![]() Plate Preparation: Materials and ProcessesĬolor Printmaking: Materials and Processes ![]() Introduction to Simultaneous Structuring of Intaglio and Surface Colors in Printmaking He also works as a general dentist in the UAB Faculty Practice.New Ways of Simultaneous Intaglio and Surface Color Printmaking He has lectured nationally and internationally on the subject of dental materials. He serves on the American Dental Association Council of Scientific Affairs and is on the editorial board of The Journal of Adhesive Dentistry and Compendium. He was the 2016 recipient of the Stanford New Investigator Award and the 2017 3M Innovative Research Fellowship both from the American Dental Association. ![]() His research interests are the mechanical, optical, and biologic properties of dental materials and clinical evaluation of new dental materials. He has served as an investigator on over 50 clinical and laboratory research grants, and published over 150 peer reviewed articles, book chapters, and research abstracts. He graduated from UAB School of Dentistry in 2011 and obtained his PhD in Biomedical Engineering in 2012. Lawson, is the Director of the Division of Biomaterials at the University of Alabama at Birmingham School of Dentistry and the program director of the Biomaterials residency program. Glass beads used at 2-4 bar (30-60 psi) pressure are able to remove excess resin cement without affecting the strength of the underlying ceramic.ĭr. Glass beads can be thought of as small tennis balls as they are round and soft, whereas alumina particles are like small rocks as they are hard and irregular in shape. Glass beads are an alternate sandblasting particle that are less abrasive than alumina particles. After the crown is removed from the furnace, small pieces of burned cement will be present that can be cleaned in an ultrasonic bath or with an alcohol wipe.Īnother option to clean residual cement from lithium disilicate is to sandblast it with 50 micron glass beads. By keeping the holding temperature below 590☌ (the nucleation temperature for lithium metasilicate crystals), the strength and translucency of the crown should not be affected. One option to remove cement from lithium disilicate is to place it in a ceramic furnace in the following program: stand-by temperature (B) = 403☌, closing time (S) = 03:00, temperature increase (t) = 15☌, holding temperature (T) = 550☌, holding timer (H) = 05:00, vacuum on temperature (V1) = 403☌, vacuum off temperature (V2) = 550☌, and cool down gradient (L) = 0. Grinding the residual cement from lithium disilicate with a coarse diamond bur will reduce its strength and may affect the internal fit of the restoration. If a glass-based ceramic, such as lithium disilicate, is sandblasted with 50 micron alumina at 2 bar pressure, it will lose 25% of its strength. In fact, sandblasting zirconia with alumina particles is the laboratory procedure which is used to give zirconia surface texture for bonding.Ĭleaning residual cement from the intaglio surface of glass-based ceramics, however, must be performed with more care in order to prevent damage to the underlying ceramic. Sandblasting zirconia with alumina particles does not reduce its strength due to its ability to heal cracks through transformation toughening. Cleaning residual resin cement from zirconia can be achieved by sandblasting with 50 micron alumina at 2 bar (30 psi) pressure.
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