Abstract
Objective: This study evaluated the influence of low concentration acid treatment on the shear bond strength between lithium disilicate (LD) infrastructure and veneering porcelain. The surface morphology characteristic after this acid treatment was also examined. Study Design: LD reinforced ceramic cylinders (n=10) (IPS e.max Press, Ivoclar-Vivadent, Schaan, Liechtenstein) were treated (LD-treated) with a low concentration acid solution (Invex Liquid – Ivoclar-Vivadent, Schaan, Liechtenstein) or not treated with the acid solution (LD-untreated). They were veneered with a glass ceramic (IPS e.max Ceram, Ivoclar-Vivadent, Schaan, Liechtenstein). A metal ceramic group (CoCr) was tested as control. Shear bond strength (SBS) was conducted using a universal testing machine at 0.5 mm/min. Surface morphology characteristics after acid treatment were analyzed using scanning electron microscopy. Results: The acid treatment at low concentrations did not influence the SBS of the LD/veneering porcelain interface. The CoCr group showed the significant higher SBS value (35.59 ± 5.97 MPa), followed by LD-untreated group (27.76 ± 3.59 MPa) and LD-treated (27.02 ± 4.79 MPa). The fracture modes were predominantly adhesive for CoCr group and cohesive within the infrastructure for DL groups. Scanning Electron Microscopy (SEM) analysis showed no morphological differences between treated and untreated LD surfaces. Conclusions: Low concentration acid treatment did not improved SBS of veneering ceramic to LD and did not cause morphological changes on the LD surface. Key words:Lithium disilicate, glass ceramics, acid etching, shear bond strength, scanning electron microscopy.
Highlights
A great development of all ceramic systems for dental restoration occurred in the last 20 years, which provided to the clinician a more aesthetic alternative for anterior and posterior cases [1,2]
This can be explained by the similarity in the chemical composition of the IPS e.max Ceram porcelain and the lithium disilicate (IPS e.max Press), mainly related to SiO2 e a o K2O
The application of the acid solution composed by 0.6% hydrofluoric acid and 1.7% sulfuric acid did not have influence on the shear bond strength of lithium disilicate/veneering porcelain interface, what indicates that the acid treatment does not improve the bonding between the materials tested
Summary
A great development of all ceramic systems for dental restoration occurred in the last 20 years, which provided to the clinician a more aesthetic alternative for anterior and posterior cases [1,2]. The manufacturer recommends the use of an acid solution with approximately 0.6% of hydrofluoric acid and 1.7% of sulfuric acid by a period between 10 and 30 minutes, inside an ultrasonic container, after the divesting of ceramic pieces This procedure would have the function of preventing problems in the bonding to the veneering porcelain. The present study evaluated the influence of low concentration acid treatment on the bond strength of lithium disilicate reinforced ceramics to veneering porcelain. It was performed a surface morphology analysis by Scanning Electron Microscopy to characterize the morphological aspects of the surfaces after different acid treatments
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