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 Table of Contents  
Year : 2019  |  Volume : 9  |  Issue : 2  |  Page : 429-433

Sequential removal of a large odontoma in the angle of the mandible

1 Department of Oral and Maxillo Facial Surgery, RVS Dental College and Hospital, Coimbatore, Tamil Nadu, India
2 Department of Prosthodontics, Crown and Bridge, RVS Dental College and Hospital, Coimbatore, Tamil Nadu, India
3 Department of Oral and Maxillo Facial Surgery, Meenakshi Ammal Dental College and Hospital, Chennai, Tamil Nadu, India
4 Department of Periodontology, RVS Dental College and Hospital, Coimbatore, Tamil Nadu, India
5 Department of Oral Pathology, RVS Dental College and Hospital, Coimbatore, Tamil Nadu, India

Date of Web Publication11-Dec-2019

Correspondence Address:
Kavitha Muthu
Department of Oral Pathology, RVS Dental College and Hospital, Coimbatore - 641 402, Tamil Nadu
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DOI: 10.4103/ams.ams_102_19

PMID: 31909030

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Odontomas are the commonly occurring benign tumors of the jaw, which are odontogenic in origin. Lesion originates as the dental components are laid down in a disorganized manner, due to failure of normal morphodifferentiation. They are considered as hamartomatous developmental malformations rather than a true neoplasm. Mostly, these asymptomatic lesions are discovered as an incidental finding. Large odontomas may give rise to local disturbances, such as eruption delay of permanent teeth, asymmetric tooth eruption, malpositioning, displacement, resorption, or occasional devitalization of adjacent teeth. Odontomas may erupt into the mouth and tend to be associated with impacted teeth and other cystic lesions. The odontomas have a tendency to become symptomatic due to local infection such as sinusitis, infected adjacent tooth, and the exposure of tumor to oral environment. The aim of this paper is to elucidate the primary features and treatment of these lesions, depending on published data and individual witness.

Keywords: Complex odontoma, odontogenic tumor, odontoma surgical procedure

How to cite this article:
Saravanan R, Sathyasree V, Manikandhan R, Deepshika S, Muthu K. Sequential removal of a large odontoma in the angle of the mandible. Ann Maxillofac Surg 2019;9:429-33

How to cite this URL:
Saravanan R, Sathyasree V, Manikandhan R, Deepshika S, Muthu K. Sequential removal of a large odontoma in the angle of the mandible. Ann Maxillofac Surg [serial online] 2019 [cited 2020 Aug 3];9:429-33. Available from:

  Introduction Top

Odontoma has been used for any tumor of odontogenic origin. Odontomas have been known as mixed odontogenic tumors since they are composed of both epithelial and ectomesenchymal components and are seen to have a deficit in the structural arrangement. This has led to an opinion that odontomas are hamartomatous lesions than a true neoplasm.[1] Odontomas are either inherited or associated with trauma during primary dentition as well as with inflammatory and infectious processes, hereditary anomalies (Gardner's syndrome, Hermann's syndrome, and otodental syndrome), odontoblastic hyperactivity, and alterations of genetic components responsible for controlling dental development.[2],[3] The distinction between complex and compound odontoma is arbitrary, being based on the preponderance of well-organized denticles as opposed to a preponderance of disorganized dental tissues rather than based on any absolute difference. According to the literature, the prevalence of odontome is more common in females and is usually seen in children and adolescents, with a peak incidence seen in the second decade of life. The anterior portions of the jaws are the most common site of occurrence. Compound odontomas are common than complex odontomas. Usually, odontomas are asymptomatic in nature; however, pain and swelling were the common clinical symptoms. It can also occur as a component of combined odontogenic tumor, most commonly calcifying cystic odontogenic tumor, and could also be associated with dentigerous cysts.[4],[5]

Clinically, central odontoma (intraosseous) is the most common variant than that of extraosseous type (peripheral) which could be found in the oral mucosa covering tooth-bearing areas of the maxilla and mandible. The erupted odontomes are essentially intraosseous odontome which erupted out into the oral cavity.[6],[7]

