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首页> 外文期刊>Journal of Dental Materials and Techniques >Processing Capability of Apatite-Mullite Glass-Ceramic Materials for the Production of Dental Restorations
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Processing Capability of Apatite-Mullite Glass-Ceramic Materials for the Production of Dental Restorations

机译：磷灰石-莫来石玻璃陶瓷材料在牙科修复中的加工能力

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Introduction : There is currently significant interest in all-ceramic dental restorations. A potential non-metallic material for such restorations is an apatite-mullite glass-ceramic that could be processed to shape using different processing techniques. The aim of this study was to assess and evaluate the ability of an apatite-mullite glass-ceramic material to be processed using three routes: lost-wax casting, hot pressing and CAD-CAM milling. Methods : A batch of glass for an apatite-mullite glass-ceramic material was produced based on the formula (4.5SiO2-3Al2O3-1.5P2O5-3CaO-0.5 CaF 2). The batch was converted into glass by heating at 1050?C/1450?C for two hours. The final melt was quenched to obtain a glass frit. The glass was thermally treated based on the DTA data. The sequence of crystallization and their micro structural evaluation were analysed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). An anatomically correct mould of an upper right first molar was selected to trial the three different manufacturing techniques. Empress II and VITA block mark II materials were used as control materials. Results : The apatite-mullite material being evaluated can be cast and milled to shape, but the ceramic form of the material is not capable of being hot pressed. Conclusion : The materials tested show great possibility as restorative materials and could be heat treated inside and outside the investment casting material to produce a crystalline microstructure of apatite and apatite-mullite. It is possible to produce acceptable restorations using the milling technique. Hot pressing the material is not recommended due to its high liquidus temperature.
机译：简介：目前，人们对全瓷牙修复体非常感兴趣。用于此类修复的潜在非金属材料是磷灰石-莫来石玻璃陶瓷，可以使用不同的加工技术加工成一定形状。这项研究的目的是评估和评估磷灰石-莫来石玻璃陶瓷材料通过三种途径加工的能力：失蜡铸造，热压和CAD-CAM研磨。方法：基于式（4.5SiO2-3Al2O3-1.5P2O5-3CaO-0.5 CaF 2）制备一批用于磷灰石-莫来石玻璃陶瓷材料的玻璃。通过在1050℃/ 1450℃下加热2小时，将该批料转变成玻璃。将最终的熔体淬火以获得玻璃粉。根据DTA数据对玻璃进行热处理。使用X射线衍射（XRD）和扫描电子显微镜（SEM）分析了结晶顺序及其微观结构评估。选择解剖学上正确的右上第一磨牙模具来试验三种不同的制造技术。 Empress II和VITA block mark II材料用作对照材料。结果：被评估的磷灰石-莫来石材料可以铸造和研磨成一定形状，但是该材料的陶瓷形式不能被热压。结论：所测试的材料显示出作为修复材料的可能性，并且可以在精密铸造材料的内部和外部进行热处理，以产生磷灰石和磷灰石-莫来石的晶体微结构。使用铣削技术可以生产出可接受的修复体。由于液相线温度高，不建议热压该材料。

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