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Scientific article
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Hydrofluoric acid concentration and etching time affect differently the microstructure and surface properties of pressed lithium disilicate glass ceramics

Published inJournal of esthetic and restorative dentistry, vol. 36, no. 1, p. 47-55
Publication date2024-01
First online date2023-09-29
Abstract

Objective: To evaluate the effect of different hydrofluoric acid concentrations and etching times on the surface, chemical composition and microstructure of lithium disilicate.

Material and methods: Ninety specimens of pressed lithium disilicate (LDS) were obtained (IPS e.max Press, Rosetta SP and LiSi Press). The specimens of each material were divided in two groups according to the hydrofluoric acid concentration: 5% and 10% (n = 15/group), and subdivided according to the etching time: 20, 40 and 60 s (n = 5/group). Crystalline evaluations and chemical composition were performed through x-ray diffraction (XRD) and energy-dispersive x-ray spectroscopy (EDS), respectively. Microstructural analyses were performed by scanning electron microscope (SEM), surface roughness (Ra), and material thickness removal evaluation. Thickness removal and Ra data were analyzed by ANOVA and Tukey test (p < 0.05).

Results: XRD demonstrated characteristic peaks of lithium disilicate crystals, lithium phosphate and of a vitreous phase for all materials. EDS identified different compositions and SEM confirmed different surface responses to acid etching protocols. Material and etching time influenced Ra and material thickness removal (p < 0.05).

Conclusion: Hydrofluoric acid concentration and etching time affect the surface characteristics of LDS differently. LiSi Press presented higher resistance to hydrofluoric acid etching compared to e.max Press and Rosetta SP.

Clinical significance: Applying the appropriate etching protocol is pivotal to avoid excessive material removal and to prevent jeopardize the mechanical and optical properties of the material.

eng
Keywords
  • Acid etching
  • Glass composition
  • Hydrofluoric acid
  • Lithium disilicate glass ceramic
  • Microstructure
  • Hydrofluoric Acid / chemistry
  • Materials Testing
  • Dental Porcelain / chemistry
  • Ceramics / chemistry
  • Surface Properties
  • Dental Bonding / methods
  • Resin Cements / chemistry
Citation (ISO format)
ALVES, Larissa M M et al. Hydrofluoric acid concentration and etching time affect differently the microstructure and surface properties of pressed lithium disilicate glass ceramics. In: Journal of esthetic and restorative dentistry, 2024, vol. 36, n° 1, p. 47–55. doi: 10.1111/jerd.13140
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Identifiers
ISSN of the journal1496-4155
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