Efeito de diferentes tratamentos de superfície sobre a resistência de união de cerâmicas odontológicas
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Data
2020-07-28
Autores
Brunetto, Juliana Lujan [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Os objetivos deste estudo foram caracterizar a superfície das cerâmicas para sistema CAD/CAM (F-Feldspática, S-Silicato de lítio reforçado por zircônia e Z-Zircônia de média translucidez) após diferentes pré-condicionamentos de superfície para cimentação aplicados separadamente ou combinados; e avaliar a resistência de união por microtração (RUM) e padrões de fratura (PF) entre as cerâmicas (F, S e Z) após pré-condicionamentos de superfície e o cimento resinoso. Foram confeccionados 150 blocos 5x5x2(±0,5)mm para análise topográfica (n=10) e 240 blocos (5×5×6(±0,5)mm) (n=8) para análise da resistência de união, divididos em 05 grupos de acordo com tipo de cerâmica, pré-condicionamento de superfície e testes realizados: (AF) condicionamento com ácido fluorídrico 10%; (AF+PC) condicionamento de com ácido fluorídrico 10% + aplicação de primer cerâmico universal (Monobond N); (PA) aplicação de primer cerâmico autocondicionante de passo único (Monobond Etch & Prime); (JT+PA) jateamento com Al2O3 revestido por SiO2 (CoJet™) + aplicação de primer cerâmico autocondicionante de passo único e (JT+PC) jateamento com Al2O3 revestido por SiO2 (CoJet™) + aplicação de PC. As análises topográficas foram realizadas após os diferentes pré-condicionamentos. A RUM e padrão de fratura foram realizadas após 24 horas de armazenagem em água ou após termociclagem. Para as análises topográficas, foi realizado a análise de variância (ANOVA - dois fatores) seguido pelo teste de Tukey (α = 0,05). Para o teste de RUM a estatística foi realizada pela análise de variância (ANOVA para medidas repetidas) sob três fatores e teste de Bonferroni (α = 0,05). Os pré-condicionamentos de superfície que usaram a combinação com jateamento apresentaram maiores valores de Ra. A ELS das cerâmicas foi influenciada pelos pré-condicionamentos, aonde JT+PC apresentou os maiores valores em F e Z. A KHN alterada penas na cerâmica Z, com um aumento significativo (p<0,05) após jateamentos (JT+PC e JT+PA). Para cerâmica F, os grupos tratados com jateamento e primers (JT+PC e JT+PA) apresentaram valores de RUM superiores aos demais tratamentos. Para cerâmica à base de S com exceção do tratamento com AF isolado, que mostrou baixo valor de RUM, todos os outros pré-concidionamentos apresentaram altos valores de RUM, sem diferença significante entre eles (p> 0,05). Para Z de média translucidez não houve diferença significativa entre os tratamentos JT+PC e JT+PA que obtiveram os maiores valores de RUM. A termociclagem reduziuos valores de RUM, com exceção da cerâmica de S condicionada com JT+PC Quanto ao padrão de fratura, pode-se observar que em todos os grupos houve predominância de falhas adesivas (superior a 70%), independente da termociclagem. Conclui-se que os pré-condicionamentos influenciaram na topografia estrutural e na RUM de todas as cerâmicas. O primer cerâmico autocondicionante de passo único (PA) pode ser uma alternativa viável ao uso de Ácido fluorídrico 10% + primer cerâmico universal (AF + PC) na cerâmica feldspática (F) e, ao jateamento com Al2O3 revestido por SiO2 + primer cerâmico universal (JT + PC) na cerâmica silicato de lítio reforçado por zircônia (S) e na zircônia de média translucidez (Z).
