Microhardness evaluations of CAD/CAM ceramics irradiated with CO2 or Nd:YAP laser

Microhardness evaluations of CAD/CAM ceramics irradiated with CO2 or Nd:YAP laser

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. Material and Methods: Sixty CAD/CAM ceramic discs were prepared and grouped by material,...

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Veröffentlicht in:LASER THERAPY 2017, Vol.26(1), pp.13-18
Hauptverfasser: Gamal, Ahmed El, Rocca, Jean Paul, Fornaini, Carlo, Medioni, Etienne, Brulat-Bouchard, Nathalie
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CAD/CAM ceramic
CO2 laser
Engineering Sciences
Materials
Microhardness
Nd:YAP laser
Original
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container_end_page 18
container_issue 1
container_start_page 13
container_title LASER THERAPY
container_volume 26
creator Gamal, Ahmed El
Rocca, Jean Paul
Fornaini, Carlo
Medioni, Etienne
Brulat-Bouchard, Nathalie
description 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. Material 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 kgF for lithium disilicate and 1 kgF for zirconia.. Results: Emax CAD irradiated with CO2 at 5 W increased microhardness by 6.32 GPa whereas Emax ZirCAD irradiated with Nd:YAP decreased microhardness by 17.46 GPa. Conclusion: CO2 laser effectively increases the microhardness of lithium disilicate ceramics (Emax CAD).
doi_str_mv 10.5978/islsm.17-OR-01
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Material 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 kgF for lithium disilicate and 1 kgF for zirconia.. Results: Emax CAD irradiated with CO2 at 5 W increased microhardness by 6.32 GPa whereas Emax ZirCAD irradiated with Nd:YAP decreased microhardness by 17.46 GPa. Conclusion: CO2 laser effectively increases the microhardness of lithium disilicate ceramics (Emax CAD).</abstract><pub>International Phototherapy Association</pub><pmid>28740324</pmid><doi>10.5978/islsm.17-OR-01</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record>
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subjects CAD/CAM ceramic
CO2 laser
Engineering Sciences
Materials
Microhardness
Nd:YAP laser
Original
title Microhardness evaluations of CAD/CAM ceramics irradiated with CO2 or Nd:YAP laser
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