Mandibulan canalist variations on lower third molar impaction jaw with the panoramic radiography


Background: The third molars of the lower mandibular are the most teeth with impaction because of to lack of eruption site. The canal of mandibular variations in impacted mandibular third molars are associated with a risk of injury be increased to the inferior alveolar nerve at the time of extraction. Radiography of panoramic is the most commonly used radiographic technique to see variations in the location of impacted third molars of mandibular and their relationship to the mandibular canal.  It is done to estimate the risk of inferior alveolar nerve injury.
Objective: To determine the distribution of mandibular canal variations on impacted mandibular third molars with panoramic radiographs.
Methods: Study method consist of 60 samples used panoramic radiographic. The sample observers by on the Rood & Shehab classification. To analyze the data of this study using the Friedman test.
Results: The highest distribution of the first distribution was owned by the interruption of the third molar root by 77%, the second was owned by darkening of the root of the third molar by 11%, the third was owned by the narrowing of the of the root of third molar by 6%, and the canal of mandibular diversion was 6%.
Conclusion: The highest distribution of canal interruption of mandibular, followed by darkening of the third molar root of impacted, then narrowing of the third molar root and diversion the canal of mandibular.


  • Bayat, M., & Teymoorian, A. (2015). A Study on Gravimeteric Situation in East of Uromieh Lake Region with Determination of Suitable Bouguer Density. International Journal of Geography and Geology, 4(9), 146-154.
  • Flanagan, D. (2012). Forced extrusion for removal of impacted third molars close to the mandibular canal. Revista Española de Cirugía Oral y Maxilofacial, 34(1), 25-30.
  • Gomes, A. C. A., do Egito Vasconcelos, B. C., de Oliveira Silva, E. D., de França Caldas Jr, A., & Neto, I. C. P. (2008). Sensitivity and specificity of pantomography to predict inferior alveolar nerve damage during extraction of impacted lower third molars. Journal of oral and maxillofacial surgery, 66(2), 256-259.
  • Gu, L., Zhu, C., Chen, K., Liu, X., & Tang, Z. (2018). Anatomic study of the position of the mandibular canal and corresponding mandibular third molar on cone-beam computed tomography images. Surgical and Radiologic Anatomy, 40(6), 609-614.
  • Hashemipour, M. A., Tahmasbi-Arashlow, M., & Fahimi-Hanzaei, F. (2013). Incidence of impacted mandibular and maxillary third molars: a radiographic study in a Southeast Iran population. Medicina oral, patologia oral y cirugia bucal, 18(1), e140.
  • Jerjes, W., Swinson, B., Moles, D. R., El-Maaytah, M., Banu, B., Upile, T., ... & Kumar, S. (2006). Permanent sensory nerve impairment following third molar surgery: a prospective study. Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, 102(4), e1-e7.
  • Juodzbalys, G., Wang, H. L., & Sabalys, G. (2010). Anatomy of mandibular vital structures. Part I: mandibular canal and inferior alveolar neurovascular bundle in relation with dental implantology. Journal of oral & maxillofacial research, 1(1).
  • Kaya, G. Ş., Aslan, M., Omezli, M. M., & Dayi, E. (2010). Some morphological features related to mandibular third molar impaction.
  • MacGregor, A. J. (1976). The radiological assessment of ectopic lower third molars. DDSc Thesis, University of Leeds.
  • Monaco, G., Montevecchi, M., Bonetti, G. A., Gatto, M. R. A., & Checchi, L. (2004). Reliability of panoramic radiography in evaluating the topographic relationship between the mandibular canal and impacted third molars. The Journal of the American Dental Association, 135(3), 312-318.
  • Neves, F. S., Souza, T. C., Almeida, S. M., Haiter-Neto, F., Freitas, D. Q., & Bóscolo, F. N. (2012). Correlation of panoramic radiography and cone beam CT findings in the assessment of the relationship between impacted mandibular third molars and the mandibular canal. Dentomaxillofacial radiology, 41(7), 553-557.
  • Peker, I., Sarikir, C., Alkurt, M. T., & Zor, Z. F. (2014). Panoramic radiography and cone-beam computed tomography findings in preoperative examination of impacted mandibular third molars. BMC oral health, 14(1), 71.
  • Quek, S. L., Tay, C. K., Tay, K. H., Toh, S. L., & Lim, K. C. (2003). Pattern of third molar impaction in a Singapore Chinese population: a retrospective radiographic survey. International journal of oral and maxillofacial surgery, 32(5), 548-552.
  • Rood, J. P., & Shehab, B. N. (1990). The radiological prediction of inferior alveolar nerve injury during third molar surgery. British Journal of Oral and Maxillofacial Surgery, 28(1), 20-25.
  • Sarikov, R., & Juodzbalys, G. (2014). Inferior alveolar nerve injury after mandibular third molar extraction: a literature review. Journal of oral & maxillofacial research, 5(4).
  • Sedaghatfar, M., August, M. A., & Dodson, T. B. (2005). Panoramic radiographic findings as predictors of inferior alveolar nerve exposure following third molar extraction. Journal of oral and maxillofacial surgery, 63(1), 3-7.
  • Seward, G. R. (1963). Radiology in general dental practice: VIII-Assessment of lower third molars. British Dental Journal, 115,145.
  • Szalma, J., Lempel, E., Jeges, S., & Olasz, L. (2011). Darkening of third molar roots: panoramic radiographic associations with inferior alveolar nerve exposure. Journal of oral and maxillofacial surgery, 69(6), 1544-1549.
  • Tantanapornkul, W., Okouchi, K., Fujiwara, Y., Yamashiro, M., Maruoka, Y., Ohbayashi, N., & Kurabayashi, T. (2007). A comparative study of cone-beam computed tomography and conventional panoramic radiography in assessing the topographic relationship between the mandibular canal and impacted third molars. Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, 103(2), 253-259.
  • Whaites E. 2007. Essensial Of Dental Radiograf. 4th ed. Philadelpia Elsevier. Pp 25-7, 188, 194.


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