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首页> 外文期刊>Dental materials >Strength-limiting damage and its mitigation in CAD-CAM zirconia-reinforced lithium-silicate ceramics machined in a fully crystallized state
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Strength-limiting damage and its mitigation in CAD-CAM zirconia-reinforced lithium-silicate ceramics machined in a fully crystallized state

机译：在完全结晶状态下加工CAD-CAM氧化锆增强锂硅酸锂陶瓷的强度限制损伤及其缓解

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Objectives. The objective was to explore how clinically relevant machining process and heat treatment influence damage accumulation and strength degradation in lithium silicate based glass ceramics machined in the fully crystallized state.Methods. A commercial zirconia-reinforced lithium silicate (ZLS) glass ceramic with a fully developed microstructure (Celtra (R) Duo) was studied. Disk-shaped specimens (nominal 10 mm diameter and 1 mm thickness) were fabricated either using a CAD-CAM process, creating a clinically relevant dental restoration surface, or were sectioned from water-jet cut cylindrical blocks with their critical surfaces consistently polished. Bi-axial flexure strength (BFS) was determined in a ball-on-ring configuration, and fractographic analysis was performed on failed specimens. XRD, AFM and SEM measurements were conducted before and after heat treatment. For each sample group, BFS was correlated with surface roughness. A two-way ANOVA and post-hoc Tukey tests were used to determine differences in BFS between machining and heat treatment groups (? = 0.05).Results. A two-way ANOVA demonstrated that BFS was influenced by fabrication route (p 0.01) with CAD-CAM specimens exhibiting significantly lower mean BFS. A factorial interaction was observed between heat treatment and machining route (p 0.01), where a significant strengthening effect of post-manufacture heat treatment was noted for CAD CAM specimens but not sectioned and polished samples. CAD-CAM specimens exhibited sub-surface lateral cracks alongside radial cracks near fracture origin which were not observed for polished specimens. BFS did not correlate with surface roughness for polished specimens, and no change in microstructure was detectable by XRD following heat treatment.Significance. The mechanical properties of the ZLS ceramic material studied were highly sensitive to the initial surface defect integral associated with manufacturing route and order of operations. CAD-CAM manufacturing procedures result in significant strength-limiting damage which is likely to influence restoration performance; however, this can be partially mitigated by post-machining heat treatment. (C) 2020 The Academy of Dental Materials. Published by Elsevier Inc. All rights reserved.
机译：目标。目的是探讨临床相关的加工过程和热处理如何影响硅酸锂的硅酸锂玻璃陶瓷中的损伤积累和强度降解。方法。研究了一种商业氧化锆增强硅酸锂（ZLS）玻璃陶瓷，具有完全发育的微观结构（CeltraDuo）。使用CAD-CAM工艺制造磁盘状样品（标称10mm直径和1mm厚度），从而产生临床相关的牙科修复表面，或者从水射流切割圆柱形块切片，其临界表面一直抛光。在球上环构型中测定双轴弯曲强度（BFS），并在失效的标本上进行式分析。在热处理之前和之后进行XRD，AFM和SEM测量。对于每个样品组，BFS与表面粗糙度相关。双向Anova和后HOC Tukey测试用于确定加工和热处理组之间BFS的差异（？= 0.05）。结果。双向ANOVA证明了BFS受制造途径的影响（P <0.01），CAD-CAM样本表现出显着降低的平均值的BFS。在热处理和加工途径（P <0.01）之间观察到因子相互作用，其中对于制造后热处理的显着强化效果对于CAD凸轮样本，但未切断和抛光样品。 CAD-CAM标本在裂缝源附近的径向裂缝上表现出亚表面横向裂缝，该裂缝源未观察到抛光标本。 BFS与抛光标本的表面粗糙度没有相关，并且在热处理后XRD可检测到微观结构的变化。重要性。研究的ZLS陶瓷材料的力学性能对与制造路线相关的初始表面缺陷整体和操作顺序高度敏感。 CAD-CAM制造程序导致显着的强度限制损坏，可能会影响恢复性能;然而，这可以通过后加工热处理部分减轻。 （c）2020牙科材料学院。由elsevier Inc.出版的所有权利保留。

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