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Ceramic surface preparations for resin bonding.

A Della Bona1, R van Noort

  • 1University of Passo Fundo, School of Clinical Dentistry, Dept of Restorative Dentistry, RS, Brazil.

American Journal of Dentistry
|September 9, 1999
PubMed
Summary
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Hydrofluoric acid (HF) etching preferentially attacks leucite in feldspar ceramics, altering surface preparation features. Acidulated phosphate fluoride (APF) etching creates unidentified surface deposits on ceramic surfaces.

Area of Science:

  • Dental Materials Science
  • Ceramic Surface Chemistry

Background:

  • Leucite-containing feldspar ceramics are widely used in dental restorations.
  • Surface preparation and etching are critical for achieving durable bonding of dental cements.
  • Hydrofluoric acid (HF) and acidulated phosphate fluoride (APF) are common etchants for ceramic surfaces.

Purpose of the Study:

  • To compare the effects of hydrofluoric acid (HF) and acidulated phosphate fluoride (APF) primers on variously prepared leucite-containing feldspar ceramic surfaces.
  • To analyze the microstructural and compositional changes induced by these etching agents.

Main Methods:

  • Leucite-containing feldspar ceramic discs were prepared using polishing, grit blasting, or diamond bur methods.
  • Surfaces were etched with either HF or APF.

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  • Surface topography was analyzed using scanning electron microscopy (SEM).
  • Microstructural and compositional analysis was performed using back-scattered imaging, EDS, and X-ray diffraction (XRD).

    • Main Results:

    • HF etching selectively targeted the leucite phase over the glass matrix and removed prior surface preparation features.
    • APF etching resulted in the formation of surface deposits, obscuring the underlying surface topography.
    • XRD analysis could not identify the composition of the deposits formed by APF etching.

    Conclusions:

    • HF and APF etching agents have distinct effects on leucite-containing feldspar ceramic surfaces.
    • HF alters the surface by preferential leucite attack, while APF introduces unidentified surface deposits.
    • Understanding these differences is crucial for optimizing bonding protocols in dental applications.