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Erschienen in: Oral Radiology 4/2020

15.11.2019 | Original Article

Observation of retromolar canals on cone beam computed tomography

verfasst von: Yunwen Hou, Guanying Feng, Wen Lin, Ruixia Wang, Hua Yuan

Erschienen in: Oral Radiology | Ausgabe 4/2020

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Abstract

Objective

To evaluate the incidence and location of retromolar canal (RMC) in an eastern Chinese population using cone beam computed tomography (CBCT) images.

Methods

Six hundred and fifty-seven patients (276 males and 381 females, 19–49 years old) from east China were enrolled. Both right and left sides of the mandible were examined (n = 1314). Two-dimensional (2D) images of various planes in the mandibular ramus region and reconstructed three-dimensional (3D) images were reviewed. The course of the RMC and the location of the retromolar foramina (RMF) were observed.

Results

Retromolar canal (RMC) was observed in 25.9% (170/657) of patients and 15.7% of sides (206/1314). 20.4% patients had unilateral RMC (134/657) and 5.5% had bilaterally RMC (36/657). Most RMC are horizontally curved course (Type B, 45.6%), followed by vertically curved course (Type A, 44.2%). Type C RMC, which run independently from separate foramina in the mandibular ramus, were relatively rare (10.2%). The distance from the middle of the RMF to the distal end of the second molar ranged from 4.56 to 24.01 mm and the mean distance was 11.97 mm.

