2015, Number 1
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Rev Cubana Estomatol 2015; 52 (1)
Hereditary ectodermal dysplasia and Lyon hypothesis
Machado CCH, dos Anjos PML, dos Anjos PA, Villar BR, Carneiro AMS, Baffi DM
Language: Portugués
References: 15
Page: 79-86
PDF size: 201.28 Kb.
ABSTRACT
Introduction: ectodermal dysplasia refers to disorders that promote dysplasia or
aplasia structures and tissues derived from ectoderm. This condition is usually
inherited by recessive pattern with lincagem cross, taking their frequency and severity
more pronounced in men.
Objective: the aim was to report a case of Hereditary Ectodermal Dysplasia.
Case report: patient TVLV female, aged 25, leucoderma, which sought a private
radiology service in the city of João Pessoa, Paraíba, Brazil. It was reported by the
patient, his father, now deceased, was diagnosed with this syndrome. During the
extraoral examination, there was dryness of the lips and eyes, skin darkening in the
periocular region, hair thin and sparse. The patient did not reveal xerostomia or
episodes of hyperthermia. There was loss of vertical dimension, prominent forehead
and nails were normal. The clinical examination intrabucal, there was retention of
11 primary teeth and the absence of 19 permanent teeth. The partial oligodontia was
then confirmed by radiographic examination. The partial expression of syndromic
features can be explained by the Lyon hypothesis (X inactivation), with half of the X
chromosomes of patients expressing normal genes and half the abnormal gene.
Conclusions: it was recommended genetic counseling and regular visits to the dentist. It´s fundamental the diagnosis of this disorder for the odontologist even in
the cases of softening of signs and symptoms.
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