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CASE REPORT
Year : 2009  |  Volume : 27  |  Issue : 2  |  Page : 108-110
 

Bilateral fusion of mandibular primary teeth


Department of Pedodontics and Preventive Dentistry, Christian Dental College and Hospital, C.M.C., Ludhiana, India

Date of Web Publication31-Aug-2009

Correspondence Address:
A M Thomas
Department of Pedodontics and Preventive Dentistry, Christian Dental College and Hospital, Brown Road, Ludhiana, Punjab-141 008
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0970-4388.55336

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   Abstract 

The aim of the report was to highlight the rarity of occurrence of bilaterally fused mandibular primary lateral incisors and canines by virtue of the number of such cases reported in literature; to identify congenital absence of successor teeth;and to evaluate their pulpal morphologies to understand the type of fusion. Clinical observation along with an orthopantomograph and periapical radiographs were used to arrive at a diagnosis. The pulpal morphologies varied in each of the fused teeth although both were fusions of the Complete type. There was congenital absence of the permanent mandibular lateral incisors, bilaterally. It was a case of bilateral fusion of mandibular primary lateral incisors and canines of the Complete type with congenitally absent mandibular permanent lateral incisors. Only 13 such cases have been previously reported in literature.


Keywords: Canine, fusion, lateral incisor, primary, bilateral, teeth


How to cite this article:
Chalakkal P, Thomas A M. Bilateral fusion of mandibular primary teeth. J Indian Soc Pedod Prev Dent 2009;27:108-10

How to cite this URL:
Chalakkal P, Thomas A M. Bilateral fusion of mandibular primary teeth. J Indian Soc Pedod Prev Dent [serial online] 2009 [cited 2017 May 29];27:108-10. Available from: http://www.jisppd.com/text.asp?2009/27/2/108/55336



   Introduction Top


A fused tooth can be defined as a single enlarged or joined tooth in which the tooth count reveals a missing tooth when the anomalous tooth is counted as one. Its occurrence is more in the primary dentition (0.5%) compared to the permanent dentition (0.1%), with a rare chance of bilateral involvement in the primary dentition (0.02%). [1]

Eighty-three percent of cases of bilateral fusion in the primary dentition are found in the mandible, out of which, 70% show the involvement of the lateral incisors and canines. [2] The most common problem related to fused teeth is hypodontia of the permanent dentition which has been observed in 50% of affected subjects. [3]

The purpose of this article is to highlight the rarity of the condition and to evaluate the presence of any associated pathology.


   Case Report Top


An 8-year-old boy reported to the Department of Pedodontics and Preventive Dentistry with the complaint of having large teeth within his lower jaw. His medical history was irrelevant with his condition.

Intraoral examination revealed bilateral presence of unusually large teeth in the lower incisor canine region. Both sides were strongly suggestive of conjoined primary lateral incisors and canines [Figure 1]. Deep labio-lingual grooves were associated with both the enlarged teeth.

Radiographic evaluation of the left side revealed fused 72 and 73 with a single root and root canal [Figure 2]. On the right side, two distinct roots and root canals were evident of the fused 82 and 83 [Figure 3].

The primary mandibular canines were missing, confirming that it was a case of fusion and not gemination. An orthopantomograph revealed congenital absence of thepermanent mandibular lateral incisors [Figure 4].

The patient was diagnosed to be a case of bilaterally fused mandibular primary lateral incisors and canines of the Complete type with congenitally absent mandibular permanent lateral incisors.


   Discussion Top


It has been thought that some physical force or pressure produces contact between developing teeth resulting in their subsequent fusion. It can occur between normal teeth or between normal and supernumerary teeth. [4]

Fusion can be classified into two types, Complete and Incomplete. They can be differentiated as in [Table 1].