The objectives of this study were to characterize the ceramics surface for CAD / CAM system after different surface preconditions for cementation applied separately or combined; and to evaluate the microtensile bond strength (RUM) and fracture patterns (PF) between the ceramics (F, S and Z ) after surface preconditioning and the resin cement after aging. 150 5x5x2 (± 0.5) mm blocks were made for characterization analysis (n = 10) and 240 blocks (5 × 5 × 6 (± 0.5) mm) (n = 8) for bond strength analysis, divided in 05 groups according to type of ceramic, surface preconditioning and tests performed: (AF) conditioning with 10% hydrofluoric acid; (AF + PC) conditioning with 10% hydrofluoric acid + application of universal ceramic primer (Monobond N); (PA) application of single-step self-etching ceramic primer (Monobond Etch & Prime); (JT + PA) blasting with SiO2-coated Al2O3 (CoJet ™) + application of single-step self-etching ceramic primer and (JT + PC) blasting with Al2O3 coated with SiO2 (CoJet™) + PC application The surface characterization analyzes were performed after the different preconditionings. The RUM and fracture pattern were performed after 24 hours of storage in water or after thermocycling. For topographic analysis, ANOVA (two factors) was performed followed by the Tukey test (α = 0.05). For the RUM test, statistics were performed by analysis of variance (ANOVA for repeated measures) under three factors and Bonferroni test (α = 0.05). The surface preconditions that used the combination with blasting showed higher values of Ra. The ELS of ceramics was influenced by the preconditionings, where JT + PC presented the highest values in F and Z. The altered KHN feathers in ceramic Z, with a significant increase (p <0.05) after blasting (JT + PC and JT + PA). For ceramics F, the groups JT + PC and JT + PA showed RUM values higher than the other treatments. For S with the exception of treatment with isolated AF, which showed a low RUM value, all other preconditions were found to have high RUM values, with no significant difference between them (p> 0.05). For Z, there was no significant difference between the treatments JT + PC and JT + PA that obtained the highest RUM values. Thermocycling reduced the values, with the exception of S ceramics conditioned with JT + PC. Regarding the fracture pattern, it can be observed that in all groups there was a predominance of adhesive failures (over 70%), regardless of thermocycling. It is concluded that the pre-conditioning influenced the structural characterization and the RUM of all ceramics. The single-step self-etching ceramic primer (PA) can be a viable alternative to the use of 10% hydrofluoric acid + universal ceramic primer (AF + PC) in feldspar ceramic (F) and, when blasting with Al2O3 coated with SiO2 + universal ceramic primer (JT + PC) in zirconia-reinforced lithium silicate ceramics (S) and medium translucency zirconia (Z).
The objectives of this study were to characterize the ceramics surface for CAD / CAM system after different surface preconditions for cementation applied separately or combined; and to evaluate the microtensile bond strength (RUM) and fracture patterns (PF) between the ceramics (F, S and Z ) after surface preconditioning and the resin cement after aging. 150 5x5x2 (± 0.5) mm blocks were made for characterization analysis (n = 10) and 240 blocks (5 × 5 × 6 (± 0.5) mm) (n = 8) for bond strength analysis, divided in 05 groups according to type of ceramic, surface preconditioning and tests performed: (AF) conditioning with 10% hydrofluoric acid; (AF + PC) conditioning with 10% hydrofluoric acid + application of universal ceramic primer (Monobond N); (PA) application of single-step self-etching ceramic primer (Monobond Etch & Prime); (JT + PA) blasting with SiO2-coated Al2O3 (CoJet ™) + application of single-step self-etching ceramic primer and (JT + PC) blasting with Al2O3 coated with SiO2 (CoJet™) + PC application The surface characterization analyzes were performed after the different preconditionings. The RUM and fracture pattern were performed after 24 hours of storage in water or after thermocycling. For topographic analysis, ANOVA (two factors) was performed followed by the Tukey test (α = 0.05). For the RUM test, statistics were performed by analysis of variance (ANOVA for repeated measures) under three factors and Bonferroni test (α = 0.05). The surface preconditions that used the combination with blasting showed higher values of Ra. The ELS of ceramics was influenced by the preconditionings, where JT + PC presented the highest values in F and Z. The altered KHN feathers in ceramic Z, with a significant increase (p <0.05) after blasting (JT + PC and JT + PA). For ceramics F, the groups JT + PC and JT + PA showed RUM values higher than the other treatments. For S with the exception of treatment with isolated AF, which showed a low RUM value, all other preconditions were found to have high RUM values, with no significant difference between them (p> 0.05). For Z, there was no significant difference between the treatments JT + PC and JT + PA that obtained the highest RUM values. Thermocycling reduced the values, with the exception of S ceramics conditioned with JT + PC. Regarding the fracture pattern, it can be observed that in all groups there was a predominance of adhesive failures (over 70%), regardless of thermocycling. It is concluded that the pre-conditioning influenced the structural characterization and the RUM of all ceramics. The single-step self-etching ceramic primer (PA) can be a viable alternative to the use of 10% hydrofluoric acid + universal ceramic primer (AF + PC) in feldspar ceramic (F) and, when blasting with Al2O3 coated with SiO2 + universal ceramic primer (JT + PC) in zirconia-reinforced lithium silicate ceramics (S) and medium translucency zirconia (Z).
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Cerâmica, Projeto Auxiliado por Computador, Cimentação, Ceramics, Cimentation