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Open AccessArticle

Disilicate Dental Ceramic Surface Preparation by 1070 nm Fiber Laser: Thermal and Ultrastructural Analysis

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Department of Engineering and Architecture, University of Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy
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Micoralis Laboratory, Faculty of Dentistry, University of Cote d’Azur, 24 Avenue des Diables Bleus, 06357 Nice, France
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Author to whom correspondence should be addressed.
Bioengineering 2018, 5(1), 10; https://doi.org/10.3390/bioengineering5010010
Received: 4 November 2017 / Revised: 28 January 2018 / Accepted: 29 January 2018 / Published: 31 January 2018
Lithium disilicate dental ceramic bonding, realized by using different resins, is strictly dependent on micro-mechanical retention and chemical adhesion. The aim of this in vitro study was to investigate the capability of a 1070 nm fiber laser for their surface treatment. Samples were irradiated by a pulsed fiber laser at 1070 nm with different parameters (peak power of 5, 7.5 and 10 kW, repetition rate (RR) 20 kHz, speed of 10 and 50 mm/s, and total energy density from 1.3 to 27 kW/cm2) and the thermal elevation during the experiment was recorded by a fiber Bragg grating (FBG) temperature sensor. Subsequently, the surface modifications were analyzed by optical microscope, scanning electron microscope (SEM), and energy dispersive X-ray spectroscopy (EDS). With a peak power of 5 kW, RR of 20 kHz, and speed of 50 mm/s, the microscopic observation of the irradiated surface showed increased roughness with small areas of melting and carbonization. EDS analysis revealed that, with these parameters, there are no evident differences between laser-processed samples and controls. Thermal elevation during laser irradiation ranged between 5 °C and 9 °C. A 1070 nm fiber laser can be considered as a good device to increase the adhesion of lithium disilicate ceramics when optimum parameters are considered. View Full-Text
Keywords: disilicate ceramics; fiber lasers; fiber Bragg grating; energy dispersive X-ray spectroscopy disilicate ceramics; fiber lasers; fiber Bragg grating; energy dispersive X-ray spectroscopy
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Fornaini, C.; Poli, F.; Merigo, E.; Brulat-Bouchard, N.; El Gamal, A.; Rocca, J.-P.; Selleri, S.; Cucinotta, A. Disilicate Dental Ceramic Surface Preparation by 1070 nm Fiber Laser: Thermal and Ultrastructural Analysis. Bioengineering 2018, 5, 10.

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