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The status of dental ceramic technology at home and abroad


ficationandtestmethods symplectic n laboratory water test method specifications, lSO6892Metallicmate-rials - Tensiletesting Metallic materials - tensile testing, ISO/17405 Biological evaluation of dental materials and other standards in the IS0 - 6872, 9693 are also cited. In 6872, the use of dental ceramics by the definition of various concepts: such as low temperature grill temperature is lower than 1050 ℃, 1050 ℃ in temperature and grill temperature 1200 ℃ I burn a collapse is greater than 1200 ℃, edge ceramic (coreceramie), provide mechanical strength and color-based opaque porcelain teeth Keran. Of dental ceramics physical and chemical properties of t given lean body does not receive Yasushi 12 4 ■ they enjoy the rear of No. 48 was greater than the total 4O, or a linear shrinkage of not more than l6%. Flexural strength: not less than the nuclear porcelain 100N/ram. Tooth physical layer} not less than 55 (N / mm) | enamel layer of not less than SON/lfflIn2. Against the thermoplastic can (Resistancetopyroplas-ticflow) provides for 2 minutes, 16 minutes after high-temperature thermal insulation value of height. Of chemical attack (chemicalSol-ubitity),[link widoczny dla zalogowanych], anti-staining properties (Resistancetostaining) also provides qualified to determine whether or not the value and the corresponding test methods. In LSO9693 in Keran porcelain teeth are used for metal, tooth-speed color layer, intrinsic layer, enamel and other properties, Qi were defined. Changes in the composition of the alloy provides the maximum allowable rate of change. Bad performance of the ceramic reference ISO6872, provides dentin, body and enamel flexural strength, minimum 50Mp; intrinsic layer and enamel layer of chemical attack is not greater than 0.05. Specified in the ISO9683 not be less than the minimum tensile strength of metal 250ppa, the percentage elongation after fracture shall not be lower to 2% | For Metal - Ran ceramic system, the need to determine the appropriate thermal expansion of metal Ran porcelain, ceramic glass transition temperature point , metal and porcelain bonding Ran, this provides the appropriate test methods and these performance indicators. 2, the status of the domestic dental ceramic technology for a national dental ceramic technology and a wide gap compared to developed countries. In measuring the color of natural teeth is the main color than the color standard pull as flutter, flutter with the natural tooth color were analyzed and compared. Sad porcelain goods in bad equipment, supply only Shanghai Dental Materials Division of the acid plant and the joint development of Shanghai launched a series of porcelain bad, but currently only a few hospitals in the use of the ceramic powder. Also moving in a number of papers report, there were also the successful development of ceramic powder was reported. In Shanghai Dental Material Factory standards have been responsible for drafting the reference LSO4824 (dentistry - porcelain teeth) of the national standard GB7110 porcelain teeth, but LSO6872 dental ceramic, IsO9693 they enjoy the complex metal ceramic dental materials correspond, not saw the same, equivalent or by reference to national standards. That is currently used in dental porcelain ceramic technology products abroad, mainly from the Preparation of the ceramic,[link widoczny dla zalogowanych], but I theory, technology, flutter color measurement and control technology has been rapid development of the domestic current. Color measurement instrument of domestic manufacturers have been able to produce optical color measurement instrument; Kube1h-MaTlk. Theory has been used for dyeing, plastic industry, the color subjects in the ceramics industry is also just around the corner} the use of domestic experience will completely solve the color, the color a big problem. China - a wealth of ancient iron porcelain Ran less than 0.03% of the natural raw materials can be made directly to the introduction of porcelain teeth Keran simple dental ceramics. The latest test equipment, such as X-ray fluorescence analyzer,[link widoczny dla zalogowanych], high-temperature X-ray diffraction, X-ray laser particle size measuring instrument capsule, in the country are equipped with a number of ceramic laboratory, so that the performance of dental ceramic materials can be controlled. Therefore, China has possessed the capacity development of porcelain teeth Keran. 3 Conclusion of domestic technology and foreign porcelain dental Keran still a wide gap between the developed countries. In the developed cities and regions,[link widoczny dla zalogowanych], such as Shanghai, Beijing and Guangdong, has introduced a metal baking porcelain technique. This month only three sad porcelain teeth prepared twenty thousand former times,[link widoczny dla zalogowanych], to be 4o kg porcelain worse. With the continued development of the domestic economy, the modern beauty of the teeth, Paul Gui attention, demand will shoot up, therefore, focus on someone to deliver financial and technical, {lj preparation and Ceramics in China, the name of the country in line Ran dental porcelain powder, and then high profits is the thistle can do what must be done thistle. ■ t Bong Choi received the text of spring Debate oral drug Railway Medical College Hospital, Mr. Zhao Jun, and the amount of technicians carefully City ● Ran a dental hospital with the help of Mr. oath before. In this I thank them
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