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Análise da interface adesiva formada entre dentina erodida e um sistema adesivo funcional, no imediato e após envelhecimento
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Abstract(s)
Objetivos: Comparar a interface adesiva de um novo adesivo funcional em dentina erodida com uma estratégia gold-standard, com recurso a testes de microtração (μTBS), nanodureza (GPa) e módulo de elasticidade reduzido (GPa).
Materiais e Métodos: Foram distribuídos aleatoriamente por 4 grupos experimentais, 44 molares permanentes humanos hígidos, todos sujeitos a erosão artificial com ácido cítrico (0.05M; 3x por dia, 5 dias). Os grupos
incluíram o controlo Clearfil SE Bond 2 (CFSE) e um grupo experimental Clearfil SE Protect (CFP), em dois tempos diferentes – ao imediato (24h) e a longo prazo (3 meses – 3M). As amostras foram seccionadas em
microespécimes para μTBS (n=8) e em fatias transversais de 2 mm para os ensaios de nanoindentação (n=3). Os grupos CFSE_3M e CFP_3M foram armazenados em saliva artificial. A análise estatística contemplou o teste ANOVA two-way para os resultados de μTBS, enquanto que os resultados de dureza/módulo de elasticidade foram analisados com recurso a um teste de Kruskal-Wallis (nível de significância de 5%, SPSS v.27.0).
Resultados: Embora não se tenham verificado diferenças significativas nos valores de μTBS entre os grupos testados, tanto a curto (24 h) como longo prazo (3 meses) (p>0,05), foi observada uma tendência crescente no grupo CFP_3M nos testes de microtração. Em relação aos testes de dureza, não foram observadas diferenças na camada híbrida, entre as duas variáveis (p=0.05), enquanto o módulo de elasticidade reduzido aumentou no grupo CFP_3M comparado com CFP_24.
Conclusão: O adesivo CFP demonstrou resistência adesiva e propriedades mecânicas semelhantes ao CFSE, com potencial de reforço e remineralização da interface erodida. Esta estratégia poderá ser promissora a longo prazo.
Introduction: To compare the adhesive interface in eroded dentin, formed by a functional dental adhesive and a gold standard strategy, by testing microtensile bond strength (μTBS), hardness and elastic modulus. Materials and Methods: Permanent sound human molars were randomly allocated to 4 experimental groups, all subject to artificial erosion (0.05 M citric acid; 3x daily, 5 days). Groups included control Clearfil SE Bond 2 (CFSE) and experimental group Clearfil SE Protect (CFP), in two different times - immediate (24h) and long-term (3 months – 3M). Samples were sectioned into microspecimens for μTBS testing (n=8) and into 2-mm thick slabs for nanoindentation assays (n=3). Groups CFSE_3M and CFP_3M were stored in artificial saliva. The statistical analysis included two-way ANOVA for μTBS results, while hardness/modulus were analyzed using Kruskal-Wallis H Test (significance level of 5%; SPSS v.27.0). Results: Although there were no significant differences in μTBS values, between adhesives or at different points in time – both short (24 h) and long term (3 months) - a positive trend, with μTBS rising in the CFP_3M group was observed (p>0.05). Regarding hardness, no specific differences were seen in the hybrid layer, between the two variables (p>0.05), while the reduced elastic modulus rose in CFP_3M compared to 24h. Conclusion: Thus, CFP shows similar bond strength results and nanomechanical properties to CFSE in eroded dentin, although it may comprise promising long-term results.
Introduction: To compare the adhesive interface in eroded dentin, formed by a functional dental adhesive and a gold standard strategy, by testing microtensile bond strength (μTBS), hardness and elastic modulus. Materials and Methods: Permanent sound human molars were randomly allocated to 4 experimental groups, all subject to artificial erosion (0.05 M citric acid; 3x daily, 5 days). Groups included control Clearfil SE Bond 2 (CFSE) and experimental group Clearfil SE Protect (CFP), in two different times - immediate (24h) and long-term (3 months – 3M). Samples were sectioned into microspecimens for μTBS testing (n=8) and into 2-mm thick slabs for nanoindentation assays (n=3). Groups CFSE_3M and CFP_3M were stored in artificial saliva. The statistical analysis included two-way ANOVA for μTBS results, while hardness/modulus were analyzed using Kruskal-Wallis H Test (significance level of 5%; SPSS v.27.0). Results: Although there were no significant differences in μTBS values, between adhesives or at different points in time – both short (24 h) and long term (3 months) - a positive trend, with μTBS rising in the CFP_3M group was observed (p>0.05). Regarding hardness, no specific differences were seen in the hybrid layer, between the two variables (p>0.05), while the reduced elastic modulus rose in CFP_3M compared to 24h. Conclusion: Thus, CFP shows similar bond strength results and nanomechanical properties to CFSE in eroded dentin, although it may comprise promising long-term results.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Adesivo funcional Dentina erodida Propriedades mecânicas Resistência adesiva