The aim of this study was to evaluate the effect of different commercial silanes on microshear bond strength of resin cement to lithium disilicate ceramic. Twenty ceramic samples with 10 mm in length, 10 mm wide and 3 mm in thickness were fabricated, etched with 10% hydrofluoric acid for 20 seconds,...

The aim of this study was to evaluate the effect of different commercial silanes on microshear bond strength of resin cement to lithium disilicate ceramic. Twenty ceramic samples with 10 mm in length, 10 mm wide and 3 mm in thickness were fabricated, etched with 10% hydrofluoric acid for 20 seconds, and divided into 5 groups, according to the commercial silane applied: G1- RelyX Ceramic Primer (3M ESPE), G2- Angelus Silane, G3- Prosil (FGM), G4- Dentsply Silane (Dentsply) and G5- Bis-Silane (Bisco). Silanes were applied in accordance to manufacturers' recommendations. Addition silicone molds with 1 mm in thickness, 10 mm in diameter and 3 perforations with 1 mm in diameter each one, were placed on ceramic and filled with the resin cement RelyX ARC (3M ESPE) in all groups. Light activation was performed with LED Bluephase G2 (Ivoclar Vivadent) at 1200 mW/cm(2), for 30 seconds. Samples were maintained in 100% humidity at 37 degrees C for 24 hours and submitted to microshear test. The data (MPa) were submitted to one-way ANOVA and Tukey test (alpha=0.05). The results obtained for each group were: G1: 22.39 +/- 2.99; G2: 23.35 +/- 4.08; G3: 26.05 +/- 5.46; G4: 18.56 +/- 4.09; G5: 25.26 +/- 4.10. Statistical analysis showed significantly lower microshear bond strength for G4. Fracture pattern analysis showed predominance of adhesive failures in G1 and G2. G3 and G5 presented higher percentage of cohesive failures in ceramic, and G4 showed mixed, adhesive and cohesive fractures with similar percentages. It was concluded that different silanes showed influence on the lithium disilicate ceramic - resin cement bond strength

O objetivo neste estudo foi avaliar o efeito de diferentes silanos comerciais na resistência de união ao microcisalhamento do cimento resinoso à cerâmica de dissilicato de lítio. Foram confeccionadas 20 amostras de cerâmica (10mm de comprimento, 10mm de largura e 3mm de espessura), condicionadas com...

O objetivo neste estudo foi avaliar o efeito de diferentes silanos comerciais na resistência de união ao microcisalhamento do cimento resinoso à cerâmica de dissilicato de lítio. Foram confeccionadas 20 amostras de cerâmica (10mm de comprimento, 10mm de largura e 3mm de espessura), condicionadas com ácido fluorídrico a 10% por 20 segundos e divididas em 5 grupos, de acordo com o silano aplicado: G1- RelyX Ceramic Primer (3M ESPE), G2- Silano Angelus, G3-Prosil (FGM), G4- Silano Dentsply e G5-Bis-Silane (Bisco). Matrizes de silicone por adição (1 mm de espessura, 10 mm de diâmetro e 3 perfurações com 1 mm de diâmetro) foram colocadas sobre a cerâmica e preenchidas com cimento resinoso RelyX ARC (3M ESPE). A fotoativação foi realizada com LED Bluephase G2 (Ivoclar Vivadent) a 1200 mW/cm2, por 30 segundos. As amostras foram mantidas em 100% de umidade a 37°C por 24 horas e submetidas ao teste de microcisalhamento. Os dados (MPa) (G1: 22,39+2,99; G2: 23,35+4,08; G3: 26,05+5,46; G4: 18,56+ 4,09; G5: 25,26+4,10) foram submetidos a análise de variância e ao teste de Tukey (p<0,05). A análise estatística mostrou valor de resistência de união significantemente menor para G4. A análise do padrão de fratura mostrou predominância de falha adesiva para G1 e G2. G3 e G5 apresentaram maior porcentagem de falha coesiva em cerâmica, e o G4 apresentou fraturas mista, adesiva e coesiva em igual porcentagem. Concluiu-se que os diferentes silanos apresentaram influência na resistência de união do cimento resinoso à cerâmica de dissilicato de lítio.PALAVRAS-CHAVE: Silanos. Cerâmica. Cimentação. Resistência ao Cisalhamento. REFERENCES ATTIA, A. Influence of surface treatment and cyclic loading on the durability of repaired all-ceramic crowns. J Appl Oral Sci, v. 18, n. 2, p. 194-200, Mar-Apr. 2010. https://doi.org/10.1590/S1678-77572010000200015 ATTIA, A. Bond strength of three luting agents to zirconia ceramic - influence of surface treatment and thermocycling. J Appl Oral Sci, v. 19, n. 4, p.388-395, Aug. 2011. https://doi.org/10.1590/S1678-77572011005000015 BARGHI, N. To silanate or not silanate: making a clinical decision. Compend Contin Educ Dent, v. 21, n. 8, p. 659-662, Aug. 2000. BORGES, G. A.; SPOHR, A. M.; GOES, M. F.; SOBRINHO, L. C.; CHAN, D. C. N. Effect of etching and airborne particle abrasion on the microstructure of different dental ceramics. J Prosthet Dent, v. 89, n. 5, p. 479-488, May. 2003. https://doi.org/10.1016/S0022-3913(02)52704-9 CARVALHO, R. F.; MARTINS, M. E.; DE QUEIROZ, JR.; LEITE, F. P.; ÖZCAN, M. Influence of silane heat treatment on bond strength of resin cement to a feldspathic ceramic. Dent Mater, v. 30, n. 3, p. 392-397, May. 2011. https://doi.org/10.4012/dmj.2010-137 GARBOZA, C. S.; BERGER, S. B.; GUIRALDO, R. D.; EUGOLIN, A. P.; GONINI-JÚNIOR ,A.; MOURA, S. K.; LOPES,M. B. Influence of surface treatments and adhesive systems on lithium disilicate microshear bond strength. Braz Dent J, v. 27, n. 4, p. 458-462, Jul-Aug. 2016. https://doi.org/10.1590/0103-6440201600624 HOOSHMAND,T.; VAN NOORT, R.; KESHVAD, A. Bond durability of the resin bonded and silane treated ceramic surface. Dent Mater, v. 18, n. 2, p. 179-188, Mar. 2002. https://doi.org/10.1016/S0109-5641(01)00047-1 KAIMAL, A.; RAMDEV, P.; SHRUTHI, C. S. Evaluation of effect of zirconia surface treatment, using plasma of argon and silane, on the shear bond strength of two composite resin cements

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