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< Vol. 15 Issue 1 | Jan-Mar 2017 | pp. e1 - e106

Does acid etching morphologically and chemically affect lithium disilicate glass ceramic surfaces?

Abstract

Background

This study evaluated the surface morphology, chemical composition and adhesiveness of lithium disilicate glass ceramic after acid etching with hydrofluoric acid or phosphoric acid.

 Methods

Lithium disilicate glass ceramic specimens polished by 600-grit silicon carbide paper were subjected to one or a combination of these surface treatments: airborne particle abrasion with 50-μm alumina (AA), etching with 5% hydrofluoric acid (HF) or 36% phosphoric acid (Phos), and application of silane coupling agent (Si). Stainless steel rods of 3.6-mm diameter and 2.0-mm height were cemented onto treated ceramic surfaces with a self-adhesive resin cement (Clearfil SA Cement). Shear bond strengths between ceramic and cement were measured after 24-hour storage in 37°C distilled water.

 Results

SEM images of AA revealed the formation of conventional microretentive grooves, but acid etching with HF or Phos produced a porous surface. Bond strengths of AA+HF+Si (28.1 ± 6.0 MPa), AA+Phos+Si (17.5 ± 4.1 MPa) and HF+Si (21.0 ± 3.0 MPa) were significantly greater than those of non-pretreated controls with Si (9.7 ± 3.7 MPa) and without Si (4.1 ± 2.4 MPa) (p<0.05). In addition, HF etching alone (26.2 ± 7.5 MPa) had significantly higher bond strength than AA alone (11.5 ± 4.0 MPa) (p<0.05). AA+HF, AA+Phos and HF showed cohesive failures.

 Conclusions

Etching with HF or Phos yielded higher bond strength between lithium disilicate glass ceramic and self-adhesive resin cement without microcrack formation.

J Appl Biomater Funct Mater 2017; 15(1): e93 - e100

Article Type: ORIGINAL RESEARCH ARTICLE

DOI:10.5301/jabfm.5000303

Authors

Yukinori Maruo, Goro Nishigawa, Masao Irie, Kumiko Yoshihara, Takuya Matsumoto, Shogo Minagi

Article History

  • • Accepted on 04/05/2016
  • • Available online on 17/09/2016
  • • Published online on 26/01/2017

Disclosures

Financial support: This work was partially supported by a Grant-in-Aid for Scientific Research (KAKENHI), grant number 15K11159, from the Japan Society for the Promotion of Science (JSPS).
Conflict of interest: None of the authors has any financial interest related to this study to disclose.

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Authors

Affiliations

  • Occlusion and Removable Prosthodontics, Okayama University, Okayama - Japan
  • Department of Biomaterials, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama - Japan
  • Center for Innovative Clinical Medicine, Okayama University, Okayama - Japan
  • Department of Occlusal and Oral Functional Rehabilitation, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama - Japan

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