Maitê Munhoz Scherer1, Catina Prochnow2, Andressa Borin Venturini3, Gabriel Kalil Rocha Pereira4, Thiago Augusto de Lima Burgo5, Marília Pivetta Rippe6, Luiz Felipe Valandro7. 1. MSciD and PhD Post-Graduate Program in Oral Science (Prosthodontics Units), Faculty of Dentistry, Federal University of Santa Maria (UFSM), Marechal Floriano Peixoto Street, 1184, Centro, 97015372, Santa Maria, Rio Grande do Sul State, Brazil. Electronic address: maitemunhozscherer@hotmail.com. 2. MSciD and PhD Post-Graduate Program in Oral Science (Prosthodontics Units), Faculty of Dentistry, Federal University of Santa Maria (UFSM), Marechal Floriano Peixoto Street, 1184, Centro, 97015372, Santa Maria, Rio Grande do Sul State, Brazil. Electronic address: catinaprochnow@hotmail.com. 3. MSciD and PhD Post-Graduate Program in Oral Science (Prosthodontics Units), Faculty of Dentistry, Federal University of Santa Maria (UFSM), Marechal Floriano Peixoto Street, 1184, Centro, 97015372, Santa Maria, Rio Grande do Sul State, Brazil. Electronic address: andressa.venturini@hotmail.com. 4. MSciD and PhD Post-Graduate Program in Oral Science (Prosthodontics Units), Faculty of Dentistry, Federal University of Santa Maria (UFSM), Marechal Floriano Peixoto Street, 1184, Centro, 97015372, Santa Maria, Rio Grande do Sul State, Brazil; MSciD Graduate Program, School of Dentistry, Meridional Faculty-IMED, Senador Pinheiro Street, 304, Vila Rodrigues, 99070220, Passo Fundo, Rio Grande do Sul State, Brazil. Electronic address: gabrielkrpereira@hotmail.com. 5. Department of Physics, Federal University of Santa Maria (UFSM), Roraima Avenue, 1000, Camobi, 97105900, Santa Maria, Rio Grande do Sul State, Brazil. Electronic address: burgounicamp@gmail.com. 6. MSciD and PhD Post-Graduate Program in Oral Science (Prosthodontics Units), Faculty of Dentistry, Federal University of Santa Maria (UFSM), Marechal Floriano Peixoto Street, 1184, Centro, 97015372, Santa Maria, Rio Grande do Sul State, Brazil. Electronic address: mariliarippe@mail.ufsm.br. 7. MSciD and PhD Post-Graduate Program in Oral Science (Prosthodontics Units), Faculty of Dentistry, Federal University of Santa Maria (UFSM), Marechal Floriano Peixoto Street, 1184, Centro, 97015372, Santa Maria, Rio Grande do Sul State, Brazil. Electronic address: lfvalandro@hotmail.com.
Abstract
OBJECTIVES: To evaluate the effect of different glass-ceramic surface treatments and aging on the fatigue failure load of a lithium disilicate glass-ceramic adhesively cemented to a dentin analogue material. METHODS: One hundred and twenty (120) disc-shaped lithium disilicate specimens (Ø=10mm, thickness=1.5mm) were produced and randomly allocated (n=20) into 6 groups, considering 2 study factors: "surface treatment" in 3 levels (SIL-silane application only; HF5+SIL-5% hydrofluoric acid etching and silane application; ME&P-etching with an one-step ceramic primer), and "storage" in 2 levels (baseline-storage for 7 days; aging-storage for 90 days+12,000 thermal cycles). Ceramic discs were adhesively cemented to discs of a dentin analogue material (Ø=10mm, thickness=2.0mm) following the manufacturers' instructions. The fatigue failure load was determined by the staircase approach (250,000 cycles; 20Hz; initial load=1050N [∼70% of mean load-to-failure]; step size=52.5N [5% of initial load]). Micro-morphologic, fractographic, and atomic force microscope analysis were also performed. Fatigue failure load data were evaluated by one-way ANOVA, Bonferroni and t-tests for independent samples. RESULTS: HF5+SIL presented higher fatigue failure load in both conditions (baseline and aging); ME&P presented intermediary mean values, while the SIL group presented the worst performance. All groups had a statistically significant decrease in the fatigue performance after aging. SIGNIFICANCE: Hydrofluoric acid followed by silane application showed the best fatigue performance for an adhesively-cemented lithium disilicate ceramic. Aging negatively influenced the fatigue performance for all tested groups.
OBJECTIVES: To evaluate the effect of different glass-ceramic surface treatments and aging on the fatigue failure load of a lithium disilicate glass-ceramic adhesively cemented to a dentin analogue material. METHODS: One hundred and twenty (120) disc-shaped lithium disilicate specimens (Ø=10mm, thickness=1.5mm) were produced and randomly allocated (n=20) into 6 groups, considering 2 study factors: "surface treatment" in 3 levels (SIL-silane application only; HF5+SIL-5% hydrofluoric acid etching and silane application; ME&P-etching with an one-step ceramic primer), and "storage" in 2 levels (baseline-storage for 7 days; aging-storage for 90 days+12,000 thermal cycles). Ceramic discs were adhesively cemented to discs of a dentin analogue material (Ø=10mm, thickness=2.0mm) following the manufacturers' instructions. The fatigue failure load was determined by the staircase approach (250,000 cycles; 20Hz; initial load=1050N [∼70% of mean load-to-failure]; step size=52.5N [5% of initial load]). Micro-morphologic, fractographic, and atomic force microscope analysis were also performed. Fatigue failure load data were evaluated by one-way ANOVA, Bonferroni and t-tests for independent samples. RESULTS: HF5+SIL presented higher fatigue failure load in both conditions (baseline and aging); ME&P presented intermediary mean values, while the SIL group presented the worst performance. All groups had a statistically significant decrease in the fatigue performance after aging. SIGNIFICANCE: Hydrofluoric acid followed by silane application showed the best fatigue performance for an adhesively-cemented lithium disilicate ceramic. Aging negatively influenced the fatigue performance for all tested groups.
Authors: Amjad Abu Hasna; Stephanie Semmelmann; Fernanda Alves Feitosa; Danilo De Souza Andrade; Franklin R Tay; Cesar Rogério Pucci Journal: Int J Dent Date: 2021-03-15