Conclusion

RMC is not a rare anatomical structure in the eastern Chinese population. CBCT should be applied as a diagnostic tool to provide detailed information involving the retromolar area.
Literatur
1.
Zurück zum Zitat Alves N, Deana NF. Anatomical and radiographical study of the retromolar canal and retromolar foramen in macerated mandibles. Int J Clin Exp Med. 2015;8(3):4292–6.PubMedPubMedCentral Alves N, Deana NF. Anatomical and radiographical study of the retromolar canal and retromolar foramen in macerated mandibles. Int J Clin Exp Med. 2015;8(3):4292–6.PubMedPubMedCentral
2.
Zurück zum Zitat Naitoh M, Hiraiwa Y, Aimiya H, Ariji E. Observation of bifid mandibular canal using cone-beam computerized tomography. Int J Oral Max Implant. 2009;24(1):155–9. Naitoh M, Hiraiwa Y, Aimiya H, Ariji E. Observation of bifid mandibular canal using cone-beam computerized tomography. Int J Oral Max Implant. 2009;24(1):155–9.
3.
Zurück zum Zitat Chavez-Lomeli M, Mansilla Lory J, Pompa J, Kjaer I. The human mandibular canal arises from three separate canals innervating different tooth groups. J Dent Res. 1996;75(8):1540–4.PubMedCrossRef Chavez-Lomeli M, Mansilla Lory J, Pompa J, Kjaer I. The human mandibular canal arises from three separate canals innervating different tooth groups. J Dent Res. 1996;75(8):1540–4.PubMedCrossRef
4.
Zurück zum Zitat Kuribayashi A, Watanabe H, Imaizumi A, Tantanapornkul W, Katakami K, Kurabayashi T. Bifid mandibular canals: cone beam computed tomography evaluation. Dentomaxillofacial Radiol. 2010;39(4):235–9.CrossRef Kuribayashi A, Watanabe H, Imaizumi A, Tantanapornkul W, Katakami K, Kurabayashi T. Bifid mandibular canals: cone beam computed tomography evaluation. Dentomaxillofacial Radiol. 2010;39(4):235–9.CrossRef
5.
Zurück zum Zitat Naitoh M, Nakahara K, Suenaga Y, Gotoh K, Kondo S, Ariji E. variations of the bony canal in the mandibular ramus using cone-beam computed tomography. Oral Radiol. 2010;26(1):36–40.CrossRef Naitoh M, Nakahara K, Suenaga Y, Gotoh K, Kondo S, Ariji E. variations of the bony canal in the mandibular ramus using cone-beam computed tomography. Oral Radiol. 2010;26(1):36–40.CrossRef
6.
Zurück zum Zitat Kong N, Hui M, Miao F, Yuan H, Du Y, Chen N. Mandibular incisive canal in han chinese using cone beam computed tomography. Int J Oral Max Surg. 2016;45(9):1142–6.CrossRef Kong N, Hui M, Miao F, Yuan H, Du Y, Chen N. Mandibular incisive canal in han chinese using cone beam computed tomography. Int J Oral Max Surg. 2016;45(9):1142–6.CrossRef
7.
Zurück zum Zitat Han S, Hwang Y. Cone beam Ct findings of retromolar canals in a korean population. Surg Radiol Anat. 2014;36(9):871–6.PubMedCrossRef Han S, Hwang Y. Cone beam Ct findings of retromolar canals in a korean population. Surg Radiol Anat. 2014;36(9):871–6.PubMedCrossRef
8.
Zurück zum Zitat Kawai T, Asaumi R, Sato I, Kumazawa Y, Yosue T. Observation of the retromolar foramen and canal of the mandible: a Cbct and macroscopic study. Oral Radiol. 2012;28(1):10–4.CrossRef Kawai T, Asaumi R, Sato I, Kumazawa Y, Yosue T. Observation of the retromolar foramen and canal of the mandible: a Cbct and macroscopic study. Oral Radiol. 2012;28(1):10–4.CrossRef
9.
Zurück zum Zitat Lizio G, Pelliccioni GA, Ghigi G, Fanelli A, Marchetti C. Radiographic assessment of the mandibular retromolar canal using cone-beam computed tomography. Acta Odontol Scand. 2013;71(3–4):650–5.PubMedCrossRef Lizio G, Pelliccioni GA, Ghigi G, Fanelli A, Marchetti C. Radiographic assessment of the mandibular retromolar canal using cone-beam computed tomography. Acta Odontol Scand. 2013;71(3–4):650–5.PubMedCrossRef
10.
Zurück zum Zitat Von Arx T, Hänni A, Sendi P, Buser D, Bornstein MM. Radiographic study of the mandibular retromolar canal: an anatomic structure with clinical importance. J Endod. 2011;37(12):1630–5.CrossRef Von Arx T, Hänni A, Sendi P, Buser D, Bornstein MM. Radiographic study of the mandibular retromolar canal: an anatomic structure with clinical importance. J Endod. 2011;37(12):1630–5.CrossRef
11.
Zurück zum Zitat Ossenberg NS. Retromolar foramen of the human mandible. Am J Phys Anthropol. 1987;73(1):119–28.PubMedCrossRef Ossenberg NS. Retromolar foramen of the human mandible. Am J Phys Anthropol. 1987;73(1):119–28.PubMedCrossRef
12.
Zurück zum Zitat Schejtman R, Devoto FC, Arias NH. The origin and distribution of the elements of the human mandibular retromolar canal. Arch Oral Biol. 1967;12(11):1261–8.PubMedCrossRef Schejtman R, Devoto FC, Arias NH. The origin and distribution of the elements of the human mandibular retromolar canal. Arch Oral Biol. 1967;12(11):1261–8.PubMedCrossRef
