Abstract
Purpose
This study was aimed to detect the positions of mental canal and incisive nerve canal as well as the prolongation of mandibular canal in interforaminal region in Chinese population to supply the reference data of the surgical safe zone in chin for clinicians.
Materials and methods
A total of 80 formalin-fixed semi-mandibles of Chinese adult cadavers were dissected, the positions and courses of mental canal and incisive nerve canal as well as the prolongation of mandibular canal in interforaminal region were measured.
Results
The mental foramina were present in all cases (100 %), and most of them were located below 2nd premolar (58.75 %). Accessory mental foramina were observed in 5 %. The anterior end of mandibular canal, extending along the course of 7.37 ± 1.10 mm above the lower border of mandible to interforaminal region about 3.54 ± 0.70 mm medial to the mental foramen, most often ended below between the two premolars (73.75 %), where it continued as the incisive nerve canal (100 %) and the mental canal (96.25 %). Mental canal, with the wall formed by compact bone, being 2.60 ± 0.60 mm in diameter and 4.01 ± 1.20 mm in length, opened into mental foramen. Incisive nerve canal, with the wall formed by thin compact bone and/or partly or completely by spongy bone, being 1.76 ± 0.27 mm in diameter and 24.87 ± 2.23 mm in length, extended to the incisor region along the course of 9.53 ± 1.43 mm above the lower border of mandible, and most often ended below the lateral incisor (70.00 %).
Conclusion
This research recommended for chin operations in Chinese population: the surgical safe zone could be set in the region about over 4 mm anterior to the mental foramen, and over 12 mm above inferior border of mandible for anterior alveolar surgery, or within 9 mm above inferior border of mandible for genioplasty.
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References
Al-Ani O, Nambiar P, Ha KO, Ngeow WC (2013) Safe zone for bone harvesting from the interforaminal region of the mandible. Clin Oral Implants Res 24(Suppl A):115–121
Apostolakis D, Brown JE (2012) The anterior loop of the inferior alveolar nerve: prevalence, measurement of its length and a recommendation for interforaminal implant installation based on cone beam CT imaging. Clin Oral Implants Res 23(9):1022–1030
Chen JC, Lin LM, Geist JR, Chen JY, Chen CH, Chen YK (2013) A retrospective comparison of the location and diameter of the inferior alveolar canal at the mental foramen and length of the anterior loop between American and Taiwanese cohorts using CBCT. Surg Radiol Anat 35(1):11–18
de Freitas V, Madeira MC, Toledo Filho JL, Chagas CF (1979) Absence of the mental foramen in dry human mandibles. Acta Anat (Basel) 104(3):353–355
Green RM (1987) The position of the mental foramen: a comparison between the southern (Hong Kong) Chinese and other ethnic and racial groups. Oral Surg Oral Med Oral Pathol 63(3):287–290
Guo JL, Su L, Zhao JL, Yang L, Lv DL, Li YQ, Cheng FB (2009) Location of mental foramen based on soft- and hard-tissue landmarks in a Chinese population. J Craniofac Surg 20(6):2235–2237
Hasan T (2013) Bilateral caroticoclinoid and absent mental foramen: rare variations of cranial base and lower jaw. Ital J Anat Embryol 118(3):288–297
Huang H, Liu P, Li X, Pei Z, Yang X, Bai S, Huang Y (2013) Mandibular incisive canal by cone beam CT. Hua Xi Kou Qiang Yi Xue Za Zh 31(5):479–482
Hunt DR, Jovanovic SA (1999) Autogenous bone harvesting: a chin graft technique for particulate and monocortical bone blocks. Int J Periodontics Restorative Dent 19(2):165–173
Hu KS, Yun HS, Hur MS, Kwon HJ, Abe S, Kim HJ (2007) Branching patterns and intraosseous course of the mental nerve. J Oral Maxillofac Surg 65(11):2228–2294
Kamburoğlu K, Kiliç C, Ozen T, Yüksel SP (2009) Measurements of mandibular canal region obtained by cone-beam computed tomography: a cadaveric study. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 107(2):e34–e42
Kim TS, Caruso JM, Christensen H, Torabinejad M (2010) A comparison of cone-beam computed tomography and direct measurement in the examination of the mandibular canal and adjacent structures. J Endod 36(7):1191–1194
Krasny A, Krasny N, Prescher A (2012) Anatomic variations of neural canal structures of the mandible observed by 3-tesla magnetic resonance imaging. J Comput Assist Tomogr 36(1):150–153
Kuzmanovic DV, Payne AG, Kieser JA, Dias GJ (2003) Anterior loop of the mental nerve: a morphological and radiographic study. Clin Oral Implants Res 14(4):464–471
Mardinger O, Chaushu G, Arensburg B, Taicher S, Kaffe I (2000) Anatomic and radiologic course of the mandibular incisive canal. Surg Radiol Anat 22(3–4):157–161
Mraiwa N, Jacobs R, Moerman P, Lambrichts I, van Steenberghe D, Quirynen M (2003) Presence and course of the incisive canal in the human mandibular interforaminal region: two-dimensional imaging versus anatomical observations. Surg Radiol Anat 25(5–6):416–423
Ousterhout DK (1996) Sliding genioplasty, avoiding mental nerve injuries. J Craniofac Surg 7(4):297–298
Pommer B, Tepper G, Gahleitner A, Zechner W, Watzek G (2008) New safety margins for chin bone harvesting based on the course of the mandibular incisive canal in CT. Clin Oral Implants Res 19(12):1312–1316
Rosa MB, Sotto-Maior BS, Machado Vde C, Francischone CE (2013) Retrospective study of the anterior loop of the inferior alveolar nerve and the incisive canal using cone beam computed tomography. Int J Oral Maxillofac Implants 28(2):388–392
Santini A, Alayan I (2012) A comparative anthropometric study of the position of the mental foramen in three populations. Br Dent J 212(4):E7
Santini A, Land M (1990) A comparison of the position of the mental foramen in Chinese and British mandibles. Acta Anat (Basel) 137(3):208–212
Sawyer DR, Kiely ML, Pyle MA (1998) The frequency of accessory mental foramina in four ethnic groups. Arch Oral Biol 43(5):417–420
Uchida Y, Yamashita Y, Goto M, Hanihara T (2007) Measurement of anterior loop length for the mandibular canal and diameter of the mandibular incisive canal to avoid nerve damage when installing endosseous implants in the interforaminal region. J Oral Maxillofac Surg 65(9):1772–1779
Wang TM, Shih C, Liu JC, Kuo KJ (1986) A clinical and anatomical study of the location of the mental foramen in adult Chinese mandibles. Acta Anat (Basel) 126(1):29–33
Acknowledgments
The project was supported by the Scientific Research Foundation (Number: JY2013KJ014) of Jining Medical University.
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The authors declare that they have no conflict of interest.
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Y. Xu and N. Suo contributed equally to this work.
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Xu, Y., Suo, N., Tian, X. et al. Anatomic study on mental canal and incisive nerve canal in interforaminal region in Chinese population. Surg Radiol Anat 37, 585–589 (2015). https://doi.org/10.1007/s00276-014-1402-7
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DOI: https://doi.org/10.1007/s00276-014-1402-7