Ahmed El Gamal1, Carlo Fornaini2, Jean Paul Rocca3, Omid H Muhammad1, Etienne Medioni3, Annamaria Cucinotta4, Nathalie Brulat-Bouchard5. 1. Micoralis laboratoy EA 7354, University of Nice Sophia Antipolis, Nice, France. 2. Micoralis laboratoy EA 7354, University of Nice Sophia Antipolis, Nice, France; Group of Applied ElectroMagnetics, Information Engineering Department, University of Parma, Italy. 3. Micoralis laboratoy EA 7354, University of Nice Sophia Antipolis, Nice, France; Restorative Dentistry and Endodontics Department, Faculty of Dentistry, University of Nice-Sophia Antipolis, Nice, France; Pôle Odontologie, CHU Nice Saint Roch, Nice, France. 4. Group of Applied ElectroMagnetics, Information Engineering Department, University of Parma, Italy. 5. Restorative Dentistry and Endodontics Department, Faculty of Dentistry, University of Nice-Sophia Antipolis, Nice, France; Pôle Odontologie, CHU Nice Saint Roch, Nice, France.
Abstract
BACKGROUND AND AIMS: The objective of this study was to investigate the interaction of infrared laser light on Computer Aided Design and Computer Aided Manufacturing (CAD/CAM) ceramic surfaces. MATERIAL AND METHODS: Sixty CAD/CAM ceramic discs were prepared and divided into two different groups: lithiumdisilicate ceramic (IPSe.maxCADs) and Zirconia ceramic (IPSe.maxZirCADs). The laser irradiation was performed on graphite and non-graphite surfaces with a Carbon Dioxide laser at 5W and 10W power in continuous mode (CW mode) and with Neodymium Yttrium Aluminum Perovskite (Nd:YAP) laser at 10W. Surface textures and compositions were examined using Scanning Electron Microscopy (SEM), and Energy Dispersive Spectroscopy (EDS). Thermal elevation was measured by thermocouple during laser irradiation. RESULTS: The SEM observation showed a rough surface plus cracks and fissures on CO2 10W samples and melting areas in Nd:YAP samples; moreover, with CO2 5W smooth and shallow surfaces were observed. EDS analysis revealed that laser irradiation does not result in modifications of the chemical composition even if minor changes in the atomic mass percentage of the components were registered. Thermocouple showed several thermal changes during laser irradiation. CONCLUSION: CO2 and Nd:YAP lasers modify CAD/CAM ceramic surface without chemical composition modifications.
BACKGROUND AND AIMS: The objective of this study was to investigate the interaction of infrared laser light on Computer Aided Design and Computer Aided Manufacturing (CAD/CAM) ceramic surfaces. MATERIAL AND METHODS: Sixty CAD/CAM ceramic discs were prepared and divided into two different groups: lithiumdisilicate ceramic (IPSe.maxCADs) and Zirconia ceramic (IPSe.maxZirCADs). The laser irradiation was performed on graphite and non-graphite surfaces with a Carbon Dioxide laser at 5W and 10W power in continuous mode (CW mode) and with Neodymium Yttrium Aluminum Perovskite (Nd:YAP) laser at 10W. Surface textures and compositions were examined using Scanning Electron Microscopy (SEM), and Energy Dispersive Spectroscopy (EDS). Thermal elevation was measured by thermocouple during laser irradiation. RESULTS: The SEM observation showed a rough surface plus cracks and fissures on CO2 10W samples and melting areas in Nd:YAP samples; moreover, with CO2 5W smooth and shallow surfaces were observed. EDS analysis revealed that laser irradiation does not result in modifications of the chemical composition even if minor changes in the atomic mass percentage of the components were registered. Thermocouple showed several thermal changes during laser irradiation. CONCLUSION:CO2 and Nd:YAP lasers modify CAD/CAM ceramic surface without chemical composition modifications.
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