Radiographically, the lesion appears as a radiopaque mass surrounded by a radiolucent halo with regular borders. Surgical removal is the treatment of choice in most of the cases. Although there is a little probability of recurrence, a valuable time course observation is needed, especially in young children.[8],[9] A summary of the surgical procedure is present in [Table 1] for complex odontomas seen in the mandibular posterior region.
Table 1: Summary of the various treatment procedures for mandibular posterior complex odontoma

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  Case Report Top

A 12-year-old female patient along with her mother reported to the oral and maxillofacial surgery clinic with the chief complaint of swelling in the left lower back teeth region. On intraoral examination, a diffuse smooth swelling was found in the left mandibular angle extending till the lower border associated with an impacted second molar tooth. Expansion of both the buccal and lingual cortices was observed, and the area was firm and nontender. Mouth opening was within normal limits.

Radiograph revealed a radiopaque mass in the left mandibular angle region measuring 4 cm × 3 cm with well-defined borders and a radiolucent lining associated with the impacted second molar tooth [Figure 1].
Figure 1: Lateral cephalogram image of the odontoma

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Computerized tomographic image was suggestive of a well-defined rounded amorphous bony dense mass involving the left-sided angle of the mandible. The mass is principally arising from the left lower impacted second molar tooth with the intact cortex of the mandible and the lower border being very thin. The lesion was provisionally diagnosed as complex odontome [Figure 2]. The differential diagnosis would include osteoma and cemento-ossifying fibroma.
Figure 2: Computed tomography view of the odontoma

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After obtaining consent from the parents, surgical removal of odontome was planned in two stages after routine hematological investigations. The first stage of removal was done under general anesthesia. A regular third molar mucoperiosteal flap was retracted, and a bony window was created to expose the underlying odontome which was removed in sections. One-fourth of the odontome was left out intentionally in situ avoiding the fracture of the mandible and the extraction of the first molar, considering the age of the patient. The excised lesion was preserved for the histopathological examination [Figure 3], [Figure 4], [Figure 5], [Figure 6].
Figure 3: First stage of surgical removal

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Figure 4: First stage of surgical removal (after excision)

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Figure 5: Excised lesion

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Figure 6: Orthopantomogram showing the remaining portion of the lesion

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After 4 months, the second stage of surgery was planned. Unfortunately, the patient turned up only after 8 months with complaints of rough feeling over the alveolar ridge of the surgical area. The intraoral examination revealed a yellowish white sequestrum-like material which was exposed slightly through the oral mucosa, and orthopantomogram (OPG) was taken. It revealed a radiopaque mass just approaching the crest of the alveolar ridge. It was confirmed that the remaining one-fourth of the odontome erupted and reached the crest of the alveolar bone exposing itself into the oral cavity and it was removed surgically under local anesthesia. The wound was closed with 3-0 vicryl after achieving hemostasis. The excised lesion after reassembling revealed a bony mass and was sent for histopathological examination which confirmed the diagnosis of complex composite odontoma [Figure 7]. This presentation of residual odontoma eruption without the impacted teeth is very unusual.
Figure 7: Photomicrograph (×10) showing eosin-stained odontogenic components with adjacent clear spaces are appreciated indicating the components of complex odontoma

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The follow-up OPG after 6 years showed complete healing of that area without any recurrence.

  Discussion Top

Complex composite odontoma was described as a distinct entity for the first time by Broca in 1866. Complex odontomas are slow-growing, benign tumors showing nonaggressive behavior.

This report is regarding a case of “complex odontoma” which was removed successfully by a two-stage sequential surgical procedure. Various treatment modalities have been described for the treatment of odontoma. The size, location, extension of the lesion, histological aspects of odontoma, and age of the patient are the important factors which have to be considered while doing the surgical planning.

