J Korean Assoc Maxillofac Plast Reconstr Surg.
2008 Mar;30(2):165-171.
Inferior alveolar nerve injury following removal of mandibular third molar and panoramic radiological risk sign
- Affiliations
-
- 1Department of Oral and Maxillofacial Surgery, Graduate School of Clinical Dental Science, The Catholic University of Korea, Korea.
- 2Department of Oral and Maxillofacial Surgery, Samsung Medical Center, Sungkyunkwan University, Korea.
- 3Department of Oral and Maxillofacial Surgery, College of Medicine, The Catholic University of Korea, Korea. spyo@catholic.ac.kr
Abstract
- The aim of this study was to evaluate the incidence of panoramic raiological risk signs related with mandibular third molar extraction, and the relationship between these risk signs and inferior alveolar nerve(IAN) injury after tooth extraction. Cases were defined as 1000 mandibular third molars extracted by surgical approach at Samsung Medical Center during the period from March 2001 to December 2006. Seven radiological risk signs were assessed on the panoramic radiogram by three expert oral surgeons. Clinical demographic data and severity of IAN injury were examined on medical records. Bivariate analyses were completed to assess the relationship between radiological risk signs and IAN injury. The radiological risk signs showed in 381 cases(38.1%). The incidence of each radiological risk signs were: interruption of IAN white line, 152 cases(15.2%); deflected roots, 141 cases(14.1%); darkening root, 119 cases(11.9%); diversion of IAN, 57 cases(5.7%) ; IAN narrowing, 37 cases(3.7%); root narrowing, 17 cases(1.7%); dark and bifid apex, 10 cases(1.0%). The incidence of IAN injury in cases with risk signs were: in the case of any sign, 3.6%; interruption of IAN white line, 2.6%; deflected roots 5.7%; darkening root, 3.4%; diversion of IAN, 5.7%; IAN narrowing, 3.7%; root narrowing, 5.9%; dark and bifid apex, 0%. No IAN injury was showed in 619 cases without risk sign (P<0.05). In conclusion, the presence of panoramic risk signs was associated with an increased risk for IAN injury during mandibular third molar extraction, whereas the absence of risk signs was associated with a minimal risk of nerve injury.
- Full Text Links
-
- Actions
-
Cited
- CITED
-
- Close
- Share
-
- Similar articles
-
- The study of evaluation to relationship between the inferior alveolar nerve and the mandibular third molar by using radiographic image
- Comparison of panoramic radiography with cone beam CT in predicting the relationship of the mandibular third molar roots to the alveolar canal
- Radiographic evaluation of the course and visibility of the mandibular canal
- Diversion of the mandibular canal: Is it the best predictor of inferior alveolar nerve damage during mandibular third molar surgery on panoramic radiographs?
- Assessment of the relationship between the mandibular third molar and the mandibular canal using panoramic radiograph and cone beam computed tomography