Only 13 cases of bilateral fusion of mandibular primary lateral incisors and canines have been reported in literature since 1940. [5],[6],[7],[8],[9],[10],[11],[12],[13],[14],[15] Hagman reported that such patients have a 75% chance of lacking the succedaneous lateral incisor. [16] The presence of fissures or grooves at the union between fused teeth predisposes it to caries and periodontal disease. [17] The greater root surface area of fused primary teeth may delay its resorption. [18]

Fused teeth may also contribute to esthetic concerns, space problems, occlusal disturbances, and delayed eruption of the permanent successors. Hence, careful monitoring of the condition is recommended.

 
   References Top

1.Neville BW, Damm DD, Allen CM, Bouquot JE, editors. Abnormalities of teeth. In: Oral and Maxillofacial Pathology. 2 nd ed. New Delhi: Elsevier; 2005. p. 49-106.  Back to cited text no. 1    
2.Dunkan WK, Helpin ML. Oral Surg Oral Med Oral Pathol 1987;64:82-7.  Back to cited text no. 2    
3.Guimarães Cabral LA, Firoozmand LM, Dias Almeida J. Double teeth in primary dentition: Report of two clinical cases. none Med Oral Patol Oral Cir Bucal 2008;13:E77-80.  Back to cited text no. 3    
4.Rajendran R. Developmental disturbances of oral and paraoral structures. In: Rajendran R, Sivapathasundharam B, editors. Shafer's Textbook of Oral Pathology. 5 th ed. New Delhi: Elsevier; 2006. p. 3-112.  Back to cited text no. 4    
5.Tinn CA. Excess, deficiency and gemination in the deciduous and permanent dentition of school children. Br Dent J 1940;68:236-8.  Back to cited text no. 5    
6.Menczer LF. Anomalies of the primary dentition. J Dent Child 1955;22:57-62.  Back to cited text no. 6    
7.Pogrel H. Case of bilateral gemination of deciduous incisors with congenital absence of permanent successors. Dent Pract 1956;7:13-4.  Back to cited text no. 7    
8.Munro D. Gemination in the deciduous dentition. Br Dent J 1958;104:238-40.  Back to cited text no. 8    
9.Brook AH, Winter GB. Double teeth. Br Dent J 1970;129:123-30.  Back to cited text no. 9    
10.Ravn JJ. Aplasia, supernumerary teeth and fused teeth in the primary dentition. Scand J Dent Res 1971;79:1-6.  Back to cited text no. 10    
11.Nick-Hussein NN. Bilateral symmetrical fusion of primary and permanent mandibular lateral incisors and canines. J Pedod 1989;13:378-83.  Back to cited text no. 11    
12.Prabhu NT, Rebecca J, Munshi AK. Bilaterally fused primary mandibular incisors: A case report. J Indian Soc Pedod Prev Dent 1997;15:31-3.  Back to cited text no. 12  [PUBMED]  
13.Milano M, Seybold SV, McCandless G, Cammarata R. Bilateral fusion of the mandibular primary incisors: Report of case. ASDC J Dent Child 1999;66:280-2, 229. Review.  Back to cited text no. 13    
14.Alpoz AR, Munanoglu D, Oncaq O. Mandibular bilateral fusion in primary dentition: Case Report. J Dent Child (Chic) 2003;70:74-6.  Back to cited text no. 14    
15.Hagman FT. Fused primary teeth: A documented familial report of case. ASDC J Dent Child 1985;52:459-60.  Back to cited text no. 15    
16.Hagman FT. Anomalies of form and number, fused primary teeth, a correlation of the dentitions. ASDC J Dent Child 1988;55:359-61.  Back to cited text no. 16    
17.Nunes E, de Moraes IG, de Oliviera Novaes PM, de Sousa SMG. Bilateral fusion of mandibular second molars with supernumerary teeth: Case Report. Braz Dent J 2002;13:137-41.  Back to cited text no. 17    
18.Brook AH, Winter GB. Double teeth. A retrospective study of 'geminated' and 'fused' teeth in children. Br Dent J 1970;129:123-30.  Back to cited text no. 18    


    Figures

  [Figure 1], [Figure 2], [Figure 3], [Figure 4]
 
 
    Tables

  [Table 1]


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    Abstract
    Introduction
    Case Report
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