CAD/CAM可切削新型牙科复相陶瓷基底材料的研究及临床应用

近来，氧化锆基底材料被越来越多的应用于口腔修复临床治疗，因其具有优秀的生物安全性，可与金属媲美的强度，极佳的美学仿真效果而得到广大患者和医师的青睐。但目前的可切削氧化锆材料也存在一些问题，最突出的是烧结收缩率较大，烧结结晶工艺要求专用高温烧结炉，时间较长，温控程序复杂，并且烧结4个以上单位长桥时极易发生变形，从而导致精度降低，甚至临床失败。本研究拟通过在亚微米级3Y-TZP颗粒周围均匀包裹纳米级氧化铝和氮化硼颗粒，获得具有较高强度和韧性的可切削热压烧结陶瓷坯体，同时利用氧化铝的标准生成自由能高于TZP及氮气保护下氮化硼的生成为正向反应的特点，克服了热压烧结过程中的脱氧变色问题，避免了结晶烧结收缩及不规则的烧结后形态变化，从而提高修复体精度，简化制作工艺，缩短治疗周期，使其更好地应用于口腔临床修复工作之中。

Recently, zirconia substrate materials are increasingly being used in the Prosthodontics clinical treatment, because of its excellent biological safety, strength, excellent aesthetics simulation results can be comparable with the metal and get the favor of the majority of patients and physicians. Can cut zirconia material, there are some problems, the most prominent of sintering shrinkage, sintering crystallization process requires a special high-temperature sintering furnace, longer thermostat complicated procedures and sintering four or more units Longbridge easily deformed, leading to reduced accuracy, even clinical failure. This study by uniformly wrapped around 3Y-TZP particles in the submicron the nanometer alumina and boron nitride particles, to obtain a higher strength and toughness of the cutting hot pressing sintering ceramics preform, while using alumina standard free generated as a positive response characteristics can be higher than the boron nitride in TZP and nitrogen protection, to overcome the problem of the deoxidation discoloration in the hot press sintering process, avoiding the morphological changes after crystallization sintering shrinkage and irregular sintering, thereby improving the prosthesis accuracy, and simplify the production process, shorten the treatment period, it better be applied to the oral clinical repair work.