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Influência do envelhecimento na microdureza de resinas CAD-CAM impressas
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Objetivo: Avaliar o efeito dos vários tipos de envelhecimento na microdureza de duas resinas impressas em três dimensões (3D) e uma resina convencional.
Materiais e Métodos: Foram produzidos espécimes com 25x2x2 mm de duas resinas impressas em 3D (Crown and Bridge MFH e VarseoSmile Crown Plus) e uma resina de fabrico convencional (Enamel Plus Temp) e submetidos, durante 30 dias, a quatro tipos de envelhecimento: em água, físico através de 1000 ciclos de flutuações térmicas (5-55ºC), em saliva artificial a pH=7 e, químico através de variações do pH em saliva artificial (a pH=3, 8h/dia e a pH=7, 16h/dia) (n=15). Após o envelhecimento a microdureza Knoop foi avaliada e os resultados analisados com testes Krustal- Wallis, seguidos de comparações múltiplas com testes de Mann-Whitney e correção de Bonferroni. Foi estabelecido um nível de significância de 5%.
Resultados: A resina VarseoSmile Crown Plus revelou microdureza significativamente maior (p<0,001) do que a resina Crown and Bridge MFH e Enamel Plus Temp. As diferenças na microdureza entre as duas últimas resinas mencionadas não foram consideradas estatisticamente significativas (p=1,00). De modo geral, os envelhecimentos afetaram negativamente a microdureza das resinas, sendo o envelhecimento químico o único envelhecimento que afetou todas as resinas. Para a resina Crown and Bridge MFH, o envelhecimento em saliva artificial e químico reduziu significativamente a microdureza (p<0,001). Para a resina VarseoSmile Crown Plus, a menor microdureza observou-se no envelhecimento químico, diferença estatisticamente significativa (p<0,05) quando comparado aos restantes grupos. Quanto à resina Enamel Plus Temp, os valores inferiores de microdureza foram observados nos espécimes com envelhecimento em água, em saliva artificial e químico, sem diferença estatisticamente significativa (p>0,05) entre eles.
Conclusão: No geral, a microdureza foi influenciada pelo tipo de resina e pelo tipo de envelhecimento realizado.
Objective: To evaluate the effect of several types of aging on the microhardness of two 3D-printed resins and one conventional resin. Materials and Methods: Specimens measuring 25x2x2 mm were produced from two 3D-printed resins (Crown and Bridge MFH and VarseoSmile Crown Plus) and one conventional resin (Enamel Plus Temp) and subjected to four types of aging for 30 days: water, physical aging through 1,000 cycles of thermal fluctuations (5-55°C), in artificial saliva at pH=7, and chemical aging through pH variations in artificial saliva (at pH=3, 8h/day and at pH=7, 16h/day) (n=15). After aging, Knoop microhardness was evaluated and the data were analyzed with Kruskal-Wallis tests, followed by multiple comparisons with the Mann-Whitney tests with Bonferroni correction. A significance level of 5% was established. Results: VarseoSmile Crown Plus resin exhibited significantly higher microhardness (p < 0.001) than Crown and Bridge MFH and Enamel Plus Temp resins. The differences in microhardness between the latter two resins were not considered statistically relevant (p = 1.00). In general, aging negatively affected the microhardness of the resins, with chemical aging being the only aging type that affected all resins. For the resin Crown and Bridge MFH, aging in artificial saliva and chemical aging significantly reduced microhardness (p<0.001). For the resin VarseoSmile Crown Plus, the lowest microhardness was observed in the chemical aging group, a statistically significant difference (p<0.05) compared to the other groups. Regarding the resin Enamel Plus Temp, lower microhardness values were observed in specimens subjected to aging in water, artificial saliva, and chemical aging, with no statistically significant difference (p>0.05) among them. Conclusion: Overall, microhardness was influenced by the type of resin and the type of aging applied.
Objective: To evaluate the effect of several types of aging on the microhardness of two 3D-printed resins and one conventional resin. Materials and Methods: Specimens measuring 25x2x2 mm were produced from two 3D-printed resins (Crown and Bridge MFH and VarseoSmile Crown Plus) and one conventional resin (Enamel Plus Temp) and subjected to four types of aging for 30 days: water, physical aging through 1,000 cycles of thermal fluctuations (5-55°C), in artificial saliva at pH=7, and chemical aging through pH variations in artificial saliva (at pH=3, 8h/day and at pH=7, 16h/day) (n=15). After aging, Knoop microhardness was evaluated and the data were analyzed with Kruskal-Wallis tests, followed by multiple comparisons with the Mann-Whitney tests with Bonferroni correction. A significance level of 5% was established. Results: VarseoSmile Crown Plus resin exhibited significantly higher microhardness (p < 0.001) than Crown and Bridge MFH and Enamel Plus Temp resins. The differences in microhardness between the latter two resins were not considered statistically relevant (p = 1.00). In general, aging negatively affected the microhardness of the resins, with chemical aging being the only aging type that affected all resins. For the resin Crown and Bridge MFH, aging in artificial saliva and chemical aging significantly reduced microhardness (p<0.001). For the resin VarseoSmile Crown Plus, the lowest microhardness was observed in the chemical aging group, a statistically significant difference (p<0.05) compared to the other groups. Regarding the resin Enamel Plus Temp, lower microhardness values were observed in specimens subjected to aging in water, artificial saliva, and chemical aging, with no statistically significant difference (p>0.05) among them. Conclusion: Overall, microhardness was influenced by the type of resin and the type of aging applied.
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Teses de mestrado - 2024 Saúde Oral