Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-Ku, Tokyo, 113-8549, Japan.
Oral Biomedical Engineering, Graduate School, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-Ku, Tokyo, 113-8549, Japan.
Clin Oral Investig. 2024 May 9;28(6):305. doi: 10.1007/s00784-024-05680-9.
To evaluate the ability of the water glass treatment to penetrate zirconia and improve the bond strength of resin cement.
Water glass was applied to zirconia specimens, which were then sintered. The specimens were divided into water-glass-treated and untreated zirconia (control) groups. The surface properties of the water-glass-treated specimens were evaluated using surface roughness and electron probe micro-analyser (EPMA) analysis. A resin cement was used to evaluate the tensile bond strength, with and without a silane-containing primer. After 24 h in water storage at 37 °C and thermal cycling, the bond strengths were statistically evaluated with t-test, and the fracture surfaces were observed using SEM.
The water glass treatment slightly increased the surface roughness of the zirconia specimens, and the EPMA analysis detected the water glass penetration to be 50 μm below the zirconia surface. The application of primer improved the tensile bond strength in all groups. After 24 h, the water-glass-treated zirconia exhibited a tensile strength of 24.8 ± 5.5 MPa, which was significantly higher than that of the control zirconia (17.6 ± 3.5 MPa) (p < 0.05). After thermal cycling, the water-glass-treated zirconia showed significantly higher tensile strength than the control zirconia. The fracture surface morphology was mainly an adhesive pattern, whereas resin cement residue was occasionally detected on the water-glass-treated zirconia surfaces.
The water glass treatment resulted in the formation of a stable silica phase on the zirconia surface. This process enabled silane coupling to the zirconia and improved the adhesion of the resin cement.
评估水玻璃处理对氧化锆的渗透性及其对树脂水门汀粘结强度的影响。
水玻璃应用于氧化锆样本，然后对样本进行烧结。将样本分为水玻璃处理组和未处理的氧化锆（对照组）。使用表面粗糙度和电子探针微分析（EPMA）分析评估水玻璃处理样本的表面特性。使用树脂水门汀评估拉伸粘结强度，有无含硅烷的底漆。在 37°C 水中储存 24 小时并进行热循环后，使用 t 检验对粘结强度进行统计学评估，并使用 SEM 观察断裂表面。
水玻璃处理略微增加了氧化锆样本的表面粗糙度，EPMA 分析检测到水玻璃渗透到氧化锆表面以下 50 μm。底漆的应用提高了所有组的拉伸粘结强度。24 小时后，水玻璃处理的氧化锆的拉伸强度为 24.8 ± 5.5 MPa，明显高于对照组的氧化锆（17.6 ± 3.5 MPa）（p < 0.05）。经过热循环后，水玻璃处理的氧化锆的拉伸强度明显高于对照组。断裂表面形态主要为粘着模式，而水玻璃处理的氧化锆表面偶尔会检测到树脂水门汀残留。
水玻璃处理在氧化锆表面形成了稳定的硅石相。该过程使硅烷与氧化锆偶联，并改善了树脂水门汀的粘结。
