Unerupted teeth associated with dentigerous cysts and treated with coronectomy: mini case series


      There is a resurgence of interest in coronectomy, but its appropriate application in the management of third molar teeth has yet to be defined. Dentigerous cysts associated with unerupted teeth are most commonly associated with mandibular third molars. In this case series we evaluate outcome after coronectomy of teeth with associated dentigerous cysts in cases where the inferior dental nerve was thought to be at risk, or there was an increased risk of mandibular fracture. We retrospectively studied 21 consecutive patients treated by coronectomy for dentigerous cysts at the Oral Surgery Department at Guy's Hospital. The most commonly affected teeth were mandibular third molars (20/21). One patient had permanent injury to the inferior dental nerve, but no mandibular fracture or recurrence of cyst was reported. One patient required secondary retrieval of the retained root because of eruption. Coronectomy of unerupted teeth associated with dentigerous cysts is an effective treatment when there is high risk of injury to the inferior dental nerve injury or potential for mandibular fracture. Further work with larger numbers and longer follow-up is required to discover the long-term outcome of the electively retained root.


      To read this article in full you will need to make a payment

      Purchase one-time access:

      Academic & Personal: 24 hour online accessCorporate R&D Professionals: 24 hour online access
      One-time access price info
      • For academic or personal research use, select 'Academic and Personal'
      • For corporate R&D use, select 'Corporate R&D Professionals'


      Subscribe to British Journal of Oral and Maxillofacial Surgery
      Already a print subscriber? Claim online access
      Already an online subscriber? Sign in
      Institutional Access: Sign in to ScienceDirect


        • Motamedi M.H.
        • Talesh K.T.
        Management of extensive dentigerous cysts.
        Br Dent J. 2005; 198: 203-206
        • Assael L.A.
        Surgical management of odontogenic cysts and tumors.
        in: Principles of oral and maxillofacial surgery. vol. 2. JB Lippincott, Philadelphia1992: 685-688
        • Neville B.W.
        Odontogenic cysts and tumors.
        in: Neville B.W. Damm D.D. Allen C.M. Bouquot J.E. Oral and maxillofacial pathology. WB Saunders, Philadelphia1995: 493-496
        • Regezi J.A.
        Cyst and cyst-like lesions.
        in: Regezi J.A. Sciubba J. Pogrel M.A. Atlas of oral and maxillofacial pathology. WB Saunders, Philadelphia2000: 88
        • Martínez-Pérez D.
        • Varela-Morales M.
        Conservative treatment of dentigerous cysts in children: report of four cases.
        J Oral Maxillofac Surg. 2001; 59: 331-333
        • Adams A.M.
        • Walton A.G.
        Case report. Spontaneous regression of a radiolucency associated with an ectopic mandibular third molar.
        Dentomaxillofac Radiol. 1996; 25: 162-164
        • Irving S.P.
        Spontaneous regression of a dentigerous cyst in a middle-aged adult.
        Oral Surg Oral Med Oral Pathol. 1984; 57: 604-605
        • Freedman G.L.
        A disappearing dentigerous cyst: report of a case.
        J Oral Maxillofac Surg. 1988; 46: 885-886
        • Patel V.
        • Moore S.
        • Sproat C.
        Coronectomy – oral surgery's answer to modern day conservative dentistry.
        Br Dent J. 2010; 209: 111-114
        • Renton T.
        • Hankins M.
        • Sproate C.
        • et al.
        A randomised controlled clinical trial to compare the incidence of injury to the inferior alveolar nerve as a result of coronectomy and removal of mandibular third molars.
        Br J Oral Maxillofac Surg. 2005; 43: 7-12
        • O’Riordan B.
        Coronectomy (intentional partial odontectomy of lower third molars).
        Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2004; 98: 274-280
        • Hatano Y.
        • Kurita K.
        • Kuroiwa Y.
        • et al.
        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
        • Leung Y.Y.
        • Cheung L.K.
        Safety of coronectomy versus excision of wisdom teeth: a randomized controlled trial.
        Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2009; 108: 821-827
        • Ecuyer J.
        • Debien J.
        Deductions operatoires.
        Actual Odontostomatol (Paris). 1984; 38 ([in French]): 695-702
        • Malden N.
        • D’Costa e Rego A.
        Coronectomy of a third molar with cyst lining enucleation in the management of a dentigerous cyst.
        Dent Update. 2010; 37: 622-624
        • Patel V.
        • Gleeson C.F.
        • Kwok J.
        • et al.
        Coronectomy practice. Paper 2: complications and long term management.
        Br J Oral Maxillofac Surg. 2012; ([Epub ahead of print])
        • Pogrel M.A.
        • Lee J.S.
        • Muff D.F.
        Coronectomy: a technique to protect the inferior alveolar nerve.
        J Oral Maxillofac Surg. 2004; 62: 1447-1452
        • Dolanmaz D.
        • Yildirim G.
        • Isik K.
        • et al.
        A preferable technique for protecting the inferior alveolar nerve: coronectomy.
        J Oral Maxillofac Surg. 2009; 67: 1234-1238
        • Freedman G.L.
        Intentional partial odontectomy: report of case.
        J Oral Maxillofac Surg. 1992; 50: 419-421
        • Knutsson K.
        • Lysell L.
        • Rohlin M.
        Postoperative status after partial removal of the mandibular third molar.
        Swed Dent J. 1989; 13: 15-22