Blinder et al. in1993 reported that intraoral excision of the lesion via lingual cortex could be chosen for complex odontoma of the mandible to avoid unwanted fractures as the lingual cortex is much thinner than the buccal cortex. They also suggested that although dysesthesia of the homolateral tongue is the expected complication, it can be avoided with carefully elevated mucoperiosteum and protected by a curved retractor. This method also depends on whether the lingual and buccal cortical plates are eroded.[10]

Knezevic et al., in 2005, suggested the two-stage surgical removal of odontoma. It has been explained that osteosynthesis and intermaxillary fixation could be avoided by this method.[11]

Chrcanovic et al., in 2010, stated a two-stage surgical procedure for a large complex odontome at the angle of the mandible. In the first stage, most part of the tumor has been removed via lingual approach incision since the cortex was completely eroded and fixation was done for 4 weeks. Three months later, the remaining lesion was removed with the impacted teeth to avoid pathological mandibular fracture.[12]

Perumal et al., in 2013, treated a case of sequestrating complex odontoma over the posterior border of the mandible by surgical enucleation and packed with bismuth iodine paraffin paste soaked in a ribbon gauze.[13]

Nogueira et al., in 2015, treated a case of complex odontoma with no cortical expansion by a buccal corticotomy and fixation with titanium plates of 1.5 mm after the tumor is removed. The authors suggested that this method would keep the mandibular architecture and minimize the risk of fracture after surgery.[14]

Cezairil et al., in 2017, treated a case of large complex odontoma in a mandibular angle using full-thickness incision and sectioning and removing the fragments since the buccal and lingual cortex volume was sufficient. After the surgery, orthodontic elastics were placed between the canine and molar to minimize the mouth opening, diminishing the tension band on the external oblique ridge, and neutralizing the infrahyoid muscle forces.[15]

Akbulut, in 2018, treated a case of large complex odontoma of the mandible by using both intraoral and extraoral surgical methods and reconstruction was done with titanium plates.[16]

The present reported case was also planned similar to Knezevic et al. The surgery was planned for sequential removal of the tumor in two stages to avoid the fracture of the angle of the mandible and to preserve the first molar since accessing the tumor intraorally might have compromised the teeth. By considering the age of the patient, major portion of the tumor was removed at the first stage and the remaining portion which was close to the first molar and inferior border was left in situ purposefully for subsequent sequential removal after 4 months. The wound was closed with aseptic care. The procedure was well explained and accepted by the patient before the surgery. Unfortunately, the patient turned up only after 8 months with complaints of rough feeling over the surgical area, and the erupting left out portion of odontoma was removed under local anesthesia after confirming radiographically. For a two-stage surgical removal of odontome, the patient has to be advised regarding the significance of the second-stage surgical procedure.

It has been described that the eruption of odontoma without association of impacted teeth might be due to remodeling and resorption of overlying bone. The different absorption stages of alveolar bone can be seen in those cases and concluded that the possible mechanism of eruption could be multifactorial.[17]

The present case demonstrates the unusual presentation of spontaneous eruption of odontoma during the follow-up period. This unexpected complication could be avoided by proper patient instructions and different management approaches. The eruption of the remaining portion of odontoma could be due to remodeling and resorption of overlying bone. Since this patient is young and the inherent growth pattern of mandible still persists, the precise molecular mechanism behind the eruption phenomena has to be explored further.

Macroscopically, lesion consists primarily of a well-delineated, roughly spherical mass of haphazard conglomerate of mature hard dental tissues. A thin fibrous capsule and in some cases a cyst wall are seen surrounding the lesion.

Histopathologically, the decalcified hematoxylin and eosin section of the complex odontoma revealed the presence of disorderly arranged mature hard tissues, dentin, cementum, and soft tissue pulp with empty enamel spaces. The hard tissues were arranged in a pattern depicting tooth-like structures.

  Conclusion Top

The present report explains the successful treatment of odontoma in a young individual, with less complication and unusual presentation of spontaneous eruption of residual odontoma during the follow-up period. The eruption could be due to the increasing size of the lesion which may lead to the sequestration of the overlying bone. However, the precise molecular mechanism behind the spontaneous eruption of the remaining odontoma without the impacted teeth has to be explored further. Despite their benign nature, odontoma eruption into the oral cavity can give rise to pain, inflammation, and infection. If two-stage surgery is planned for removal of the lesion, the patient has to be emphasized the importance of the second-stage procedure on time to avoid further complications. The management approach of this kind of lesions has to be planned and implemented by keeping all the favorable and unfavorable factors in each treatment preference.

