Effect of sandblasting, etching and resin bonding on the flexural strength/bonding of novel glass-ceramics

Chinwe O Uwalaka; Natalia Karpukhina; Xu Cao; Sami Bissasu; Rory M Wilson; Michael J Cattell

doi:10.1016/j.dental.2018.07.001

Effect of sandblasting, etching and resin bonding on the flexural strength/bonding of novel glass-ceramics

Dent Mater. 2018 Oct;34(10):1566-1577. doi: 10.1016/j.dental.2018.07.001. Epub 2018 Jul 31.

Authors

Chinwe O Uwalaka¹, Natalia Karpukhina¹, Xu Cao¹, Sami Bissasu¹, Rory M Wilson², Michael J Cattell³

Affiliations

¹ Centre for Oral Bioengineering, Bart's and the London, School of Medicine and Dentistry, Queen Mary University of London, Turner Street, Whitechapel, E1 2AD, UK.
² School of Engineering and Materials Science, Queen Mary University of London, London, Mile End Road, E1 4NS, UK.
³ Centre for Oral Bioengineering, Bart's and the London, School of Medicine and Dentistry, Queen Mary University of London, Turner Street, Whitechapel, E1 2AD, UK. Electronic address: m.cattell@qmul.ac.uk.

PMID: 30072165
DOI: 10.1016/j.dental.2018.07.001

Abstract

Objectives: To process novel leucite glass-ceramics and test the effects of surface treatment and resin bonding on the biaxial flexural strength (BFS) and shear bond strength (SBS).

Methods: Alumino-silicate glasses were ball-milled, and heat treated to form leucite glass-ceramics (LG-C, OLG-C), then sintered into ingots. Ingots were heat extruded into a refractory mould to form disc specimens (1.3×14mm diameter). IPS e.max^® was used as a commercial comparison. Glass-ceramic test groups were sandblasted (Groups. 1, 4, 6), sandblasted, etched and adhesively bonded (Groups. 2, 5, 7) or lapped, etched and adhesively bonded (Groups. 3, 8). Specimens were adhesively bonded with Monobond S, followed by the application of Variolink II^® cement and light curing. BFS testing was at 1mm/min and SBS testing at 0.5mm/min. Samples were characterised using XRD, SEM and profilometry.

Results: XRD confirmed tetragonal leucite in LG-C/OLG-C and lithium disilicate/lithium orthophosphate in IPS e.max^®. Mean BFS (MPa (SD)) were: Gp1 LG-C; 193.1 (13.9), Gp2 LG-C; 217.7 (23.0), Gp3 LG-C; 273.6 (26.7), Gp4 OLG-C; 255.9 (31); Gp5 OLG-C; 288.6 (37.4), Gp6 IPS e.max^®; 258.6 (20.7), Gp7 IPS e.max^®; 322.3 (23.4) and Gp8 IPS e.max^®; 416.4 (52.6). The Median SBS (MPa) were Gp1 LG-C; 14.2, Gp2 LG-C (10s etch); 10.6 and Gp3 IPS e.max^®; 10.8. Mean surface roughness was 5-5.1μm (IPS e.max^®) and 2.6μm (LG-C).

Significance: Novel leucite glass-ceramics with reduced flaw size and fine microstructures produced enhanced BFS and SBS by resin bonding. These properties may be useful for the fabrication of minimally invasive aesthetic and fracture resistant restorations.

Keywords: Acid-etching; Glass-ceramic; Sandblasting; Tetragonal leucite; X-ray diffraction.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Acid Etching, Dental
Aluminum Silicates / chemistry*
Ceramics / chemistry*
Dental Porcelain
Flexural Strength
Materials Testing
Resin Cements / chemistry*
Silicon Dioxide / chemistry*
Surface Properties
X-Ray Diffraction

Substances

Aluminum Silicates
IPS e.max Ceram
Resin Cements
Dental Porcelain
leucite
Silicon Dioxide
Glass ceramics