Monozygotic triplets with discordance for some traits

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Abstract
The results of a clinical, occlusal and radiographic study of three monozygotic male triplets aged seven years nine months, showed they all had concordance, or a very high degree of similarity, with respect to incompetent lips, class II division 1 malocclusion, bi-maxillary protrusion, deep overbite and the development of the third molars. One of the triplets, however, had a complete unilateral crossbite on the right side due to a pronounced buccal inclination of the upper deciduous molars and the first permanent molar together with a lingual inclination of the corresponding lower teeth. Two of the triplets had mirror image congenital absence of one of the lower second premolars although they were all present in the third child. This discordance for missing premolars could be due to a gene mutation during the process of gene recombination or to a difference in gene expressivity. However, the abnormal inclination of the upper and lower molars which caused the unilateral crossbite could not be satisfactorily explained.

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