Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/342051
Type: DISSERTAÇÃO DIGITAL
Degree Level: Mestrado
Title: Influência do tratamento de superfície nas propriedades físicas e na formação de biofilme das cerâmicas à base de silicato de lítio reforçadas por zircônia : Influence of surface treatment on the physical properties and biofilm formation of zirconia-reinforced lithium silicate ceramics
Title Alternative: Influence of surface treatment on the physical properties and biofilm formation of zirconia-reinforced lithium silicate ceramics
Author: Shibasaki, Patricia Akemi Nishitani, 1988-
Advisor: Martins, Luís Roberto Marcondes, 1960-
Abstract: Resumo: Cerâmicas à base de silicato de lítio reforçadas com 8-12% de dióxido de zircônio (ZLS) para CAD/CAM foram desenvolvidas com o objetivo de fornecer um material com propriedades mecânicas e ópticas adequadas e facilidade de emprego, uma vez que algumas delas já são totalmente cristalizadas, necessitando apenas de polimento de superfície. Porém, existem poucos dados referentes às propriedades físicas e à formação de biofilme nesses materiais, em relação aos efeitos dos tratamentos de superfície e envelhecimento térmico. Objetivo: Esta pesquisa avaliou a rugosidade, morfologia, ângulo de contato, formação de biofilme multiespécie e a resistência à flexão das cerâmicas ZLS submetidas ao polimento, glazeamento ou nenhum tratamento de superfície, após envelhecimento por ciclagem térmica. Metodologia: Corpos de prova de cerâmicas ZLS (Celtra Duo/Dentsply Sirona e Vita Suprinity FC/Vita Zahnfabrik) e dissilicato de lítio (LD, IPS e-max CAD) foram obtidas e submetidas aos tratamentos: (GL) Glazeamento; (PL) Polimento com sistemas de pontas de borracha impregnada com partículas de diamante e (C) Controle - sem polimento. Após o tratamento de superfície, os corpos de prova foram envelhecidos com 18.000 ciclos térmicos (5° a 55° C +/1° C). A rugosidade média (Ra) e a morfologia foram avaliadas por meio de Microscópio de Força Atômica (AFM, n=5) e Microscópio Eletrônico de Varredura (MEV, n=5), respectivamente. O ângulo de contato da superfície das cerâmicas após polimento e envelhecimento foi determinada pelo goniômetro e a formação de biofilme multiespécie (Streptococcus mutans e Candida albicans), por espectrofotometria (n=5). A resistência mecânica das cerâmicas polidas e envelhecidas foi obtida pelo ensaio de resistência à flexão (n=10). Após a análise descritiva e exploratória, os dados foram submetidos à análise de variância (ANOVA) de dois fatores e teste Tukey, realizadas no programa R com nível de significância de 5%. Resultados: O polimento das cerâmicas com pontas de borracha impregnada com partículas de diamante promoveu menor rugosidade de superfície comparado ao glazeamento, a cerâmica ZLS Celtra Duo polida apresentou maior rugosidade que a LD polida (p<0,05). A superfície sem polimento (C) apresentou maior rugosidade do que o grupo polido (p<0,05), maior ângulo de contato e alterações da morfologia mais significativas. Qualquer que fosse o tratamento, o ângulo de contato foi maior no material Celtra Duo em relação aos demais. Qualquer que fosse o material, houve maior formação de biofilme na superfície das cerâmicas sem tratamento (C) comparadas às cerâmicas com polimento ou glazeamento, as quais não apresentaram diferenças entre si. Não houve diferença na resistência à flexão entre as cerâmicas, porém, a superfície sem tratamento (C) apresentou a menor resistência à flexão entre os grupos. Conclusão: As cerâmicas ZLS submetidas ao polimento com pontas de borracha impregnada com partículas de diamante apresentaram melhores resultados, com menor rugosidade e maior alteração da morfologia, pois deixou a superfície com menos irregularidades, porém formação de biofilme e resistência à flexão similares às cerâmicas glazeadas. No geral, as cerâmicas ZLS e dissilicato de lítio apresentaram resultados semelhantes, o que torna as ZLS uma boa opção restauradora indireta

Abstract: The zirconia reinforced lithium silicate ceramics presenting 8-12% of zirconia dioxide (ZLS) - for CAD/CAM systems were developed to provide a material with appropriate mechanical and optical properties and ease of use, as some of them are fully crystallized, requiring only surface polishing. However, there are few data regarding the physical and biofilm formation of these materials concerning the effects of surface treatments and thermal aging. Purpose: This research evaluated the roughness, surface morphology, contact angle, multispecies biofilm formation and flexural strength of ZLS ceramics submitted to the polishing, glazing or no surface treatment after thermal cycling aging Methodology: ZLS (Celtra Duo/Dentsply Sirona and Vita Suprinity FC/Vita Zahnfabrik) and lithium disilicate (LD, IPS e-max CAD) specimens with standard dimensions were subjected to the following treatments: (GL) Glazing; (PL) Polishing with rubber cups impregnated with crystallized diamond particles and (C) Control - without polishing. After surface treatment, the specimens were aged with 18,000 thermal cycles (5º to 55º C + /1º C). Average roughness (Ra) and morphology were evaluated by means of Atomic Force Microscope (AFM, n=5) and Scanning Eletron Microscope (SEM, n=5), respectively. The contact angle of ceramics surface after polishing and aging was determined