Histological Characteristics of Dentine in Permanent and Deciduous Teeth and their Clinic Significance. Preliminary Study.

According to the data obtained of the bibliography and the clinic experience we can say that currently the materials used for esthetics restorations on permanent teeth show very good adhesive properties to dental tissue.  Nevertheless this property is not  good enough to restorations of deciduous teeth. The aim of this study was to identify differences between the dentine of permanent teeth and of deciduous teeth in order to be able to understand the different behavior of the adhesive materials.  For this study 24 permanent premolars of patients from 14 to 18 years were studied, extracted by reasons of treatment, and 24 deciduous canines and incisors of patients from among 18 months and 8 years of age, 13 of them were avulsioned and 11 of them were extracted by reasons of treatment and under the consent reported.  None of the teeth studied  presented caries.  All teeth were fixed in 10% formalin, descalcified in EDTA, embedded in paraffin Bucco-lingual or buccopalatine sections were obtained and stained with hematoxilin-eosin.  Histological and histomorfometric studies were performed in order to determine the characteristics and the number of dentinal tubules per unit of volume, the wide one of the dentinal tubules and the wide one of intertubular dentine.  Our results showed that  deciduous teeth present more dentinal tubules per unit of volume being their wide  similar in both groups.  The wide of intertubular dentine found in  deciduous teeth was minor that in permanent teeth.  These results would be able to explain in part the difficulties of adhesion found in the treatment of the deciduous teeth, and will be the base of further studies.
Keywords: dentine, adhesion to dentine, dentinal tubules, primary teeth, permanent teeth.