Case Reports in Dentistry

Case Reports in Dentistry / 2014 / Article

Case Report | Open Access

Volume 2014 |Article ID 639173 |

Sreenivasan Bhargavan Sarojini, Ektah Khosla, Thomas Varghese, Leena Johnson Arakkal, "Eruption of Odontomas into the Oral Cavity: A Report of 2 Cases", Case Reports in Dentistry, vol. 2014, Article ID 639173, 4 pages, 2014.

Eruption of Odontomas into the Oral Cavity: A Report of 2 Cases

Academic Editor: Ricardo Alves de Mesquita
Received06 Feb 2014
Revised22 Mar 2014
Accepted24 Apr 2014
Published11 May 2014


Odontomas are the commonest odontogenic tumors of the oral cavity and are by nature asymptomatic. They consist mainly of dental tissue that may or may not be arranged in an orderly fashion. Their presence is often detected accidentally or due to the presence of a dental disturbance such as an unerupted tooth. The very rarity of odontomas erupting into the oral cavity validates the need for more current literature on the phenomenon. Our report of two cases aims to present and discuss the rare event of an erupting odontoma with the dental community.

1. Introduction

The term odontoma was first coined by Paul Broca in 1867 and was employed as a generalized term to refer to all odontogenic tumors [1]. He defined them as “tumors formed by the overgrowth of transient or complete dental tissues” [2]. These lesions occur mostly within the bone though instances where it has been localized in the gingival have also been reported [3].

Recent times have seen this entity being regarded by some authors as more of a hamartoma than a true neoplasm [4]. According to the WHO classification (2005) odontomas are divided into 2 types: (a) compound odontoma—which consists of miniature tooth—like denticles, (b) complex odontoma—which consists of an irregular mass of hard and soft dental tissue [1, 5]. Another classification divides them into intraosseous and extraosseous odontomas based on their location [6].

They account for 22–67% of all maxillary tumors [7] with an increased prevalence in children and adolescents [4, 8]. Odontomas have a limited growth potential and are often detected on taking a routine radiographic examination [9] to determine the reason for an unerupted tooth or a retained primary tooth. Majority of all odontomas are detected during the first two decades of life [8]. The sex predilection is considered controversial as some authors report an equal distribution among sexes [10] while others report a male predominance [11] whereas yet another group have reported a female predominance [12]. In our case series one patient was male while the other was female.

The eruption of odontomas into the oral cavity is a rare phenomenon and may be associated with complications such as pain, infection, and delay in the eruption of permanent teeth. As of 2009 only 20 cases of erupted odontomas have been reported in the literature [7]. Though rare, dentists should be aware of the potential possibility of encountering such cases and the difficulties they pose with regard to treatment. The very rarity of odontomas erupting into the oral cavity validates the need for more current literature on this phenomenon.

2. Case Report

2.1. Case Report 1

A 12-year-old male patient presented with complaint of the presence of a small hard mass in maxillary anterior region. He had no complaint of pain nor was any other relevant medical history elicited. The intraoral examination revealed a small whitish oval tooth-like structure present in maxillary anterior region between 11 and 12, and both teeth exhibited a slight rotation (Figure 1). On enquiry, the patient reported having noticed its presence since the age of nine. He reported no pain or any associated symptoms during or after the appearance of the lesion. No prior records or radiographs were available as this was the patient’s first dental consultation.

The lesion was hard and nontender and the gingiva around it appeared normal. An intraoral periapical radiograph (Figure 2) and a panoramic radiograph (Figure 3) were taken which revealed irregular tooth-like structures similar to the density of dental tissues seen between 11 and 12 suggestive of an erupted compound odontoma.

The odontoma was removed surgically under local anaesthesia and the specimen (as seen in Figure 4) sent for histopathologic examination that revealed the specimen to be a compound odontoma with the microscopic appearance showing enamel, dentin, pulp chamber, and cementum resembling the structure of tooth as seen in Figure 5.

The patient was subsequently followed up for a period of one year and no recurrence of the lesion was seen.

2.2. Case Report 2

A 16-year-old female patient reported with the complaint of a mass in the anterior maxilla since the age of eight years. The eruption was not associated with pain or any other symptoms. During the intraoral examination an agglomerated mass of calcified structure was seen in the place of missing 11 and 12 (Figure 6).

