Anatomical relationship between the mandibular foramen and the lateral surface shape of the mandibular ramus using CT

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Objective: The antilingular prominence (AP) is a well-known landmark used during planning of intraoral vertical ramus osteotomy (IVRO) in order to prevent inferior alveolar nerve (IAN) injury, but the location of this landmark is not always clear. In this study, we analyzed the anatomical relationship between the mandibular foramen (MF) and the lateral surface shape of the mandibular ramus for use during IVRO. Patients and methods: We retrospectively analyzed 276 mandibular halves in 67 patients with mandibular deformity and 71 patients without deformity imaged at our department from April 2003 to March 2014. We defined 17 points on the mandibular ramus, and examined the anatomical relationships using multi-planar reconstruction (MPR) images and three-dimensional computed tomography (3DCT) created from preoperative CT data. Results: The prevalence of the AP was 57.6% (159/276) of all cases. The MF was located inferior to the AP in all cases; it was posterior to the AP in 50.3% (80/159) of cases and the sigmoid notch (SN) in 24.6% (68/276) of cases. The minimum horizontal distance between the mandibular posterior ramus border and the MF was 9.28. mm in all cases. Conclusion: The AP cannot always serve as a reference point to prevent IAN damage during IVRO. The osteotomy incision should be placed within 9. mm of the posterior mandibular ramus border in order to prevent intraoperative IAN damage. However, preoperative review of planned osteotomy incisions is necessary in every case.

Original languageEnglish
Pages (from-to)614-623
Number of pages10
JournalJournal of Oral and Maxillofacial Surgery, Medicine, and Pathology
Volume27
Issue number5
DOIs
Publication statusPublished - Sep 1 2015

Fingerprint

Osteotomy
Mandibular Nerve
Three-Dimensional Imaging
Sigmoid Colon
Tomography
Wounds and Injuries

Keywords

  • Antilingular prominence
  • Computed tomography
  • Intraoral vertical ramus osteotomy
  • Mandibular foramen
  • Three-dimensional analysis

ASJC Scopus subject areas

  • Otorhinolaryngology
  • Pathology and Forensic Medicine
  • Surgery
  • Oral Surgery

Cite this

@article{1170da495f8d430983eb03d01b8714a4,
title = "Anatomical relationship between the mandibular foramen and the lateral surface shape of the mandibular ramus using CT",
abstract = "Objective: The antilingular prominence (AP) is a well-known landmark used during planning of intraoral vertical ramus osteotomy (IVRO) in order to prevent inferior alveolar nerve (IAN) injury, but the location of this landmark is not always clear. In this study, we analyzed the anatomical relationship between the mandibular foramen (MF) and the lateral surface shape of the mandibular ramus for use during IVRO. Patients and methods: We retrospectively analyzed 276 mandibular halves in 67 patients with mandibular deformity and 71 patients without deformity imaged at our department from April 2003 to March 2014. We defined 17 points on the mandibular ramus, and examined the anatomical relationships using multi-planar reconstruction (MPR) images and three-dimensional computed tomography (3DCT) created from preoperative CT data. Results: The prevalence of the AP was 57.6{\%} (159/276) of all cases. The MF was located inferior to the AP in all cases; it was posterior to the AP in 50.3{\%} (80/159) of cases and the sigmoid notch (SN) in 24.6{\%} (68/276) of cases. The minimum horizontal distance between the mandibular posterior ramus border and the MF was 9.28. mm in all cases. Conclusion: The AP cannot always serve as a reference point to prevent IAN damage during IVRO. The osteotomy incision should be placed within 9. mm of the posterior mandibular ramus border in order to prevent intraoperative IAN damage. However, preoperative review of planned osteotomy incisions is necessary in every case.",
keywords = "Antilingular prominence, Computed tomography, Intraoral vertical ramus osteotomy, Mandibular foramen, Three-dimensional analysis",
author = "Yu Goda and Tatsushi Matsumura and Yoshinobu Yanagi and Norifumi Moritani and Seiji Iida",
year = "2015",
month = "9",
day = "1",
doi = "10.1016/j.ajoms.2014.11.007",
language = "English",
volume = "27",
pages = "614--623",
journal = "Journal of Oral and Maxillofacial Surgery, Medicine, and Pathology",
issn = "2212-5558",
publisher = "Elsevier Limited",
number = "5",