Declaration of patient consent

The authors certify that they have obtained all appropriate patient consent forms. In the form the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.

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Conflicts of interest

There are no conflicts of interest.

  References Top

Philipsen HP, Reichart PA, Praetorius F. Mixed odontogenic tumours and odontomas. Considerations on interrelationship. Review of the literature and presentation of 134 new cases of odontomas. Oral Oncol 1997;33:86-99.  Back to cited text no. 1
Owens BM, Schuman NJ, Mincer HH, Turner JE, Oliver FM. Dental odontomas: A retrospective study of 104 cases. J Clin Pediatr Dent 1997;21:261-4.  Back to cited text no. 2
Liu A, Wu M, Guo X, Guo H, Zhou Z, Wei K, et al. Clinical, pathological, and genetic evaluations of Chinese patient with otodental syndrome and multiple complex odontoma: Case report. Medicine (Baltimore) 2017;96:e6014.  Back to cited text no. 3
Budnick SD. Compound and complex odontomas. Oral Surg Oral Med Oral Pathol 1976;42:501-6.  Back to cited text no. 4
Or S, Yücetaş S. Compound and complex odontomas. Int J Oral Maxillofac Surg 1987;16:596-9.  Back to cited text no. 5
Satish V, Prabhadevi MC, Sharma R. Odontome: A Brief overview. Int J Clin Pediatr Dent 2011;4:177-85.  Back to cited text no. 6
Ragalli CC, Ferreria JL, Blasco F. Large erupting complex odontoma. Int J Oral Maxillofac Surg 2000;29:373-4.  Back to cited text no. 7
Park JC, Yang JH, Jo SY, Kim BC, Lee J, Lee W. Giant complex odontoma in the posterior mandible: A case report and literature review. Imaging Sci Dent 2018;48:289-93.  Back to cited text no. 8
Tomizawa M, Otsuka Y, Noda T. Clinical observations of odontomas in Japanese children: 39 cases including one recurrent case. Int J Paediatr Dent 2005;15:37-43.  Back to cited text no. 9
Blinder D, Peleg M, Taicher S. Surgical considerations in cases of large mandibular odontomas located in the mandibular angle. Int J Oral Maxillofac Surg 1993;22:163-5.  Back to cited text no. 10
Knezevic G, Sokler K, Knezevic AK. A two-stage surgical approach in the treatment of a large complex odontoa of the mandible. Acta Stomatol Croat 2005;39:221-3.  Back to cited text no. 11
Chrcanovic BR, Jaeger F, Freire-Maia B. Two-stage surgical removal of large complex odontoma. Oral Maxillofac Surg 2010;14:247-52.  Back to cited text no. 12
Perumal CJ, Mohamed A, Singh A, Noffke CE. Sequestrating giant complex odontoma: A case report and review of the literature. J Maxillofac Oral Surg 2013;12:480-4.  Back to cited text no. 13
Nogueira AS, Gonçales ES, Gonçales AG, Thiegui-Neto V, Nogueira CB, Nogueira A, et al. Surgical treatment of extensive complex odontoma in the mandible by corticotomy. A case report. Minerva Stomatol 2013;62:335-42.  Back to cited text no. 14
Cezairil BF, Taskensen U, Coskun U, Cezairil NS, Tosun E. Surgical treatment of a large complex odontoma. Meandros Med Dent 2017;18:148-53.  Back to cited text no. 15
Akbulut N. Huge complex odontomas in two cases with unique history and treatment protocols. Clin Surg 2018;3:1888.  Back to cited text no. 16
Zhuoying C, Fengguo Y. Huge erupted complex odontoma in maxilla. Oral Maxillofac Surg Cases 2019;5:100096.  Back to cited text no. 17


  [Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5], [Figure 6], [Figure 7]

  [Table 1]


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