Department of Conservative Dentistry, Jeonbuk National University School of Dentistry 567 Baekje-daero, Jeonju 54896, Korea.
Medicina (Kaunas). 2020 Oct 28;56(11):568. doi: 10.3390/medicina56110568.
: This study aimed to investigate the change in bond strength between resin cement and tetragonal zirconia polycrystalline stabilized with 3 to 8 mol% yttrium oxide (Y-TZP) and observe the topographical change of the Y-TZP surface when etched with hydrofluoric acid (HF) solution under different concentration and temperature conditions. : Non-etched sintered Y-TZP specimens under two different temperature conditions (room temperature and 70-80 °C, respectively), were used as a control, while experimental groups were etched with 5%, 10%, 20%, and 40% HF solutions for 10 min. After zirconia primer and MDP-containing resin cement were applied to the Y-TZP surface, the shear bond strength (SBS) of each experimental group was measured. : Under room temperature conditions, the highest SBS value was measured in the 40% HF etching group, representing a significant deviation from the other groups ( < 0.05). In the 70-80 °C tests, the 40% HF etching group also had the highest SBS value, but there was no significant difference when compared to the 20% HF etching group ( > 0.05). From SEM and AFM observations, the HF solution increasingly dissolved the Y-TZP surface grain structure as the concentration and application temperature rose, resulting in high surface roughness and irregularities. : Pretreating with either 20% HF solution at 70-80 °C or 40% HF solution at room temperature and 70-80 °C effectively acid etched the Y-TZP surface, resulting in more surface roughness and irregularities. Accounting for the concentration and temperature conditions of the HF solution, using 40% HF solution at room temperature will result in improvements in adhesion between resin cement and Y-TZP.
本研究旨在探讨在不同浓度和温度条件下，用氢氟酸（HF）溶液对添加 3-8mol%氧化钇（Y）的四方氧化锆多晶（Y-TZP）的粘结强度的变化，并观察 Y-TZP 表面在 HF 溶液蚀刻后的形貌变化。本研究将未经蚀刻的烧结 Y-TZP 标本在两种不同温度条件下（分别为室温及 70-80°C）作为对照组，实验组则用 5%、10%、20%和 40%HF 溶液蚀刻 10 分钟。在 Y-TZP 表面涂覆氧化锆底涂剂和含 MDP 的树脂水门汀后，测量每个实验组的剪切粘结强度（SBS）。在室温条件下，40%HF 蚀刻组的 SBS 值最高，与其他组相比差异有统计学意义（<0.05）。在 70-80°C 测试中，40%HF 蚀刻组的 SBS 值也最高，但与 20%HF 蚀刻组相比差异无统计学意义（>0.05）。SEM 和 AFM 观察结果表明，随着 HF 溶液浓度和应用温度的升高，HF 溶液逐渐溶解 Y-TZP 表面的晶粒结构，导致表面粗糙度和不规则性增加。结果表明，70-80°C 下的 20%HF 溶液或室温及 70-80°C 下的 40%HF 溶液预处理均可有效蚀刻 Y-TZP 表面，导致表面粗糙度和不规则性增加。考虑到 HF 溶液的浓度和温度条件，在室温下使用 40%HF 溶液可提高树脂水门汀与 Y-TZP 之间的粘结。
