Background And Aims: The aim of this study was to measure the microhardness values of irradiated computer-aided design/computer-aided manufacturing (CAD/CAM) ceramics surfaces before and after thermal treatment.
Materials And Methods: Sixty CAD/CAM ceramic discs were prepared and grouped by material, i.e. lithium disilicate ceramic (Emax CAD) and zirconia ceramic (Emax ZirCAD). Laser irradiation at the material surface was performed with a carbon dioxide laser at 5 Watt (W) or 10 W power in continuous mode (CW mode), or with a neodymium:yttrium aluminum perovskite (Nd:YAP) laser at 10 W on graphite and non-graphite surfaces. Vickers hardness was tested at 0.3 kg for lithium disilicate and 1 kg for zirconia.
Results: Emax CAD irradiated with CO at 5 W increased microhardness by 6.32 GPa whereas Emax ZirCAD irradiated with Nd:YAP decreased microhardness by 17.46 GPa.
Conclusion: CO laser effectively increases the microhardness of lithium disilicate ceramics (Emax CAD).
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5515706 | PMC |
| http://dx.doi.org/10.5978/islsm.17-OR-01 | DOI Listing |
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