Physicochemical surface characterizations of four dental CAD/CAM lithium disilicate-based glass ceramics on HF etching: An XPS study |
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| Affiliation: | 1. Dental Biomaterials Research Laboratory, Department of Restorative Dentistry, University of Manitoba, Winnipeg, Manitoba, Canada;2. Department of Oral Biology, University of Manitoba, Winnipeg, Manitoba, Canada;3. Department of Engineering Physics, École Polytechnique, Montréal, Québec, Canada;1. Department of Chemistry, Clemson University, Clemson, SC 29634-0973, USA;2. Department of Electrical Engineering, Clemson University, Clemson, SC 29634-0973, USA;3. Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC 29634-0973, USA;1. Doctoral student, Department of Clinical Procedures, Rio de Janeiro State University, Rio de Janeiro, Brazil;2. Doctoral student, Department of Clinical Procedures, Rio de Janeiro State University, Rio de Janeiro, Brazil;3. Postdoctoral student, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil;4. Associate Professor, Department of Prosthesis, Rio de Janeiro State University, Rio de Janeiro, Brazil;1. São Paulo State University (UNESP), Science and Technology Institute, São José dos Campos, São Paulo, Brazil;2. Faculty of Odontology, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul, Brazil;3. School of Dentistry, Meridional Faculty — IMED, Passo Fundo, Rio Grande do Sul, Brazil;4. Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), Institute of Science and Technology, São José dos Campos, São Paulo, Brazil |
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| Abstract: | The surfaces of four lithium disilicate glass ceramics (LDGC) were characterized at the nanolevel. The goal was to detect the chemical alteration of the surface on etching with hydrofluoric acid (HF). The four LDGC tested were Celtra Duo, IPS e.max CAD, Straumann n!ce and Vita Suprinity. Four blocks of each LDGC were sectioned to ∼ 1 mm thicknesses. The requirement for firing, or not, was carried out following the manufacturer’s recommendations. The samples were then divided into two groups: a control and an etched group. Etching was carried out using a solution of 5% HF for 20 s, rinsed for 20 s and dried for 10 s, using an air jet. The atomic percentages of the first atomic layers were probed using X-ray photoelectron spectroscopy (XPS) in the survey mode (n = 12). The oxygen and silicon peaks (O1s and Si2p) were then analyzed in the high resolution mode. The samples were also characterized using scanning electronic microscopy at high magnification (60 k). XPS showed the amounts of the major elements, Si, O and Li, were changed on etching. For all samples, trace elements, such as P, Zn, Y, Na and Sr, disappeared on glassy phase dissolution. Zr and Al percentages varied, based on the LDGC analyzed. High resolution spectra of the O1s and Si2p peaks showed that the chemical environments were qualitatively different in all samples. Acid etching, using 5% HF for 20 s, modified not only the topographic structure, but also the chemical composition of the LDGC surface. |
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| Keywords: | Acid etching Glass ceramics Lithium disilicate SEM XPS |
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