RESUMO
The subject of this study was to observe the rat subcutaneous connective tissue reaction to implanted dentin tubes filled with mineral trioxide aggregate, Portland cement or calcium hydroxide. The animals were sacrificed after 7 or 30 days and the undecalcified specimens were prepared for histological analysis with polarized light and Von Kossa technique for mineralized tissues. The results were similar for the studied materials. At the tube openings, there were Von Kossa-positive granules that were birefringent to polarized light. Next to these granulations, there was an irregular tissue like a bridge that was Von Kossa-positive. The dentin walls of the tubes exhibited in the tubules a structure highly birefringent to polarized light, usually like a layer and at different depths. The mechanism of action of the studied materials has some similarity.
Assuntos
Compostos de Alumínio/farmacologia , Compostos de Cálcio/farmacologia , Hidróxido de Cálcio/farmacologia , Cimentos Dentários/farmacologia , Dentina Secundária/induzido quimicamente , Dentina/efeitos dos fármacos , Óxidos/farmacologia , Silicatos/farmacologia , Pele/patologia , Animais , Núcleo Celular/ultraestrutura , Corantes , Tecido Conjuntivo/patologia , Dentina/patologia , Dentina Secundária/patologia , Combinação de Medicamentos , Fibroblastos/patologia , Corantes Fluorescentes , Células Gigantes/patologia , Humanos , Microscopia de Polarização , Neutrófilos/patologia , Ratos , Fatores de TempoRESUMO
The natal teeth are defined as the presence of teeth at birth and the etiology is rather obscure. Clinically, the teeth show normal size and shape, although they reveal an immature appearance. The histological aspect show enamel with the possibility of presenting normal mineralization or being hypoplastic. The dentin may show alterations. The incidence of natal teeth varies greatly, with a predisposition for the female sex. This paper relates a case report of two partially erupted natal teeth in a female baby 9 days-old. The presence of teeth made the parents anxious. In their mind, that meant the child was abnormal. On the radiograph the erupted teeth showed little radio-opacity, without a radicular formation. The therapy utilized was the keeping of the teeth and a periodic monitoring, cleaning and daily topical applications sodium fluoride. The case was monitored by monthly consultations. At 9 months of age the primary central lower did not present mobility. On the radiograph examination incomplete radicular formation was observed.
