar).
Fig 4
Fig 4. The comparison between patients with “perforation” and without “perforation” (*P < 0.05, Mann-Whitney’s U-test).
See this image and copyright information in PMC

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