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| CASE REPORT |
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| Year : 2017 | Volume
: 5
| Issue : 2 | Page : 44-47 |
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Familial occurrence of numerical variants hypodontia and hyperdontia in siblings: A rare report in primary dentition
Sreekanth Kumar Mallineni1, Srinivasulu Sakhamuri1, Radhika Kunduru2, Karthik Anchala1
1 Narayana Dental College and Hospital, Nellore, Andhra Pradesh, India
2 Abhiram Institute of Medical Science, Nellore, Andhra Pradesh, India
| Date of Web Publication | 14-Nov-2018 |
Correspondence Address:
Dr. Sreekanth Kumar Mallineni
Narayana Dental College and Hospital, Nellore, Andhra Pradesh
India
 Source of Support: None, Conflict of Interest: None  | Check |
DOI: 10.4103/njecp.njecp_8_16
Hypodontia is a condition of less teeth than normal complement while when there are more teeth than complement, it is called hyperdontia. The occurrence of hypodontia and hyperdontia in a family is very rare. The purpose of this short communication is to describe the occurrence of numerical variants of hypodontia and hyperdontia in siblings belonging to a family. Studies have indicated genetic factors may influence numerical variations of teeth. A genetic correlation of hypodontia and hyperdontia has been described and suggested for further studies. As with hypodontia, hyperdontia in the primary dentition is rare.
Keywords: Dental anomalies, familial occurrence, hyperdontia, hypodontia, siblings
How to cite this article:
Mallineni SK, Sakhamuri S, Kunduru R, Anchala K. Familial occurrence of numerical variants hypodontia and hyperdontia in siblings: A rare report in primary dentition. Niger J Exp Clin Biosci 2017;5:44-7 |
How to cite this URL:
Mallineni SK, Sakhamuri S, Kunduru R, Anchala K. Familial occurrence of numerical variants hypodontia and hyperdontia in siblings: A rare report in primary dentition. Niger J Exp Clin Biosci [serial online] 2017 [cited 2019 Feb 15];5:44-7. Available from: http://www.njecbonline.org/text.asp?2017/5/2/44/245408 |
| Introduction | |  |
Congenital absence of one or multiple teeth is called hypodontia. The absence of six or several teeth has been called oligodontia and anodontia is an extreme expression of oligodontia indicating the total absence of dental structures. The prevalence of hypodontia ranges from 0% to 4.1% in the primary dentition[1] and highest prevalence reported in Southern Chinese (4.1%). There is no significant gender predilection reported in primary dentition school children while Brook[2] found female predilection in British school children. Hypodontia is more commonly seen in the anterior region in primary dentition. Mandibular arch is frequently more affected than the maxillary arch[3],[4],[5] conversely, Brook[2] and Yonezu et al.[6] reported in the maxillary arch. Mandibular incisors are the commonly missing tooth type in primary dentition,[2] unlike the findings of other reported studies in where the maxillary lateral incisors were the commonly missing teeth.[4],[7] The previous dental history is necessary to eliminate the possibility of extraction of a normal tooth before diagnosis of hypodontia.[2]
A dentition with any additional tooth, or structure formed from a tooth germ hyperdontia refers to a dentition that has one, or more extra normal, or abnormal teeth. These supernumerary teeth can arise as a result dichotomy,[8] or extra budding of the dental lamina[9] and the exact etiology is not clearly documented. Several reports have indicated that there is a racial difference in the incidence of hyperdontia. The literature indicates a range from 0.1% to 1.8% for Caucasians, 0.1% for Japanese, and 7.8% for Taiwan school children. Boys are frequently affected in primary dentition[2] inversely; few studies showed a higher prevalence in girls.[4],[5],[10] In primary dentition, supernumerary teeth are commonly seen in maxillary arch and very rare in mandibular arch. Almost 50% of the supernumerary teeth were observed along the midline apart from the mesiodens, maxillary incisor region common region that has been reported.
Occurrence of these two numerical variants in primary dentition is very rare. The developmental anomalies such as talon cusps,[11] hyperdontia,[12] hypodontia,[13] and concomitant of hypo-hyperdontia[14] have been reported in siblings. Hypodontia and hyperdontia are two extreme numerical variants, the occurrence of these two variants in siblings have not been reported in the literature. Therefore, the purpose of this report is to describe a familial occurrence of hypodontia and hyperdontia in siblings [Figure 1] affecting primary dentition. | Figure 1: Showing frontal view of both siblings case 1(a) and case 2(b).
