Estudo da adesão dentinária em restaurações realizadas com ionômero modificado por resina: influência de técnicas restauradoras e do preparo cavitário
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2004
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Universidade Estadual Paulista (Unesp)
Resumo
O objetivo deste trabalho foi avaliar a interação ocorrida entre um material ionomérico e o tecido dentinário, quando realizadas duas técnicas de preparo cavitário e diferentes tratamentos superficiais. Para tanto, foram utilizados 40 dentes decíduos cariados (n=10). Os preparos cavitários foram realizados pela técnica convencional, com instrumentos cortantes rotatórios ou pela técnica empregada no Tratamento Restaurador Atraumático (ART), com uso de instrumentos cortantes manuais. Para o condicionamento da superfície dentinária foram utilizados o ácido fosfórico a 37% e o poliacrílico a 12,5%. A restauração dos espécimes foi realizada com o cimento de ionômero de vidro modificado por resina Fuji II LC. O tratamento realizado em cada grupo foi: (1) curetas dentinárias + ácido fosfórico + Fuji II LC; (2) brocas + ácido fosfórico + Fuji II LC; (3) curetas dentinárias + ácido poliacrílico + Fuji II LC; (4) brocas + ácido poliacrílico + Fuji II LC. Após a descalcificação e inclusão em parafina, os espécimes foram seccionados, montados seqüencialmente em lâminas de vidro, corados pelo método de Brown & Brenn e analisados em microscópio óptico com ação de luz polarizada AXIOPHOT (ZEISS) a 400X de aumento. Os resultados foram analisados de forma quantitativa e qualitativa. Os testes estatísticos, Análise de variância a um critério e teste de Tukey ao nível de 5%, mostraram que em relação à área de interação dente-material restaurador, os espécimes do grupo IV não apresentaram formação de tags em tecido dentinário, enquanto que as demais combinações de agentes condicionadores e técnicas possibilitaram a formação de tags com comprimentos semelhantes. A análise qualitativa mostrou que ambos os grupos tratados pela técnica do ART, apresentaram uma superfície cavitária irregular, além de inúmeras colônias bacterianas ao longo de...
The objective of the present study was to analyze the interaction between a ionomeric material and dentinal tissue using two cavity preparation techniques and different surface treatments. For this purpose, 40 deciduous teeth (n = 10). Cavity preparation was performed with rotary cutting instruments by the standard technique or by the technique employed in atraumatic restorative treatment (ART) using manual cutting instruments. For conditioning of the dentinal surface 37% phosphoric acid and 12.5% polyacrylic acid were used. Restoration of the specimens was performed with Fuji II LC resin-modified glass ionomer cement, and the groups were submitted to the following treatments: (1) dentinal curettes + phosphoric acid + Fuji II LC; (2) burs + phosphoric acid + Fuji II LC; (3) dentinal curettes + polyacrylic acid + Fuji II LC; (4) burs + polyacrylic acid + Fuji II LC. After decalcification and paraffin embedding, the specimens were sectioned, mounted sequentially on glass slides, stained by the method of Brown and Brenn, and analyzed under an Axiophot (Zeiss) polarized light microscope. The results were analyzed quantitatively and qualitatively by analysis of variance and by the Tukey test. With respect to the interaction area between the tooth and restorative material, specimens of group 4 showed no formation of tags in dentinal tissue, whereas the other combinations of conditioning agents and techniques led to the formation of tags of similar lengths. Qualitative analysis showed an irregular cavity surface in the two groups treated by the ART technique, in addition to numerous bacterial colonies throughout the extension of the cavities. Formation of an interaction area between dentinal tissue and ionomeric material was observed in all groups, with this interaction being more regular and showing less variation in thickness in group 2.
The objective of the present study was to analyze the interaction between a ionomeric material and dentinal tissue using two cavity preparation techniques and different surface treatments. For this purpose, 40 deciduous teeth (n = 10). Cavity preparation was performed with rotary cutting instruments by the standard technique or by the technique employed in atraumatic restorative treatment (ART) using manual cutting instruments. For conditioning of the dentinal surface 37% phosphoric acid and 12.5% polyacrylic acid were used. Restoration of the specimens was performed with Fuji II LC resin-modified glass ionomer cement, and the groups were submitted to the following treatments: (1) dentinal curettes + phosphoric acid + Fuji II LC; (2) burs + phosphoric acid + Fuji II LC; (3) dentinal curettes + polyacrylic acid + Fuji II LC; (4) burs + polyacrylic acid + Fuji II LC. After decalcification and paraffin embedding, the specimens were sectioned, mounted sequentially on glass slides, stained by the method of Brown and Brenn, and analyzed under an Axiophot (Zeiss) polarized light microscope. The results were analyzed quantitatively and qualitatively by analysis of variance and by the Tukey test. With respect to the interaction area between the tooth and restorative material, specimens of group 4 showed no formation of tags in dentinal tissue, whereas the other combinations of conditioning agents and techniques led to the formation of tags of similar lengths. Qualitative analysis showed an irregular cavity surface in the two groups treated by the ART technique, in addition to numerous bacterial colonies throughout the extension of the cavities. Formation of an interaction area between dentinal tissue and ionomeric material was observed in all groups, with this interaction being more regular and showing less variation in thickness in group 2.
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Palavras-chave
Adesão, Dentina, Ionomeros, Ionômero modificado por resina, Dente decíduo, Tratamento restaurador atraumático, Dentin, Deciduous tooth, Atraumatic restorative treatment, Resin modified ionomer
Como citar
AFONSO, Rebeca Lima. Estudo da adesão dentinária em restaurações realizadas com ionômero modificado por resina: influência de técnicas restauradoras e do preparo cavitário. 2004. 123 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Odontologia de Araçatuba, 2004.