Preoperative Anatomic Evaluation of the Relationship Between Inferior Alveolar Nerve Canal and Impacted Mandibular Third Molar in a Population of Bhubaneswar, Odisha, Using CBCT: A Hospital-Based Study

  • Rajat Mohanty
  • Purnendu Rout
  • Vaibhav SinghEmail author
Original Article



To evaluate the correlation between the position of inferior alveolar nerve canal and the angulation of impacted mandibular third molars using cone beam computed tomography (CBCT) in a hospital-based study in the state of Odisha, India.

Materials and Methodology

Three hundred cases of impacted third molars in 200 patients (154 males; 46 females) were included in the study, for whom an initial periapical or panoramic radiograph had revealed that the mandibular canal and the lower third molars were in close proximity. A CBCT scan of each patient was carried out to assess how the canal position influenced the class and position of impaction, angulation of impaction and bone contact.


Class II position B impactions were found in 78.37% cases where the position of ID canal was approximate to the lingual plate and inferior to third molar (73.75%). The results were statistically significant (p = 0.00). 80% of the ID canals showed bone contact. Of these 73.75% ID canals showed lingual bone contact. Mesioangular impactions were most common in mandible and significantly associated with lingual and inferior positioning of the canal.


The study mostly exhibited patients having mesioangular class II position B third molar impactions of the mandible. The position of the canal has a significant influence on the type of impaction and the bone contact.


Inferior alveolar nerve canal Impactions Third molars CBCT 



The study was supported by Department of Oral Medicine and Radiology, Kalinga Institute of Dental Sciences, KIIT University, Bhubaneswar, India.

Compliance with Ethical Standards

Conflict of interest

All authors declare that they have no conflict of interest.


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Copyright information

© The Association of Oral and Maxillofacial Surgeons of India 2019

Authors and Affiliations

  1. 1.Department of Oral and Maxillofacial SurgeryKalinga Institute of Dental SciencesBhubaneswarIndia
  2. 2.Department of Oral Medicine and RadiologyKalinga Institute of Dental SciencesBhubaneswarIndia
  3. 3.Narayana Superspeciality HospitalKolkataIndia

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