by the goniometer and the formation of multispecies biofilm (Streptococcus mutans and Candida albicans), by spectrophotometry (n=5). The mechanical strength of the polished and aged ceramics was obtained by the flexural strength test (n=10). After the descriptive and exploratory analysis, data were submitted to two-way analysis of variance (ANOVA) and Tukey test, performed in the R program with a significance level of 5%. Results: Polishing with rubber cups promoted lower surface roughness compared to glazing, the ZLS Celtra Duo ceramic presented higher roughness than LD (p<0.05). The surface without polishing (C) presented higher roughness than the polished group (p<0.05), greater contact angle and significant morphologic changes. Regardless of the treatment, the contact angle was higher in the Celtra Duo material than the others. Regardless the material, there was higher biofilm formation on the surface of ceramics without treatment (C) compared to the ceramics polished with rubber cups impregnated with crystallized diamond particles or glazing, which exhibited no differences. There was no difference in flexural strength between the ceramics, but the surface without treatment (C) presented the lowest flexural strength among groups. Conclusion: ZLS ceramics submitted to polishing with rubber cups impregnated with crystallized diamond particles exhibited lower roughness and lower morphological surface alteration, but biofilm formation and flexural strength were similar to glazed ceramics. In general, the ZLS and lithium disilicate ceramics showed similar results, which makes the ZLS a good option for indirect restorationsThe zirconia reinforced lithium silicate ceramics presenting 8-12% of zirconia dioxide (ZLS) - for CAD/CAM systems were developed to provide a material with appropriate mechanical and optical properties and ease of use, as some of them are fully crystallized, requiring only surface polishing. However, there are few data regarding the physical and biofilm formation of these materials concerning the effects of surface treatments and thermal aging. Purpose: This research evaluated the roughness, surface morphology, contact angle, multispecies biofilm formation and flexural strength of ZLS ceramics submitted to the polishing, glazing or no surface treatment after thermal cycling aging Methodology: ZLS (Celtra Duo/Dentsply Sirona and Vita Suprinity FC/Vita Zahnfabrik) and lithium disilicate (LD, IPS e-max CAD) specimens with standard dimensions were subjected to the following treatments: (GL) Glazing; (PL) Polishing with rubber cups impregnated with crystallized diamond particles and (C) Control - without polishing. After surface treatment, the specimens were aged with 18,000 thermal cycles (5º to 55º C + /1º C). Average roughness (Ra) and morphology were evaluated by means of Atomic Force Microscope (AFM, n=5) and Scanning Eletron Microscope (SEM, n=5), respectively. The contact angle of ceramics surface after polishing and aging was determined by the goniometer and the formation of multispecies biofilm (Streptococcus mutans and Candida albicans), by spectrophotometry (n=5). The mechanical strength of the polished and aged ceramics was obtained by the flexural strength test (n=10). After the descriptive and exploratory analysis, data were submitted to two-way analysis of variance (ANOVA) and Tukey test, performed in the R program with a significance level of 5%. Results: Polishing with rubber cups promoted lower surface roughness compared to glazing, the ZLS Celtra Duo ceramic presented higher roughness than LD (p<0.05). The surface without polishing (C) presented higher roughness than the polished group (p<0.05), greater contact angle and significant morphologic changes. Regardless of the treatment, the contact angle was higher in the Celtra Duo material than the others. Regardless the material, there was higher biofilm formation on the surface of ceramics without treatment (C) compared to the ceramics polished with rubber cups impregnated with crystallized diamond particles or glazing, which exhibited no differences. There was no difference in flexural strength between the ceramics, but the surface without treatment (C) presented the lowest flexural strength among groups. Conclusion: ZLS ceramics submitted to polishing with rubber cups impregnated with crystallized diamond particles exhibited lower roughness and lower morphological surface alteration, but biofilm formation and flexural strength were similar to glazed ceramics. In general, the ZLS and lithium disilicate ceramics showed similar results, which makes the ZLS a good option for indirect restorations
Subject: Cerâmica odontológica
Projeto auxiliado por computador
Propriedades de superficie
Resistência à flexão
Language: Inglês
Editor: [s.n.]
Citation: SHIBASAKI, Patricia Akemi Nishitani. Influência do tratamento de superfície nas propriedades físicas e na formação de biofilme das cerâmicas à base de silicato de lítio reforçadas por zircônia: Influence of surface treatment on the physical properties and biofilm formation of zirconia-reinforced lithium silicate ceramics. 2020. 1 recurso online (42 p.) Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba, Piracicaba, SP.
Date Issue: 2020
Appears in Collections:FOP - Tese e Dissertação

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