立体光固化造型术：一种通过添加剂计算机辅助制造加工牙科陶瓷的新方法。
Stereolithography: A new method for processing dental ceramics by additive computer-aided manufacturing.
机构信息
Department of Prosthodontics, Faculty of Dentistry, University of Lille, Place de Verdun, 59000, Lille, France; LMCPA, Laboratoire des Matériaux Céramiques et Procédés Associés, University of Valenciennes and Hainaut Cambrésis, Boulevard Charles de Gaulle, 59600, Maubeuge, France.
Department of Endodontic and Restorative Dentistry, Faculty of Dentistry, University of Lille, Place de Verdun, 59000, Lille, France; LMCPA, Laboratoire des Matériaux Céramiques et Procédés Associés, University of Valenciennes and Hainaut Cambrésis, Boulevard Charles de Gaulle, 59600, Maubeuge, France.
出版信息
Dent Mater. 2017 May;33(5):477-485. doi: 10.1016/j.dental.2017.01.018. Epub 2017 Mar 17.
OBJECTIVES
The aim of this study was to compare the physical and mechanical properties of stereolithography (SLA)- manufactured alumina ceramics of different composition to those of subtractive- manufactured ceramics and to produce suitable dental crown frameworks.
METHODS
The physical and mechanical properties of a control and six experimental SLA ceramics prepared from slurries with small (S) and large (L) particles (0.46±0.03 and 1.56±0.04μm, respectively) and three dry matter contents (70%, 75%, 80%) were evaluated by dynamic rheometry, hydrostatic weighing, three3-point flexural strength measurements, and Weibull analyses, and by the micrometrics measurement of shrinkage ratio before and after the heat treatments.
RESULTS
S75 was the only small particle slurry with a significantly higher viscosity than L70. The viscosity of the S80 slurry made it impossible to take rheological measurements. The viscosities of the S75 and S80 slurries caused deformations in the printed layers during SLA manufacturing and were excluded from further consideration. SLA samples with low dry matter content had significantly lower and densityflexural strengths. Only SLA samples with a large particle size and high dry matter content (L75 and L80) were similar in density and flexural strength to the subtractive- manufactured samples. The 95% confidence intervals of the Weibull modulus of the L80 ceramic were higher (no overlap fraction) than those of the L75 ceramic and were similar to the control (overlap fraction). The Weibull characteristics of L80 ceramic were higher than those of L75 ceramic and the control. SLA can be used to process suitable crown frameworks but shows results in anisotropic shrinkage.
SIGNIFICANCE
The hH High particle size and dry matter content of the L80 slurry allowed made it possible to produce a reliable ceramic by SLA manufacturing with an anisotropic shrinkage, and a density, and flexural strength similar to those of a subtractive-manufactured ceramic. SLA allowed made it possible to build up a dense 3D alumina crown framework with controlled shape. Further studies on the marginal adaptation and shrinkage model of alumina crown frameworks will be required to optimize the process.
目的
本研究旨在比较不同成分的立体光固化（SLA）制造氧化铝陶瓷与减材制造陶瓷的物理和机械性能，并制作合适的牙冠支架。
方法
通过动态流变学、静水称重、三点弯曲强度测量和威布尔分析，以及测量热前后收缩率的微观测量，评估了由小（S）和大（L）颗粒（分别为 0.46±0.03 和 1.56±0.04μm）和三种干物质含量（70%、75%、80%）的浆料制备的对照和六种实验性 SLA 陶瓷的物理和机械性能。
结果
S75 是唯一一种小颗粒浆料，其粘度明显高于 L70。S80 浆料的粘度使得无法进行流变测量。S75 和 S80 浆料的粘度导致 SLA 制造过程中打印层变形，因此被排除在进一步考虑之外。低干物质含量的 SLA 样品的密度和弯曲强度明显较低。只有大颗粒尺寸和高干物质含量（L75 和 L80）的 SLA 样品在密度和弯曲强度方面与减材制造样品相似。L80 陶瓷的威布尔模数 95%置信区间（无重叠部分）高于 L75 陶瓷，与对照（重叠部分）相似。L80 陶瓷的威布尔特征高于 L75 陶瓷和对照。SLA 可用于加工合适的牙冠支架，但表现出各向异性收缩的结果。
意义
L80 浆料的高颗粒尺寸和干物质含量使得可以通过 SLA 制造生产出可靠的陶瓷，其各向异性收缩、密度和弯曲强度与减材制造陶瓷相似。SLA 使得可以制造具有受控形状的致密氧化铝 3D 牙冠支架。需要进一步研究氧化铝牙冠支架的边缘适应性和收缩模型，以优化该工艺。
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