}

TY - JOUR

T1 - Anatomical relationship between the mandibular foramen and the lateral surface shape of the mandibular ramus using CT

AU - Goda, Yu

AU - Matsumura, Tatsushi

AU - Yanagi, Yoshinobu

AU - Moritani, Norifumi

AU - Iida, Seiji

PY - 2015/9/1

Y1 - 2015/9/1

N2 - Objective: The antilingular prominence (AP) is a well-known landmark used during planning of intraoral vertical ramus osteotomy (IVRO) in order to prevent inferior alveolar nerve (IAN) injury, but the location of this landmark is not always clear. In this study, we analyzed the anatomical relationship between the mandibular foramen (MF) and the lateral surface shape of the mandibular ramus for use during IVRO. Patients and methods: We retrospectively analyzed 276 mandibular halves in 67 patients with mandibular deformity and 71 patients without deformity imaged at our department from April 2003 to March 2014. We defined 17 points on the mandibular ramus, and examined the anatomical relationships using multi-planar reconstruction (MPR) images and three-dimensional computed tomography (3DCT) created from preoperative CT data. Results: The prevalence of the AP was 57.6% (159/276) of all cases. The MF was located inferior to the AP in all cases; it was posterior to the AP in 50.3% (80/159) of cases and the sigmoid notch (SN) in 24.6% (68/276) of cases. The minimum horizontal distance between the mandibular posterior ramus border and the MF was 9.28. mm in all cases. Conclusion: The AP cannot always serve as a reference point to prevent IAN damage during IVRO. The osteotomy incision should be placed within 9. mm of the posterior mandibular ramus border in order to prevent intraoperative IAN damage. However, preoperative review of planned osteotomy incisions is necessary in every case.

AB - Objective: The antilingular prominence (AP) is a well-known landmark used during planning of intraoral vertical ramus osteotomy (IVRO) in order to prevent inferior alveolar nerve (IAN) injury, but the location of this landmark is not always clear. In this study, we analyzed the anatomical relationship between the mandibular foramen (MF) and the lateral surface shape of the mandibular ramus for use during IVRO. Patients and methods: We retrospectively analyzed 276 mandibular halves in 67 patients with mandibular deformity and 71 patients without deformity imaged at our department from April 2003 to March 2014. We defined 17 points on the mandibular ramus, and examined the anatomical relationships using multi-planar reconstruction (MPR) images and three-dimensional computed tomography (3DCT) created from preoperative CT data. Results: The prevalence of the AP was 57.6% (159/276) of all cases. The MF was located inferior to the AP in all cases; it was posterior to the AP in 50.3% (80/159) of cases and the sigmoid notch (SN) in 24.6% (68/276) of cases. The minimum horizontal distance between the mandibular posterior ramus border and the MF was 9.28. mm in all cases. Conclusion: The AP cannot always serve as a reference point to prevent IAN damage during IVRO. The osteotomy incision should be placed within 9. mm of the posterior mandibular ramus border in order to prevent intraoperative IAN damage. However, preoperative review of planned osteotomy incisions is necessary in every case.

KW - Antilingular prominence

KW - Computed tomography

KW - Intraoral vertical ramus osteotomy

KW - Mandibular foramen

KW - Three-dimensional analysis

UR - http://www.scopus.com/inward/record.url?scp=84940609309&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84940609309&partnerID=8YFLogxK

U2 - 10.1016/j.ajoms.2014.11.007

DO - 10.1016/j.ajoms.2014.11.007

M3 - Article

AN - SCOPUS:84940609309

VL - 27

SP - 614

EP - 623

JO - Journal of Oral and Maxillofacial Surgery, Medicine, and Pathology

JF - Journal of Oral and Maxillofacial Surgery, Medicine, and Pathology

SN - 2212-5558

IS - 5

ER -