Evaluation of an experimental dental porcelain |
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| Authors: | Ibrahim M Hamouda Noha A El-Waseffy Ahmed M Hasan Abeer A El-Falal |
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| Institution: | 1. Tel Aviv University, School of Mechanical Engineering, Faculty of Engineering, Tel Aviv, Israel;2. National Institute of Standards and Technology, Ceramics Division, Gaithersburg, MD 20899, USA;3. New York Center For Specialized Dentistry, 150 East 58th Street, Suite 3200, New York, NY 10155, USA;4. Columbia University College of Dental Medicine, Department of Prosthodontics, 622 West 168th Street, New York, NY 10032, USA;5. New York University College of Dentistry, Department of Biomaterials and Biomimetics, 345 East 24th Street, Room 813C, New York, NY 10010, USA;1. Department of Dental Materials and Prosthodontics, Ribeirão Preto School of Dentistry, University of São Paulo, Ribeirão Preto, SP, Brazil;2. Binderware Biomaterials Ltda, São Carlos, SP, Brazil;1. School of Mining Engineering, Key Laboratory of Deep Coal Resource Mining (Ministry of Education), China University of Mining and Technology, Xuzhou, Jiangsu 221116, PR China;2. Department of Geosciences and Center for Geomechanics, Geofluids, and Geohazards, Pennsylvania State University, University Park, State College, PA 16802, USA;3. State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, Shandong 266590, PR China;1. Engineering Research Center of Optical Instrument and System, Ministry of Education, Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, No. 516 JunGong Road, Shanghai 200093, China;2. Photonics and Bio-medical Research Institute, Department of Physics Faculty of Science, East China University of Science and Technology, No. 130 Meilong Road, Shanghai 200237, China;3. Department of Applied Physics, Graduate School of Engineering, Osaka University, Yamadaoka Suita-city, Osaka 565-0871, Japan;1. Department of Engineering Science, University of Oxford, Parks Road, Oxford, OX1 3PJ, United Kingdom;2. Diamond Light Source, Harwell Science and Innovation Campus, Didcot, OX11 0QX, United Kingdom;3. Specialist Dental Group, Mount Elizabeth Orchard, #08-03/08-08/08-10, 228510, Singapore |
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| Abstract: | The aim of this study was to evaluate fracture toughness, hardness, ceramic/metal bond strength and microstructure of experimental dental porcelain and compare it with commercial type. Specimens of specific dimensions were prepared. Fracture toughness was assessed by a three-point bending test. The Vickers hardness was measured using a microhardness tester. The ceramometal bond strength was measured using a universal testing machine. The load was applied at the porcelain/metal interface via a chisel edged blade with a crosshead speed of 2.0 mm/min until fracture. The polished specimens of dental porcelain were chemically etched and the microstructure was analyzed with a scanning electron microscope. The results showed comparable fracture toughness and bond strength for both materials, while the experimental porcelain exhibited higher hardness. The experimental porcelain showed uniform cohesive failure while the commercial type showed mixed mode of failure. The microstructure of the experimental porcelain was tetragonal leucite crystals dispersed randomly in a glass matrix. The leucite crystals exist in two forms, acicular and rod like structures. It was concluded that the experimental porcelain has adequate fracture toughness and ceramic/metal bond strength that can resist the rapid crack propagation and its consequent catastrophic failure, which indicates a material serviceability in the oral cavity. |
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