Variation of dentin dysplasia type I: report of atypical findings in the permanent dentition.

[dentin dysplasia]

Dentin dysplasia is a rare defect of dentin development with an autosomal dominant pattern of inheritance , which is generally divided into 2 main classes based on the clinical and radiographic appearance of the affected dental tissues : type I , which affects the root portion and type II , which affects the coronal portion of the tooth . This paper reports the case of a child aged 10 years and 8 months with both classic and atypical features of dentin dysplasia type I in the permanent dentition . Only few mandibular teeth were affected and presented clinically normal appearing crowns , moderate to severe mobility , short , blunt or almost absent roots . However , no evidence of pulp chamber obliteration or periapical radiolucencies was found . The clinical and radiographic characteristics observed in this patient are different from those reported in the literature , which suggests that this may be a variation of dentin dysplasia type I expression .