Working time of elastomeric impression materials |
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| Authors: | M Ohsawa W Finger |
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| Affiliation: | 1. School of Dentistry, Niigata University, Japan;2. Department of Prosthetic Dentistry and Dental Technology, Dental School of the RWTH, Aachen, D-5100 West Germany;1. Department of Biomaterials and Bioengineering, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15 Kuramoto, Tokushima 770-8504, Japan;2. Department of Comprehensive Dentistry, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15 Kuramoto, Tokushima 770-8504, Japan;1. Director, Predoctoral Implant Prosthodontics and Clinical Assistant Professor, Indiana University School of Dentistry, Indianapolis, Ind;2. Dental student, UCLA School of Dentistry, Los Angeles, Calif;3. Professor and Director, Advanced Specialty Education in Prosthodontics, School of Dentistry, Loma Linda University, Loma Linda, Calif;4. Clinical Professor, Advanced Prosthodontics, Loma Linda University School of Dentistry, Loma Linda, Calif;1. Private practice, Koka Dental Corporation, San Diego, Calif;2. Lecturer, Advanced Prosthodontics, UCLA School of Dentistry, Los Angeles, Calif;3. CEO, Career Design in Dentistry, San Diego, Calif;5. Clinical Professor and Chair in Prosthodontics, Institute of Dentistry, University of Eastern Finland, Kuopio, Finland;4. Chief Dentist, Department of Oral and Maxillofacial Diseases, Kuopio University Hospital, Kuopio, Finland;5. Senior Researcher, Adhesive Dentistry Research Group, Department of Restorative Dentistry and Cariology, Institute of Dentistry, University of Turku, Turku, Finland;1. Department of Polymers and Pigments, National Research Centre, Dokki, Cairo, Egypt;2. Ain Shams University, Faculty of Science, Department of Physics, 11566 Abbasia, Cairo, Egypt;3. Basic Science Department, Modern Academy for Engineering and Technology, El Mokatam, Cairo, Egypt |
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| Abstract: | The working times of 4 elastomeric single-phase impression materials were determined by means of the ADA No. 19 specification test, by an oscillating rheometer method and by evaluation of the accuracy of impressions made at stepwise delayed intervals until due to increase in consistency the production of impressions became impossible. The working times found by the different methods were not generally consistent. However, the ADA test proved practically acceptable when compared with the results of the accuracy test. |
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