Giugliano Thomas S, Zhang Yu, Janal Malvin N, Lim Chek Hai, Smith Ruby M, Choi Mijin
Department of Prosthodontics, New York University College of Dentistry, New York, New York, USA.
Laboratories for Microstructure Physics & Mechanics of Materials, Department of Preventive and Restorative Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
J Prosthodont. 2024 Dec;33(9):891-898. doi: 10.1111/jopr.13778. Epub 2023 Nov 1.
The purpose of this study was to compare the dimensional accuracy, translucency, and biaxial flexural strength of milled zirconia (MZ) versus 3D-printed zirconia (PZ) discs.
MATERIALS & METHODS: A circular disc measuring 14.0 mm in diameter and 1.20 mm in thickness was designed using computer-aided design (CAD) software. The resulting standard tessellation language (STL) file was used both as a control and to fabricate 36 zirconia (3Y-TZP) disc specimens (n = 36): 18 were milled (group MZ) and 18 were 3D-printed (group PZ). The diameter and thickness of each disc were measured using a digital caliper. Translucency was evaluated using a calibrated dental colorimeter. The flexural strength was determined using the piston-on-three-ball biaxial flexure test. All measurements were done by one blinded examiner. The statistical significance level was set to α = 0.05.
The MZ discs had significantly more accurate dimensions than the PZ discs in both diameter and thickness when compared to the control CAD software-designed disc. The MZ discs exhibited significantly higher translucency (translucency parameter (TP) = 16.95 ±0.36 vs. 9.24 ±1.98) and biaxial flexural strength (996.16 ±137.37 MPa vs. 845.75 ±266.16 MPa) than the PZ discs. Finally, MZ possessed a significantly higher Weibull modulus relative to PZ.
The results showed that the milled specimens achieved better dimensional accuracy and were more translucent, stronger, and less prone to failure than printed specimens.
本研究旨在比较铣削氧化锆（MZ）与3D打印氧化锆（PZ）圆盘的尺寸精度、半透明度和双轴弯曲强度。
使用计算机辅助设计（CAD）软件设计了直径为14.0毫米、厚度为1.20毫米的圆形圆盘。生成的标准镶嵌语言（STL）文件既用作对照，也用于制造36个氧化锆（3Y-TZP）圆盘样本（n = 36）：18个通过铣削制成（MZ组），18个通过3D打印制成（PZ组）。使用数字卡尺测量每个圆盘的直径和厚度。使用校准的牙科色度计评估半透明度。使用活塞对三球双轴弯曲试验测定弯曲强度。所有测量均由一名盲法检查者进行。统计学显著性水平设定为α = 0.05。
与对照CAD软件设计的圆盘相比，MZ圆盘在直径和厚度方面的尺寸精度均显著高于PZ圆盘。MZ圆盘的半透明度（半透明度参数（TP）= 16.95 ±0.36 vs. 9.24 ±1.98）和双轴弯曲强度（996.16 ±137.37 MPa vs. 845.75 ±266.16 MPa）均显著高于PZ圆盘。最后，MZ的韦布尔模量相对于PZ显著更高。
结果表明，铣削样本比打印样本具有更好的尺寸精度，更半透明、更强且更不易失效。
