The supplemental tooth in one of monozygotic twingirls– case repor
Journal Title: Forum Ortodontyczne - Year 2014, Vol 10, Issue 1
Abstract
Hyperdontia occurs when in addition to the regular number of teeth there is one or more supernumerary teeth. Hyperdontia is significantly more prevalent in deciduous dentition than in permanent dentition. If a supplemental deciduous tooth occurs, hyperdontia in permanent dentition should be expected in certain cases as well. The etiology of this phenomenon has not been explained yet – it is associated i.a. with such theories as the hyperactivity of the dental lamina, the atavistic theory, the theory of dichotomy of the tooth bud, the inheritance or vascular theory. Due to the fact that the occurrence of supplemental teeth may result in negative consequences to the health condition of the oral cavity, the usual treatment methods are extraction and orthodontic procedures, even though retention of such teeth might be considered as well. The literature presents cases of hyperdontia in both siblings born from a monozygotic pregnancy; however, the presence of a supplemental tooth in only one of monozygotic twins is a rare phenomenon. [b]Aim. [/b]The aim of this study is to present a case of monozygotic twins, one of whom has a supplemental deciduous incisor in the mandible. [b]Material and methods[/b]. A medical history of the twin girls was taken and their physical examination was conducted. Extraoral and intraoral photographs were taken. [b]Results [/b]and conclusions. In one of the twins, the supplemental tooth had a normal morphology and its shape resembled the first mandibular deciduous incisor. The tooth is located in the vestibular side slightly off the dental arch but without causing any orthodontic or clinical symptoms. The occurrence of a supernumerary tooth in one of monozygotic twins may represent evidence that a genetic factor is not the only agent responsible for the formation of supplemental teeth and that in the DNA of monozygotic twins, despite a considerable genetic similarity, certain differences take place that may result in significant differences in the dentition of both siblings. (Pietrak J, Maślanko M, Pels E, Gromadzka K, Błaszczak J, Wójtowicz W, Mielnik-Błaszczak M. The A supplemental tooth in one of monozygotic twingirls – case report. Orthod Forum 2014; 10: 47-53) Received 25.09.2013 Accepted 12.03.2014
Authors and Affiliations
Justyna Pietrak, Monika Maślanko, Elżbieta Pels, Ktarzyna Gromadzka, Jerzy Błaszczak, Wioleta Wójtowicz, Maria Mielnik-Błaszczak,
Keywords
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