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  • 1
    In: Brazilian Journal of Case Reports, Publicacoes Cientificas de Acesso Aberto e Editora LTDA, Vol. 3, No. Suppl.8 ( 2023-08-02), p. 42-
    Abstract: As cerâmicas vítreas de dissilicato de lítio, associadas à tecnologia computer aided design/computer aided manufacturing (CAD-CAM), destacam-se por suas propriedades mecânicas e otimização do processo restaurador. O glazeamento consiste em uma etapa laboratorial necessária para melhorar as propriedades de superfície nessas restaurações. Objetivou-se avaliar o efeito do número de camadas de glaze sobre uma cerâmica de dissilicato de lítio CAD-CAM, quanto à rugosidade de superfície (Ra), submetida à escovação (E), termociclagem (TC) ou associação (TCE), em baseline, 2.5, 5 e 10 anos. Foram distribuídos, aleatoriamente, 80 corpos de prova, em 2 grupos (40): 1 camada de glaze (GL1) e 2 camadas (GL2), subdivididos de acordo com a intervenção (E, TC, TCE, controle), seguindo ciclos de 40mil, 80mil e 160mil para E e 3mil, 6mil e 12mil ciclos para TC. A Ra foi avaliada com o auxílio de umperfilômetro de contato em todos os tempos. Os dados foram analisados por ANOVA (mista de 3 vias e 1 critério), pós-teste de Bonferroni e teste t (?=0,05). Verificou-se que o grupo GL1 teve maior rugosidade que GL2 (p & lt;0,05) no controle, E e TC; todavia, o valor de Ra foi igualado após TCE em todos os ciclos, bem como na TC 10 anos. Concluiu-se que o uso de 2 camadas de glaze proporcionou maior lisura ao dissilicato de lítio, porém simulando-se escovação associada a mudanças de temperatura no decorrer do tempo, o número de camadas não proporcionou diferenças na rugosidade de superfície.
    Type of Medium: Online Resource
    ISSN: 2763-583X
    Language: Unknown
    Publisher: Publicacoes Cientificas de Acesso Aberto e Editora LTDA
    Publication Date: 2023
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  • 2
    In: Journal of Prosthodontics, Wiley
    Abstract: To evaluate the effects of 1 versus 2 glaze firings on the color and mechanical properties of an extrinsically characterized lithium disilicate ceramic after thermal cycling, brushing, or both. Materials and Methods Eighty specimens were divided into 2 groups: 1 glaze firing (GL1) and 2 glaze firings (GL2). Each group was subdivided into 4 groups (n = 10), according to the experimental conditions: thermal‐cycling, brushing, thermal‐cycling + brushing, and immersion in distilled water (control). Color variation, surface roughness, and Vickers microhardness were analyzed before each designated experiment and after the simulated periods of 2.5, 5, and 10 years. Three‐way mixed ANOVA was used for all outcomes, followed by 1‐way ANOVA, repeated measures 1‐way ANOVA, Bonferroni post hoc test, and t‐ test to check for statistical differences (α = 0.05). Results Thermal cycling generated greater color changes in the GL1 group at 2.5 and 5 years ( p 〈 0.001; p = 0.013). Brushing generated color changes in GL1 at 5 years ( p = 0.003) and in GL2 at 10 years ( p = 0.017). Regarding surface roughness, the GL1 group suffered alterations in thermal cycling + brushing at 5 years. In the control group, the GL1 group exhibited higher roughness values than GL2 ( p 〈 0.05). Most of the groups experienced an increase in microhardness at 2.5 years ( p 〈 0.05). In the GL1 group, thermal‐cycling increased the microhardness at 5 years ( p = 0.006); at 5 and 10 years, the GL1 group had a higher microhardness than the GL2 in thermal‐cycling + brushing ( p 〈 0.05). Conclusion Ceramics with 1 glaze firing showed greater color, roughness, and microhardness changes compared to those submitted to 2 firings.
    Type of Medium: Online Resource
    ISSN: 1059-941X , 1532-849X
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 2053077-8
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