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比较3种临床常用含氟衬洞材料在去离子水中的释氟情况及其抗压强度。将3种含氟衬洞材料各制备5个8 mm×4 mm的柱状标本,浸入12 m L去离子水中,恒温37℃。采用氟离子选择电极法,分别于1 d、2 d、3 d、5 d、7 d、14 d、21 d、28 d、35 d测定3种衬洞材料氟离子的释放量。另外各制备10个3 mm×3 mm的柱状标本,用于测试抗压强度,采用DZS-Ⅲ硬脆材料性能检测仪,以0.5 mm/min的加载速度垂直加压直至试样破坏,记录破坏时的载荷。FujiⅨ玻璃离子水门汀、美丽牙医流动树脂均在第1天的氟释放量最高,然后第2天急剧降低,随后氟离子释放趋于平稳。智能牙本质树脂Smart Dentin Replacement(简称SDR)在1~35 d内维持稳定低释氟水平。在各时间点,FujiⅨ玻璃离子水门汀的氟释放量均高于美丽牙医流动树脂和SDR,三者差异有统计学意义(p<0.05)。SDR组抗压强度最高,FujiⅨ玻璃离子水门汀组抗压强度最低,三者差异有统计学意义(p<0.05)。3种材料均能够在一定时间内向周围液体环境释放氟离子,而FujiⅨ玻璃离子水门汀显示出了更好的释氟能力,在预防继发龋上可能具有一定的优势。但在抗压强度方面,SDR表现出更好的物理性能,这提示SDR作为衬洞材料可以更好的承受咬合力,延长修复体的使用寿命。
Fluoride-releasing conditions and compressive strength of three kinds of commonly used fluorine-containing lining materials in deionized water were compared. Five columnar specimens of 8 mm × 4 mm were prepared from each of the three fluoride-containing materials and immersed in 12 m L of deionized water at a constant temperature of 37 ° C. Fluoride ion selective electrode method was used to determine the release of fluoride ions in three kinds of lining materials on 1 d, 2 d, 3 d, 5 d, 7 d, 14 d, 21 d, 28 d and 35 d respectively. In addition, 10 specimens of 3 mm × 3 mm were prepared for testing the compressive strength. The samples were vertically pressed at a loading rate of 0.5 mm / min using a DZS-III hard-brittle material tester until the specimens were destroyed and recorded. When the load. Fuji IX glass ionomer cement, the beautiful dentist fluid resin all had the highest amount of fluoride released on day 1, then drastically decreased on day 2, followed by a steady release of fluoride. Smart Dentin Replacement (SDR) maintained a stable low level of fluorine release within 1 ~ 35 d. At each time point, the fluoride release of FujiIX glass ionomer cement was higher than that of the beautiful dentist flow resin and SDR, the difference was statistically significant (p <0.05). The compressive strength of SDR group was the highest, while that of FujiIX glass ionomer cement group was the lowest. The difference was statistically significant (p <0.05). All three materials were able to release fluoride ions to the surrounding liquid environment in a certain period of time, while FujiIX glass ionomer cement showed better fluoride releasing ability, which may have certain advantages in preventing secondary caries. However, the compressive strength of SDR showed better physical properties, suggesting that SDR as a lining material can better withstand the occlusal force and prolong the service life of the prosthesis.