优化的微结构表面对 NPJ 打印氧化锆结合强度和耐久性的影响。
The effects of optimized microstructured surfaces on bond strength and durability of NPJ-printed zirconia.
机构信息
Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Zhejiang Provincial Clinical Research Center for Oral Diseases, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Engineering Research Center of Oral Biomaterials and Devices of Zhejiang Province, Hangzhou, Zhejiang 310000, China.
Thales Medical Technology, Hangzhou, Zhejiang, China.
出版信息
Dent Mater. 2024 Nov;40(11):1991-1999. doi: 10.1016/j.dental.2024.09.016. Epub 2024 Sep 24.
OBJECTIVES
This study was to investigate the effects of optimized microstructured surfaces on bond strength and bond durability of the latest nanoparticle jetting (NPJ)-printed zirconia.
METHODS
Zirconia microstructured surfaces with different geometries and void volume were analyzed through three-dimensional finite element analysis for surface micromorphology optimization. Zirconia disks and cylinders were additively manufactured by an NPJ 3D printer (N = 128). They were randomly divided into four groups based on surface micromorphology optimization and airborne-particle abrasion (APA) treatment before they were bonded using 10-methacryloloxydecyl dihydrogen phosphate (MDP) containing resin cement (Clearfil SA luting cement). The shear bond strengths (SBSs) were tested before and after 10,000 thermocycles and were analyzed by one-way ANOVA analysis. Failure modes were determined by optical microscopy. Zirconia surfaces were analyzed with X-ray diffraction, scanning electron microscopy, and three-dimensional interference microscopy.
RESULTS
The optimized microstructured surface was characterized by circular microstructures with 60 % void volume, about 20 µm of depths, about 10 µm of undercuts, and consistent beam widths. The optimized microstructured surface combined with APA treatment and MDP-containing resin cement possessed the highest SBSs both before and after thermocycling aging (P＜0.05). The greater reductions of zirconia bond strengths occurred when the zirconia were not treated with APA (P＜0.05).
SIGNIFICANCE
The optimized microstructured zirconia surface with circular microstructures and 60 % void volume fabricated by the latest NPJ printing technology could greatly enhance the zirconia bond strength and durability in combination with APA treatment and application of MDP-containing resin cement, which might be promising for adhesively bonded indirect restorations of NPJ-printed zirconia.
目的
本研究旨在探讨优化的微结构表面对最新纳米喷射（NPJ）打印氧化锆的粘结强度和粘结耐久性的影响。
方法
通过三维有限元分析对不同几何形状和空隙体积的氧化锆微结构表面进行分析，以优化表面微观形态。采用 NPJ 3D 打印机（N=128）增材制造氧化锆圆盘和圆柱。根据表面微观形态优化和喷丸处理（APA），将它们随机分为四组，然后使用含有 10-甲氧基癸基二氢磷酸酯（MDP）的树脂水泥（Clearfil SA 水门汀）进行粘结。在 10000 次热循环前后测试剪切粘结强度（SBS），并进行单因素方差分析。通过光学显微镜确定失效模式。用 X 射线衍射、扫描电子显微镜和三维干涉显微镜分析氧化锆表面。
结果
优化的微结构表面的特征是具有 60%空隙体积、约 20 µm 深度、约 10 µm 底切和一致的梁宽的圆形微观结构。优化的微结构表面与 APA 处理和含 MDP 的树脂水泥结合，在热循环老化前后均具有最高的 SBS（P＜0.05）。未经过 APA 处理的氧化锆粘结强度降低幅度更大（P＜0.05）。
意义
采用最新 NPJ 打印技术制造的具有圆形微观结构和 60%空隙体积的优化微结构氧化锆表面，结合 APA 处理和应用含 MDP 的树脂水泥，可显著提高氧化锆的粘结强度和耐久性，有望用于 NPJ 打印氧化锆的粘结性间接修复。
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