Compatibilidade biologica de resina resorcina-formaldeido quando aplicada sobre dentina em pre-molares humanos. Avaliação em microscopia optica e eletronica de transmissão

AUTOR(ES)
DATA DE PUBLICAÇÃO

1996

RESUMO

The purpose of this investigation was to evaluate the biological compatibility of a resorcin-formaldehyde resin when applied directly on dentin cavity floor. Thirty six healthy human premolars due to be extracted for orthodontic reasons were selected for the study. This sample was divided into three groups: in experimental group, class V cavities were prepared, lined with resorcin formaldehyde resin; in control group I, the cavities were lined with calcium hydroxide cements. The cavities were restored with amalgam; in control group 11, the remaining 6 prelomars were used as a negative control, having no treatment. The teeth were extracted at 7, 15, 30 and 120 days afier the placement of restorations and sections were obtained, stained with haematoxylin and eosin, Masson s Trichrome, with the Brown and Brenn technique for the identification of bacteria. The specimens were evaluated in O.M. and T.E.M. and histological observations showed at 7 day for experimental group, odontoblastic disappearance with aspiration into dentinal tubules, hidropic degeneration cells, hyalin alteration, necrosis and neutrophils in the region. At 15 and 30 days was" determined that the intensity of the reactions decreased with time, so at 120 days was observed the pulpal healing with reactional dentinal deposition. For the control group I the histological observation showed slight pulpal reaction at 7 days but in the others periods the pulpal tissue exibed normal characteristics, similar the teeth no treated for control group 11. This study showed neither a potential relationship between the intensity of the reactions and the thickness of the residual dentin nor between the intensity of reactions and the presence of bacteria on the cavity walls or into the dentinal tubules. The resorcin-formaldehyde resin, used as cavity liner, showed a significant pulpal reaction at 7 and 15 days. So, more "in vivo" and "in vitro" studies should be made to observe pulp reactions when resin is applied on enamel or cement

ASSUNTO(S)

resinas dentarias dentina polpa dentaria

ACESSO AO ARTIGO

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