数字光处理打印牙科氧化锆的微观结构和 机械性能研究. (Chinese)

Objective This study was performed to investigate the microstructure and mechanical properties of den‐ tal zirconia manufactured by digital light processing (DLP) 3D printing and the clinical application prospects of this ma‐ terial. Methods The experiment (DLP) group was zirconia manufactured by DLP 3D printing, and the control (MILL) group was milled zirconia. The density, grain size, and phase composition were measured to study the microstructure. Flexural strength was measured by using three-point bending tests, while Vickers hardness was determined through a Vickers hardness tester. Fracture toughness was tested using the single-edge V-notched beam method. Results Zirco‐ nia density of the DLP group was (6.019 8±0.021 3) g·cm -3 , and the average grain size was (0.603 0±0.032 6) μm, but without statistical difference with the corresponding values of the MILL group (P>0.05). Tetragonal phase was found in the X-ray diffraction patterns of the DLP and MILL groups. The flexural strength of the DLP group was (1 012.7± 125.5) MPa, and Vickers hardness was (1 238.5±10.8) HV1, which was slightly lower than that of the MILL group (P< 0.05). The fracture toughness of the DLP group was (7.22±0.81) MPa·m1/2, which was not statistically different from that of the MILL group (P>0.05). Conclusion Zirconia man‐ ufactured by DLP 3D printing had microstructure and me‐ chanical properties similar to those of the milled zirconia. Only the flexural strength and the Vickers hardness of the experimental zirconia were slightly lower than those of the milled zirconia. Therefore, DLP-manufactured zirconia has a promising future for clinical use. [ABSTRACT FROM AUTHOR]

研究数字光处理技术 （DLP） 打印牙科氧化锆的微观结构特征和机械性能，探究其临床应用前 景。方法 以DLP技术制备氧化锆为实验组 （DLP组），数控切削技术制备氧化锆为对照组 （MILL组），测定其 密度、晶粒尺寸及晶相构成以研究微观结构特征，采用三点弯曲试验测量挠曲强度，硬度计测量维氏硬度，单 边 V 槽横梁法测量断裂韧度。结果 DLP 组氧化锆的密度为 （6.019 8±0.021 3） g·cm -3 ，晶粒尺寸为 （0.603 0± 0.032 6） μm，与 MILL组无统计学差异 （P>0.05）。2组氧化锆晶相构成均为单一四方相。DLP组氧化锆挠曲强 度为 （1 012.7±125.5） MPa，维氏硬度为 （1 238.5±10.8） HV1，略低于 MILL 组 （P<0.05）；断裂韧度为 （7.22± 0.81） MPa·m 1/2 ，与 MILL 组无统计学差异 （P>0.05）。结论 DLP 成型牙科氧化锆的微观结构 特征及机械性能与切削氧化锆相似，仅挠曲强度和维氏硬度略低于切削氧化锆，显示出良好的 临床应用前景。 [ABSTRACT FROM AUTHOR]

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