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| Case Reports | | |
Case no 1
An 8-year and 1-month-old Indian boy presented to pediatric dental clinic with a chief complaint of delayed eruption of teeth. His medical and dental histories were unremarkable, and he is the first child to a nonconsanguineous couple. Extraorally, he presented with symmetrical face, competent lips with convex profile [Figure 1]a. Intraoral examination revealed that he was in early mixed dentition with inadequate oral hygiene. There was evidence of palatally erupted supernumerary tooth in relation to tooth 61, and no active carious lesions were noted. Radiographic examination showed delayed eruption of tooth 21 due to erupted supernumerary tooth and retained primary teeth 61, 62 [Figure 2]. Extraction of supernumerary tooth and teeth 61, 62 done under local anesthesia and all first permanent molars were restored with fissure sealants as a preventive measure. The patient was reviewed until 6 months for complete eruption of teeth 11, 21. | Figure 2: Panoramic view of case no 1 showing erupted supernumerary tooth (arrow) in maxillary arch which interfering the eruption of tooth 21 (dotted arrow)
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Case no 2
A 5-year and 3-month-old boy, who was younger brother of the same boy, presented with chief complaint of decayed tooth in lower left back region. His medical and dental histories were not remarkable. Extraoral examination showed symmetrical face, competent lips, and strait profile [Figure 1]b. Intraorally, he presented with primary dentition with adequate oral hygiene, and carious lesion was observed in relation to tooth 75. On the right side, one incisor as found to be congenitally missing in mandibular arch, and macrodontic incisor was evident on the right side of the arch [Figure 3]. Radiographic examination confirmed missing incisor on the right side mandibular in primary dentition and presence of all permanent incisors and other teeth for his age. Tooth 75 was restored with composite, and teeth 55, 65, and 85 were restored with fissure sealants. | Figure 3: Panoramic view of case no 2 showing congenitally missing primary incisor (dashed arrows) and presence of all permanent incisors (arrows) in mandibular arch
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| Discussion | | |
Maxillary mesiodens and supernumerary teeth in maxillary incisor region are commonly seen in primary dentition.[1] The orientation of supernumerary teeth in anterior maxilla could be normal, inverted, and transverse.[15] Almost all of these supernumerary teeth were unerupted (97.0%), this was contrary to the findings of Luten,[10] who reported that all of the supernumerary teeth in his study were erupted; and Humerfelt et al.,[16] who reported that 73% of supernumerary teeth found in their study were erupted. The supernumerary teeth found in these patients mostly had an inverted orientation rather than normal or transverse which is contrary to the findings of Huang et al.,[9] who found that most mesiodens had a normal orientation. As normally orientated supernumerary teeth often erupt, the high prevalence of inverted teeth found in this study may explain why 97.0% of the supernumerary teeth were unerupted. It has been reported that supernumerary teeth may cause crowding, delayed eruption, displacement, rotations, resorption, and cystic changes.[17] Similar in the present case, erupted supernumerary tooth caused delayed eruption of tooth 21 and rotation of tooth 11. However, the erupted supernumerary tooth was extracted, and the patient (Case 1) was reviewed for 6 months until the eruption of both 11, 21 completely.
Moreover, an association between hypodontia and ankylosis of primary molars, enamel hypoplasia, peg-shaped incisors, and taurodontism has been documented.[18] Several studies have shown that most of the cases of hypodontia in the primary dentition are followed by hypodontia in the permanent dentition in the same region.[18],[19],[20] Contrarily, in our Case No. 2, hypodontia was evident in primary dentition only, and it was not associated with permanent dentition. Mutations in the genes of MSX1 and PAX9 have been related with oligodontia in the posterior teeth, and the mode of inheritance is autosomal dominant.[21],[22] It has been reported that the differences in gene frequency, the inheritance mode, and autosomal recessive are responsible for the variations in prevalence figures.[23] More recent studies have identified genes that cause the absence of teeth in generations of nonsyndrome patients similar to this case.
The occurrence of hypodontia and hyperdontia alone in primary dentition is extremely rare. The etiologies for both numerical variants have not been clearly stated. However, it has been hypothesized that both environmental and genetical factors are responsible.[24] The use of panoramic radiography is recommended, together with clinical examination for the identification of these numerical dental anomalies. Identifying and counting the existing teeth would assist to recognize missing teeth. Nevertheless, it must be kept in mind that the development of teeth may vary markedly among patients.
| Conclusion | | |
The occurrence of these two numerical variants in primary dentition is very rare. Hypodontia and hyperdontia are two extreme numerical variants, the occurrence of these two variants in siblings have not been reported in the literature. To the best of our knowledge, these are only Indian participants that have been reported on the occurrence of two numerical anomalies in siblings affecting primary dentition. A genetic correlation of hypodontia and hyperdontia has been described and suggested for further studies.
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.
Financial support and sponsorship
Nil.
Conflicts of interest
There are no conflicts of interest.
| References | | |
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[Figure 1], [Figure 2], [Figure 3]
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