Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2019 Jun;18(2):307-313.
doi: 10.1007/s12663-018-1151-y. Epub 2018 Sep 19.

Nerve Injury After Surgical Excision of Mandibular Third Molars Under Local Anesthesia: An Audit

Ashok Ramadorai  1 , Andrew B G Tay  2 , Gayathri Vasanthakumar  3 , W K Lye  4
Affiliations

Nerve Injury After Surgical Excision of Mandibular Third Molars Under Local Anesthesia: An Audit

Ashok Ramadorai et al. J Maxillofac Oral Surg. 2019 Jun.

Abstract

Background: Injury of the inferior alveolar nerve (IAN) sustained during surgical removal of an impacted lower third molar may cause paresthesia of the lower lip, chin, lower gingivae and anterior teeth. Lingual nerve (LN) injuries may result in ipsilateral paresthesia of the anterior two thirds of the tongue, mucosa of floor of mouth and lingual gingivae. A close anatomic relationship between the roots of the third molar and mandibular canal places the IAN at risk of damage.

Purpose: The primary aim of this retrospective audit was to ascertain the incidence of IAN and LN damage after mandibular third molar surgery in National Dental Centre Singapore. A secondary aim was to identify the contributory factors for the risk of IAN and LN nerve injury on the basis of the data collected.

Methods: This retrospective audit included 1276 mandibular third molar surgical removals performed in the local anesthesia operating theatre (LAOT) at the National Dental Centre Singapore (NDCS) from April to December 2013. Data included patient details, clinical characteristics, and 1 week postoperative presence/absence of sensory alteration as reported by the patient.

Results: Summary of results- Out of 1276 third molar sites audited, 8 (0.62%) sites had altered sensation of the IAN and 1 (0.078%) had altered sensation of the LN at 1 week postoperative review.

Conclusion: The incidence of IAN injury (0.62%) and lingual Nerve injury (0.08%) after one week from surgery in our audit was low compared to similar studies. This retrospective audit did not show any correlation of nerve injury to age, gender, race, site, angulation of tooth, grade of operator, removal of bone or tooth division. There was no single radiological sign associated with paresthesia, although the most common radiological signs were interruption of the canal line and darkening of the roots.

Keywords: Altered sensation; Inferior alveolar nerve; Lingual nerve; Third molar.

PubMed Disclaimer

Figures

Fig. 1
Fig. 1
Distribution of OPG mandibular canal and root
Fig. 2
Fig. 2
Type of impaction by race (number in middle of the bar is count for each category)
See this image and copyright information in PMC

References

    1. Osborn TP, Frederickson G, Small IA, Torgerson TS. A prospective study of complications related to mandibular third molar surgery. J Oral Maxillofac Surg. 1985;43:767–769. doi: 10.1016/0278-2391(85)90331-3. - DOI - PubMed
    1. Wofford DT, Miller RI. Prospective study of dysesthesia following odontectomy of impacted mandibular third molars. J Oral Maxillofac Surg. 1987;45:15–19. doi: 10.1016/0278-2391(87)90080-2. - DOI - PubMed
    1. Rood JP. Permanent damage to inferior alveolar and lingual nerves during the removal of impacted mandibular third molars. Comparison of two methods of bone removal. Br Dent J. 1992;172:108–110. doi: 10.1038/sj.bdj.4807777. - DOI - PubMed
    1. Carmichael FA, McGowan DA. Incidence of nerve damage following third molar removal: a West of Scotland Oral Surgery Research Group Study. Br J Oral Maxillofac Surg. 1992;30:78–82. doi: 10.1016/0266-4356(92)90074-S. - DOI - PubMed
    1. Schultze-Mosgau S, Reich RH. Assessment of inferior alveolar and lingual nerve disturbances after dentoalveolar surgery, and of recovery of sensitivity. Int J Oral Maxillofac Surg. 1993;22:214–217. doi: 10.1016/S0901-5027(05)80638-1. - DOI - PubMed

LinkOut - more resources