Case report: coronectomy of an impacted and submerged second deciduous molar

Key Points

  • Informs the viability of coronectomy of deciduous teeth as a viable treatment option applicable to oral surgeons, orthodontists and GDPs.

  • Highlights importance of discussing associated risks.

  • Highlights importance of sparing the inferior dental nerve and associated litigation.


Coronectomy is a widely-accepted technique available for the treatment of impacted wisdom teeth. The fundamental principle is to prevent trauma to the inferior dental nerve (IDN). Many publications have demonstrated its positive outcomes but there is no literature available regarding coronectomy of deciduous teeth. This case report highlights the complex approach to managing a severely infraoccluded 85 in the mixed dentition of a 10-year-old female. The report demonstrates and discusses the combined orthodontic and oral surgical approach to prevent damage to the IDN and to allow space for orthodontic movement. This case demonstrates how nerve sparing techniques in the mixed dentition are achievable.

Clinical relevance statement When managing severely infraoccluded and impacted deciduous second molars, clinicians must be aware that the option of a coronectomy should be considered and may be the difference between sparing the nerve or causing permanent injury.

Objective The reader should understand that coronectomy is a suitable treatment option in managing impacted deciduous teeth.

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  1. 1

    Renton T . Update on Coronectomy A safer way to remove high risk mandibular third molars. Dent Update 2013; 40: 362–364, 366–368.

    Article  Google Scholar 

  2. 2

    Renton T . Prevention of iatrogenic inferior alveolar nerve injuries in relation to dental procedures. Dent Update 2010; 37: 350–352, 354–356, 358–36.

    Article  Google Scholar 

  3. 3

    Hatano Y, Kurita K, Kuroiwa Y, Yuasa H, Ariji E . Clinical evaluations of coronectomy (intentional partial odontectomy) for mandibular third molars using dental computed tomography: a case-control study. J Oral Maxillofac Surg 2009; 67: 1806–1814.

    Article  Google Scholar 

  4. 4

    Cuminetti F, Boutin F, Frapier L . Predictive factors for resorption of teeth adjacent to impacted maxillary canines. J Int Orthod 2017; 15: 54–68.

    Google Scholar 

  5. 5

    Pereira I F, Santiago F Z M, Sette-Dias A C, Noronha V R A S . Taking advantage of an unerupted third molar: a case report. Dent Press J Orthod 2017; 22: 97–101.

    Article  Google Scholar 

  6. 6

    Guarnieri R, Cavallini C, Vernucci R, Vichi M, Leonardi R, Barbato E . Impacted maxillary canines and root resorption of adjacent teeth: A retrospective observational study. Med Oral Patol Oral Cir Bucal 2016; 21: e743–e750.

    PubMed  PubMed Central  Google Scholar 

  7. 7

    Nahhas R W, Valiathan M, Sherwood R J . Variation in timing, duration, intensity, and direction of adolescent growth in the mandible, maxilla, and cranial base: The Fels longitudinal study. Anat Rec 2014; 297: 1195–1207.

    Article  Google Scholar 

  8. 8

    Mukherjee S, Vikraman B, Sankar D, Veerabahu M . Evaluation of outcome following coronectomy for the management of mandibular third molars in close proximity to inferior alveolar nerve. J Clin Diagn Res 2016; 10: ZC57–ZC62.

    PubMed  PubMed Central  Google Scholar 

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Correspondence to M. G. Hussain.

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Hussain, M., Sah, S. & McHenry, I. Case report: coronectomy of an impacted and submerged second deciduous molar. Br Dent J 224, 20–21 (2018).

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