Camila Moreira Lima1, Nathalia Ramos da Silva2, Jordana Dias Martins3, Jean Soares Miranda4, Ricardo Tanaka5, Rodrigo Othávio de Assunção E Souza6, Fabíola Pessôa Pereira Leite7. 1. Federal University of Juiz de Fora (UFJF), Dental School, St. José Lourenço Kelmer, s/n - São Pedro, Juiz de Fora, MG, CEP: 36036-900, Brazil. Electronic address: camila_moreira21@hotmail.com. 2. Federal University of Rio Grande do Norte (UFRN), Department of Dentistry, Av. Salgado Filho, 1787 - Lagoa Nova, Natal, RN, CEP: 59056-000, Brazil. Electronic address: nathrds89@gmail.com. 3. Federal University of Juiz de Fora (UFJF), Dental School, St. José Lourenço Kelmer, s/n - São Pedro, Juiz de Fora, MG, CEP: 36036-900, Brazil. Electronic address: jordana.d.martins@hotmail.com. 4. Braz Cubas University, Department of Dentistry, Av. Francisco Rodrigues Filho, 1233 - Vila Mogilar, Mogi das Cruzes, SP, CEP: 08773-380, Brazil. Electronic address: jeansoares@msn.com. 5. University of São Paulo (USP), Dental School, St. João de Santa Maria, 129 - Vila Brasilina, São Paulo, SP, CEP: 04158-070, Brazil. Electronic address: ricardo@tnklab.com.br. 6. Federal University of Rio Grande do Norte (UFRN), Department of Dentistry, Av. Salgado Filho, 1787 - Lagoa Nova, Natal, RN, CEP: 59056-000, Brazil. Electronic address: rodrigoothavio@gmail.com. 7. Federal University of Juiz de Fora (UFJF), Dental School, St. José Lourenço Kelmer, s/n - São Pedro, Juiz de Fora, MG, CEP: 36036-900, Brazil. Electronic address: fabiola-leite1@hotmail.com.
Abstract
OBJECTIVE: To investigate the influence of different surface treatments on biaxial flexure strength, roughness, and surface topography of lithium silicate/disilicate-based ceramics. METHODS: 225 discs (∅: 12 mm; 1.2 mm - ISO 6872) were made from three ceramics: IPS e.max CAD (LD - Ivoclar Vivadent), Suprinity (LSS - Vita) and Celtra Duo (LSC - Dentsply). The samples were randomly divided into 5 groups (n = 15): no treatment (C); 10% hydrofluoric acid + silane (HF); sandblasting Al2O3 + silane (SB); silicatization + silane (SC); and self-etching ceramic primer (SEP). After surface treatment, a resin cement layer was applied to the disc surface (RelyX U200, 3M ESPE), mechanical cycled (1.2 × 106 cycles, 50 N, 3.8 Hz) and submitted to biaxial flexural strength test (1 mm/min, 1000 Kgf). Roughness, EDS and SEM were also performed. Data were analyzed by one-way ANOVA, Tukey test (5%) and Weibull. RESULTS: ANOVA revealed that the "surface treatment" factor was significant for all ceramics (p < 0.05). The groups LD-HF (289.30 ± 40) LD-SEP (298. 87 ± 53.29), LSC-HF (195.51 ± 42.12), LSS-HF (269.58 ± 27.07) and LSS-SEP (207.45 ± 28.63) presented significantly higher biaxial flexure strength than respective control groups, except for the LSC-SEP (165.41 ± 33.86), which was statistically similar to the control. The Weibull modulus was significantly higher for the LD-SB, LSC-SC groups. Additionally, the LD-SB, LSC-SC and LSS-HF groups showed higher roughness compared to the other treatments. SIGNIFICANCE: HF etching followed by silanization and self-etching ceramic primer are the most suitable surface treatments for lithium silicate/disilicate-based glass-ceramics.
OBJECTIVE: To investigate the influence of different surface treatments on biaxial flexure strength, roughness, and surface topography of lithium silicate/disilicate-based ceramics. METHODS: 225 discs (∅: 12 mm; 1.2 mm - ISO 6872) were made from three ceramics: IPS e.max CAD (LD - Ivoclar Vivadent), Suprinity (LSS - Vita) and Celtra Duo (LSC - Dentsply). The samples were randomly divided into 5 groups (n = 15): no treatment (C); 10% hydrofluoric acid + silane (HF); sandblasting Al2O3 + silane (SB); silicatization + silane (SC); and self-etching ceramic primer (SEP). After surface treatment, a resin cement layer was applied to the disc surface (RelyX U200, 3M ESPE), mechanical cycled (1.2 × 106 cycles, 50 N, 3.8 Hz) and submitted to biaxial flexural strength test (1 mm/min, 1000 Kgf). Roughness, EDS and SEM were also performed. Data were analyzed by one-way ANOVA, Tukey test (5%) and Weibull. RESULTS: ANOVA revealed that the "surface treatment" factor was significant for all ceramics (p < 0.05). The groups LD-HF (289.30 ± 40) LD-SEP (298. 87 ± 53.29), LSC-HF (195.51 ± 42.12), LSS-HF (269.58 ± 27.07) and LSS-SEP (207.45 ± 28.63) presented significantly higher biaxial flexure strength than respective control groups, except for the LSC-SEP (165.41 ± 33.86), which was statistically similar to the control. The Weibull modulus was significantly higher for the LD-SB, LSC-SC groups. Additionally, the LD-SB, LSC-SC and LSS-HF groups showed higher roughness compared to the other treatments. SIGNIFICANCE: HF etching followed by silanization and self-etching ceramic primer are the most suitable surface treatments for lithium silicate/disilicate-based glass-ceramics.