An anterior maxillary occlusal view showed a mass with varying radiodensity resembling enamel, dentin, and cementum. This mass appeared to be attached to a root-like structure with wide root canal and open root apex (Figure 7). The calcified mass was surgically removed (Figure 8) and sent for histopathologic examination which revealed the presence of enamel, dentin, pulp, and cementum as seen in Figure 9.

The patient is currently under follow-up for the last seven months and has not shown any incidence of recurrence so far.

3. Discussion

An odontoma is a tumor of unknown etiology and is found frequently associated with a dental germ in development, a supernumerary tooth, or even a retained primary tooth [9]. They are the most common type of tumor of odontogenic origin [13]. Of the two varieties in existence, the compound odontoma has shown a predilection for the anterior portion of the maxilla whereas complex odontomas show a preference for the posterior region of the mandible [14].

Their exact etiology remains obscure but possibly includes trauma to primary dentition, inflammatory and infectious processes, odontoblastic hyperactivity, mutant gene [15], and hereditary anomalies such as Gardner’s syndrome and Hermann’s syndrome [3]. Neither of our cases gave a history of any similar etiologies nor were they suffering from any syndromes. Odontomas are generally asymptomatic and rarely assumed dimensions greater than an average tooth, but if they attain an unusually large size can cause expansion of the cortical bone [16]. Both of our cases were asymptomatic and exhibited a size more or less within normal limits. The largest reported in the literature so far weighed 0.3 kg [17].

The spontaneous eruption of an odontoma into the oral cavity is an exceptional circumstance. Such an instance may be associated with pain, inflammation of the surrounding soft tissue, or infection and suppuration [18]. Due to the lack of periodontal ligament and therefore lack of contractility of fibroblasts around the odontoma, the mechanism of eruption is thought to be different from that of a conventional tooth. A few possibilities have been put forward and one of which states that the increasing size of the odontoma may lead to sequestration of the overlying bone and the subsequent occlusal movement. Another possibility implicates bony remodelling as a probable cause [5]. But despite the existence of such theories, the exact mechanism still remains unknown.

The radiographic appearance and histopathology are distinctive. The complex odontoma appears as an irregular calcified mass surrounded by a thin radiolucent area with a smooth periphery and the compound odontoma appears as multiple calcified tooth-like structures in the centre of a well-defined radiolucent region [19]. The histopathology most commonly reveals enamel matrix, dentine, pulp tissue, and cementum that may or may not exhibit a normal relationship surrounded by a connective tissue capsule that is similar to the normal dental follicle [20]. It is suggested that all odontomas be sent for a histopathological analysis in order to rule out ameloblastic odontoma and ameloblastic fibroodontoma and to obtain a definitive diagnosis [1, 12].

Timely detection and prompt surgical treatment followed by curettage are recommended to prevent complications such as tooth loss, cystic changes, bone expansion, and delayed eruption [19].

4. Conclusion

Odontomas are commonly occurring benign entities but rarely do they erupt into the oral cavity. We have presented two such rare cases where the odontomas have erupted into the oral cavity. Despite their benign nature, it is important that odontomas be treated promptly and conservatively so as to prevent the formation or facilitate the early correction of any dental and occlusal disturbances.

Conflict of Interests

The authors declare that there is no conflict of interests regarding the publication of this paper.