13.
Zurück zum Zitat Patil S, Matsuda Y, Nakajima K, Araki K, Okano T. Retromolar canals as observed on cone-beam computed tomography: their incidence, course, and characteristics. Oral Surg Oral Med Oral Pathol Oral Radiol. 2013;115(5):692–9.PubMedCrossRef Patil S, Matsuda Y, Nakajima K, Araki K, Okano T. Retromolar canals as observed on cone-beam computed tomography: their incidence, course, and characteristics. Oral Surg Oral Med Oral Pathol Oral Radiol. 2013;115(5):692–9.PubMedCrossRef
14.
Zurück zum Zitat Athavale S, Vijaywargia M, Deopujari R, Kotgirwar S. Bony and cadaveric study of retromolar region. People’s J Sci Res. 2013;6(2):14–8. Athavale S, Vijaywargia M, Deopujari R, Kotgirwar S. Bony and cadaveric study of retromolar region. People’s J Sci Res. 2013;6(2):14–8.
15.
Zurück zum Zitat Galdámes IS, Matamala DZ, López MC, Suazo G, Zavando M, Cantín L. Retromolar canal and forame prevalence in dried mandibles and clinical implications. Int J Odontostomatol. 2008;2(2):183–7. Galdámes IS, Matamala DZ, López MC, Suazo G, Zavando M, Cantín L. Retromolar canal and forame prevalence in dried mandibles and clinical implications. Int J Odontostomatol. 2008;2(2):183–7.
16.
Zurück zum Zitat Motamedi MH, Gharedaghi J, Mehralizadeh S, Navi F, Badkoobeh A, Valaei N, et al. Anthropomorphic assessment of the retromolar foramen and retromolar nerve: anomaly or variation of normal anatomy? Int J Oral Maxillofacial Surg. 2016;45(2):241–4.CrossRef Motamedi MH, Gharedaghi J, Mehralizadeh S, Navi F, Badkoobeh A, Valaei N, et al. Anthropomorphic assessment of the retromolar foramen and retromolar nerve: anomaly or variation of normal anatomy? Int J Oral Maxillofacial Surg. 2016;45(2):241–4.CrossRef
17.
Zurück zum Zitat Sisman Y, Ercan-Sekerci A, Payveren-Arıkan M, Sahman H. Diagnostic accuracy of cone-beam ct compared with panoramic images in predicting retromolar canal during extraction of impacted mandibular third molars. Med Oral Patol Oral Cir Bucal. 2015;20(1):e74–e81.PubMedCrossRef Sisman Y, Ercan-Sekerci A, Payveren-Arıkan M, Sahman H. Diagnostic accuracy of cone-beam ct compared with panoramic images in predicting retromolar canal during extraction of impacted mandibular third molars. Med Oral Patol Oral Cir Bucal. 2015;20(1):e74–e81.PubMedCrossRef
18.
Zurück zum Zitat Hepburn D. Some variations in the arrangements of the nerves of the human body. J Anat Physiol. 1887;21(part 3):511–3.PubMedPubMedCentral Hepburn D. Some variations in the arrangements of the nerves of the human body. J Anat Physiol. 1887;21(part 3):511–3.PubMedPubMedCentral
19.
Zurück zum Zitat Kawai T, Asaumi R, Kumazawa Y, Sato I, Yosue T. Observation of the temporal crest canal in the mandibular ramus by cone beam computed tomography and macroscopic study. Int J Comput Ass Radiol Surg. 2014;9(2):295–9.CrossRef Kawai T, Asaumi R, Kumazawa Y, Sato I, Yosue T. Observation of the temporal crest canal in the mandibular ramus by cone beam computed tomography and macroscopic study. Int J Comput Ass Radiol Surg. 2014;9(2):295–9.CrossRef
20.
Zurück zum Zitat Ossenberg N. Temporal crest canal: case report and statistics on a rare mandibular variant. Oral Surg Oral Med Oral Pathol. 1986;62(1):10–2.PubMedCrossRef Ossenberg N. Temporal crest canal: case report and statistics on a rare mandibular variant. Oral Surg Oral Med Oral Pathol. 1986;62(1):10–2.PubMedCrossRef
21.
Zurück zum Zitat Kikuta S, Iwanaga J, Nakamura K, Hino K, Nakamura M, Kusukawa J. The retromolar canals and foramina: radiographic observation and application to oral surgery. Surg Radiol Anat. 2018;40(6):647–52.PubMedCrossRef Kikuta S, Iwanaga J, Nakamura K, Hino K, Nakamura M, Kusukawa J. The retromolar canals and foramina: radiographic observation and application to oral surgery. Surg Radiol Anat. 2018;40(6):647–52.PubMedCrossRef
22.
Zurück zum Zitat Sawyer DR, Kiely ML. Retromolar foramen: a mandibular variant important to dentistry. J Ann Dent. 1991;50(1):16–8. Sawyer DR, Kiely ML. Retromolar foramen: a mandibular variant important to dentistry. J Ann Dent. 1991;50(1):16–8.
Metadaten
Titel
Observation of retromolar canals on cone beam computed tomography
verfasst von
Yunwen Hou
Guanying Feng
Wen Lin
Ruixia Wang
Hua Yuan
Publikationsdatum
15.11.2019
Verlag
Springer Singapore
Erschienen in
Oral Radiology / Ausgabe 4/2020
Print ISSN: 0911-6028
Elektronische ISSN: 1613-9674
DOI
https://doi.org/10.1007/s11282-019-00414-0

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