Your browser doesn't support javascript.
loading
Effect of hydrofluoric acid concentration and etching time on resin-bond strength to different glass ceramics
Veríssimo, Aretha Heitor; Moura, Dayanne Monielle Duarte; Department of Dental Materials and ProsthodonticsTribst, João Paulo Mendes; Araújo, Arthur Magno Medeiros de; Leite, Fabíola Pessôa Pereira; Souza, Rodrigo Othávio de Assunção e.
Affiliation
  • Veríssimo, Aretha Heitor; Universidade Federal do Rio Grande do Norte - UFRN. Department of Dentistry. Natal. BR
  • Moura, Dayanne Monielle Duarte; Universidade Federal do Rio Grande do Norte - UFRN. Department of Dentistry. Natal. BR
  • Department of Dental Materials and ProsthodonticsTribst, João Paulo Mendes; Universidade Estadual Paulista - Unesp. Institute of Science and Technology. Department of Dental Materials and ProsthodonticsTribst, João Paulo Mendes. São José dos Campos. BR
  • Araújo, Arthur Magno Medeiros de; Universidade Federal do Rio Grande do Norte - UFRN. Department of Dentistry. Natal. BR
  • Leite, Fabíola Pessôa Pereira; Universidade Federal de Juiz de Fora - UFJF. Department of Dentistry. Juiz de Fora. BR
  • Souza, Rodrigo Othávio de Assunção e; Universidade Federal do Rio Grande do Norte - UFRN. Department of Dentistry. Natal. BR
Braz. oral res. (Online) ; 33: e041, 2019. tab, graf
Article in En | LILACS | ID: biblio-1001595
Responsible library: BR1.1
ABSTRACT
Abstract The objective of this study was to evaluate the effect of the hydrofluoridric acid (HF) concentration and time of acid conditioning on bond strength of three glass ceramics to a resin cement. Thus, fifty blocks (10 mm x 5 mm x 2 mm) of each ceramic (LDCAD IPS e.max CAD; LCAD IPS Empress CAD and LDHP IPS e.max Press) were made and embedded in acrylic resin. The surfaces were polished with sandpaper (#600, 800, 1000, and 1200 grits) and blocks were randomly divided into 15 groups (n = 10) according to the following factors Concentration of HF (10% and 5%), conditioning time (20 s and 60 s) and ceramic (LDCAD, LDHP, and L). After conditioning, silane (Prosil / FGM) was applied and after 2 min, cylinders (Ø = 2 mm; h = 2 mm) of dual resin cement (AllCem / FGM) were made in the center of each block using a Teflon strip as matrix and light cured for 40 s (1,200 mW/cm2). Then, the samples were thermocycled (10,000 cycles, 5/55°C, 30s) and submitted to the shear bond test (50 KgF, 0.5 mm/min). The data (MPa) were analyzed with 3-way ANOVA and Tukey's test (5%). Failure analysis was performed using a stereomicroscope (20x) and a scanning electron microscope (SEM). ANOVA revealed that the "concentration" factor (p = 0.01) and the interaction "acid concentration X ceramic" (p = 0.009) had a significant effect, however, the "ceramic" (p = 0.897) and "conditioning time" (p = 0.260) factors did not influence the results. The LDHP10%60s (10.98 MPa)aA* group presented significantly higher bond strength than LDHP10%20s (6.57 MPa)bA, LCAD5%20s (6,90 ±3,5)aB and LDHP5%60s (5.66 ± 2,9MPa)aA* groups (Tukey). Failure analysis revealed that 100% of specimens had mixed failure. In conclusion, etching with 5% HF for 20 seconds is recommended for lithium disilicate and leucite-reinforced CAD/CAM ceramics. However, for pressed lithium disilicate ceramic, 10% HF for 60 s showed significantly higher bond strength to resin cement.
Subject(s)
Key words

Full text: 1 Index: LILACS Main subject: Ceramics / Dental Bonding / Hydrofluoric Acid Language: En Journal: Braz. oral res. (Online) Journal subject: ODONTOLOGIA Year: 2019 Type: Article

Full text: 1 Index: LILACS Main subject: Ceramics / Dental Bonding / Hydrofluoric Acid Language: En Journal: Braz. oral res. (Online) Journal subject: ODONTOLOGIA Year: 2019 Type: Article