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Effect of chlorhexidine loading on shear bond strength and surface free energy of acrylic reline resins after thermal ageing

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Resumo:Loading acrylic reline resins with chlorhexidine has been proposed as an alternative treatment for Denture Stomatitis. The main goal of this study was to evaluate the influence of loading three acrylic reline resins, namely, Kooliner, Ufi Gel Hard and Probase Cold, with different concentrations of chlorhexidine (CHX) in terms of their shear bond strength and surface free energy after undergoing a thermal ageing process. Shear bond strength test was conducted resorting to a universal testing machine Instron, with 1kN load cell and crosshead speed of 1mm/min, with specimens of acrylic reline resins loaded with specific proportions of CHX linked to the denture base resin (n=10), after submitted to a thermal process that simulates ageing inside the oral cavity. Surface free energy was assessed resorting to specimens of acrylic reline resins loaded with specific percentages of CHX (n=7). Specimens were subjected to water and 1,2-propanediol to assess contact angles by the Wilhelmy plate technique, which allows the estimation of surface free energy values through the Wu method. Results were submitted to nonparametric tests according to the Kruskal-Wallis method, followed by multiple comparisons using Mann-Whitney tests with Bonferroni corrections, being considered the 5% level of significance (α=0.05). No differences in shear bond strength were observed when experimental Kooliner and Ufi Gel Hard groups where compared to control. Yet, 5% CHX Probase Cold group presented lower values than the control. In surface free energy test, statistical differences were not observed between groups of each material. In conclusion, after a thermal ageing procedure, loading CHX had no influence on shear bond strength of Kooliner and Ufi Gel Hard groups but a negative influence on Probase Cold on 5% CHX specimens. Loading chlorhexidine did not affected the surface free energy of all acrylic reline resins.
Autores principais:Costa, Natália Alexandra Gonçalves da
Assunto:Saúde oral Resinas acrílicas Clorexidina Teses de mestrado - 2018
Ano:2018
País:Portugal
Tipo de documento:dissertação de mestrado
Tipo de acesso:acesso aberto
Instituição associada:Universidade de Lisboa
Idioma:inglês
Origem:Repositório da Universidade de Lisboa

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