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排序方式: 共有665条查询结果,搜索用时 15 毫秒
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Khalid M. Abdelaziz BDS MSc PhD Edward C. Combe PhD DSc James S. Hodges PhD 《Journal of prosthodontics》2002,11(3):161-167
PURPOSE: This study was conducted to evaluate the effect of selected disinfectants incorporated in the liquid of dental stones on material strength properties with the aim of developing a material with acceptable mechanical properties. MATERIALS AND METHODS: Two types of dental stone (types III and V) were mixed with aqueous solutions of 0.525% sodium hypochlorite, 0.1% and 10% povidone-iodine, and 2% glutaraldehyde, and with water as a control. The liquid/powder ratios recommended by the manufacturer were used. These materials were subjected to further modification by adding a mixture of 1.0% gum arabic and 0.132% calcium hydroxide to the hemihydrate powders before mixing with the disinfectant solutions at 2 different liquid/powder ratios for each. Both the regular and the modified materials were tested for compressive and diametral tensile strength after 1 hour and 1 week from the start of the mix. The structure of set materials was determined by scanning electron microscopy examination of fracture surfaces. RESULTS: The disinfectants often reduced the strength of both types of dental stone. However, using either 0.1% povidone-iodine or 0.525% sodium hypochlorite resulted in strength values comparable with that of the control. The addition of gum arabic and calcium hydroxide helped reduce the mixing liquid/powder ratios, improving the strength properties of the disinfected materials. CONCLUSIONS: Chemical disinfectants reduce the strength of dental gypsum when used as mixing water substitutes. Gum arabic and calcium hydroxide additives permit a lower liquid/powder ratio and can help offset this weakening. 相似文献
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D. Brown MSc PhD CEng MIM Editor M. Braden BSc PhD FInstP FPRI B.E. Causton BSc PhD E.C. Combe MSc PhD DSc CChem FRSC D.W. Cruickshanks-Boyd BSc CEng MIM Angela M. Fletcher BDS LDS RCS MIM AMPRI C.H. Lloyd BSc PhD J.F. McCabe BSc PhD CChem MRSC M. Miller BSc CChem FRSC H.J. Prosser BSc PhD N.E. Waters BSc PhD FInstP D.C. Watts BSc PhD CChem FRSC D.F. Williams BSc PhD CEng FIM A.D. Wilson DSc CChem FRSC H.J. Wilson PhD DSc CChem FRSC 《Journal of dentistry》1981,9(4):271-298
This paper, which is presented in two parts, reviews the work on dental materials published in 1979. Included in Part II are sections on impression materials, model, die and investment materials, waxes, acrylic resins, denture base polymers, soft lining materials and tissue conditioners, cast and wrought dental alloys, ceramics, implants and, finally, corrosion. Part I included sections on dental biomechanics, fissure sealants, cements, amalgam, composite filling materials, endodontic materials and microleakage. 相似文献
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This work was undertaken to explore the effect of saliva addition on the rheological properties of two contrasting tooth bleaching systems, one of which was a paste (Colgate Platinum) and the other a gel (Zaris, 3M ESPE). Using a dynamic stress rheometer with cone and plate geometry, it was shown that addition of artificial saliva reduced the apparent viscosity of each material. However, in some cases this was accompanied by an increase in elasticity. It is suggested that saliva may not have a deleterious effect on the ability of the materials to remain in the bleaching tray. 相似文献
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AIM: This study was undertaken to evaluate which materials were in the alpha-form of gutta-percha as claimed, and which were in the more conventional beta-form, and to explore the effect of heating on the materials. METHODOLOGY: Samples of gutta-percha without chemical additives, and dental gutta-percha formulations which included (i) two products previously studied; (ii) 12 newer products; and (iii) one newer product that had been stored at high temperature, were analysed by simultaneous differential thermal analysis and thermogravimetry. RESULTS: It was found that only four of the newer materials contained the alpha-form; all the rest comprised beta-gutta-percha. No weight loss was found for any material under the conditions of the present experiments. A typical heating cycle up to 130 degrees C caused changes in material behaviour - that is, on reheating fewer endothermic peaks were present. Storage of gutta-percha samples for 10 years under ambient temperature and storage in a heater at 80 degrees C appeared to have no effect on properties. CONCLUSIONS: It was concluded that heating dental gutta-percha to 130 degrees C causes physical changes; this was not seen with chemically pure gutta-percha. The presence of additives in the dental samples altered material behaviour. 相似文献
6.
N.E. Waters M. Braden D. Brown E.C. Combe A.J. von Fraunhofer M. Miller T.C. Tranter D.F. Williams A.D. Wilson H.J. Wilson 《Journal of dentistry》1976,4(3):101-115
This paper, which is presented in two parts, reviews the work on dental materials published in 1974. Included in Part I were sections on amalgam, casting alloys, denture base polymers, composite filling materials, soft lining materials, fissure sealants, impression materials, dental ceramics and model and die materials. A review of the literature relating to cements, dental implants and dental biomechanics is presented in Part II. 相似文献
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Behrens Frank Leage Soyi Liu Sapin Christophe El Baou Celine De La Torre Inmaculada Meszaros Gabriella Schett Georg Combe Bernard van den Bosch Filip Gossec Laure 《Clinical rheumatology》2021,40(12):4955-4956
Clinical Rheumatology - 相似文献