  1. R. Baldawa, K. Khante, J. Kalburge, and V. Kasat, “Orthodontic management of an impacted maxillary incisor due to odontoma,” Contemporary Clinical Dentistry, vol. 2, no. 1, pp. 37–40, 2011. View at: Publisher Site | Google Scholar
  2. P. Batra, R. Duggal, O. P. Kharbanda, and H. Parkash, “Orthodontic treatment of impacted anterior teeth due to odontomas: a report of two cases,” Journal of Clinical Pediatric Dentistry, vol. 28, no. 4, pp. 289–294, 2004. View at: Google Scholar
  3. H. Salgado and P. Mesquita, “Compound odontoma—case report,” Revista Portuguesa de Estomatologia, Medicina Dentária e Cirurgia Maxilofacial, vol. 54, no. 3, pp. 164–165, 2013. View at: Google Scholar
  4. R. Cawson, W. Binnie, P. Speight, A. Barrett, and J. Wright, Luca’s Pathology of Tumors in Oral Tissues, Churchill Livingstone, London, UK, 5th edition, 1998.
  5. M. Vengal, H. Arora, S. Ghosh, and K. M. Pai, “Large erupting complex odontoma: a case report,” Journal of the Canadian Dental Association, vol. 73, no. 2, pp. 169–172, 2007. View at: Google Scholar
  6. L. Junquera, J. C. de Vicente, P. Roig, S. Olay, and O. Rodríguez-Recio, “Intraosseus odontoma erupted into the oral cavity: an unusual pathology,” Medicina Oral, Patologia Oral y Cirugia Bucal, vol. 10, no. 3, pp. 248–251, 2005. View at: Google Scholar
  7. G. Serra-Serra, L. Berini-Aytés, and C. Gay-Escoda, “Erupted odontomas: a report of three cases and review of the literature,” Medicina Oral, Patologia Oral y Cirugia Bucal, vol. 14, no. 6, pp. E299–E303, 2009. View at: Google Scholar
  8. B. L. Nelson and L. D. R. Thompson, “Compound odontoma,” Head and Neck Pathology, vol. 4, no. 4, pp. 290–291, 2010. View at: Publisher Site | Google Scholar
  9. M. S. Thwaites and J. L. Camancho, “Complex odontoma—report of a case,” Journal of Dentistry for Children, vol. 54, no. 4, pp. 286–288. View at: Google Scholar
  10. B. H. de Oliveira, V. Campos, and S. Marçal, “Compound odontoma—diagnosis and treatment: three case reports,” Pediatric Dentistry, vol. 23, no. 2, pp. 151–157, 2001. View at: Google Scholar
  11. L. Garcia-Consuegra, L. M. J. Gutierrez, J. M. A. Castro, and O. R. Recio, “Odontomas. A clinical-histological and retrospective epidemiological study of 46 cases,” Medicina Oral, vol. 5, no. 5, pp. 367–372, 2000. View at: Google Scholar
  12. I. Iatrou, E. Vardas, N. Theologie-Lygidakis, and M. Leventis, “A retrospective analysis of the characteristics, treatment and follow-up of 26 odontomas in Greek children,” Journal of Oral Science, vol. 52, no. 3, pp. 439–447, 2010. View at: Google Scholar
  13. D. M. Cohen and I. Bhattacharyya, “Ameloblastic fibroma, ameloblastic fibro-odontoma, and odontoma,” Oral and Maxillofacial Surgery Clinics of North America, vol. 16, no. 3, pp. 375–384, 2004. View at: Publisher Site | Google Scholar
  14. M. Tomizawa, Y. Otsuka, and T. Noda, “Clinical observations of odontomas in Japanese children: 39 cases including one recurrent case,” International Journal of Paediatric Dentistry, vol. 15, no. 1, pp. 37–43, 2005. View at: Publisher Site | Google Scholar
  15. A. D. Hitchin, “The aetiology of the calcified composite odontomes,” British Dental Journal, vol. 130, no. 11, pp. 475–482, 1971. View at: Publisher Site | Google Scholar
  16. R. A. Cawson, W. H. Binnie, and J. W. Eveson, “Color atlas of oral disease,” in Clinical and Pathological Correlations, pp. 6–19, Mosby-Wolfe, Hong Kong, 1993. View at: Google Scholar
  17. M. Mupparapu, S. R. Singer, and J. Rinaggio, “Complex odontoma of unusual size involving the maxillary sinus: report of a case and review of CT and histopathologic features,” Quintessence International, vol. 35, no. 8, pp. 641–645, 2004. View at: Google Scholar
  18. M. Ferrer, F. Silvestre, E. Estelles, and D. Grau, “Infeccion recurrente de un odontoma complejo tras su aperture a la boca,” Medicina Oral, vol. 6, no. 4, pp. 269–275, 2001. View at: Google Scholar
  19. W. G. Shafer, M. K. Hine, and B. M. Levy, A Textbook of Oral Pathology, Saunders, Philadelphia, Pa, USA, 4th edition, 1983.
  20. J. B. John, R. R. John, I. Punithavathy, and I. Elango, “Compound odontoma associated with maxillary primary tooth—a case report,” Journal of India Academy of Dental Specialists, vol. 1, pp. 49–51, 2010. View at: Google Scholar

Copyright © 2014 Sreenivasan Bhargavan Sarojini et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

More related articles

 PDF Download Citation Citation
 Download other formatsMore
 Order printed copiesOrder

Related articles