【摘要】 研究酸蚀对光敏玻璃离子的微渗漏影响。方法：采用侵害性窝沟封闭技术处理36颗人离休磨牙，并随机分成3组，每组12颗，第Ⅰ组为对照组，用37％磷酸酸蚀后，用低粘稠度复合树脂Liquicoat封闭窝沟裂隙。第Ⅱ组处理同第Ⅰ组，用低粘稠度光敏玻璃离子PrimaFlow封闭窝沟裂隙。第Ⅲ组与第Ⅱ组不同之处，对牙釉质不进行酸蚀。每组半数牙齿进行热循环处理（5～55℃，2500周）。所有标本用0．5％亚甲基蓝着色，在立体显微镜下观察微渗漏等级。结果：微渗漏第Ⅰ组与第Ⅱ组相似（P＞0．05）。第Ⅰ、Ⅱ组较第Ⅲ组小（P＜0．001）。复合树脂经热循环处理后微渗漏有增加（P＜0．01），而光敏玻璃离子粘固粉经热循环处理后微渗漏没有增加（P＞0．05）。结论：光敏玻璃离子结合酸蚀技术能减少微渗漏。更多还原

【Abstract】 Objective: To evaluate the effect of acid etching on microleakage of a new resin-modified glassionomer-Primaplow. Methods: Thirty-six human molar teeth were randomly divided into 3 groups. All cavitieswere opened with a conventional bur in pits and fissures. Group 1 (control, 12 teeth) was etched with 37%phosphoric acid and sealed with a low viscous resin composite Liquicoat. Group 2 was etched with 37% phospho-ric acid and sealed with a new resin-modified glass ionomer-PrimaFlow. Group 3 was sealed with PrimaFlowwithout acid etching. Half specimens of each group were submitted to thermocycling (5 ~ 5 5 ℃ 2 5 0 0 cycles ). Allspecimens were stained with 0. 5% methylene blue solution. Results: Microleakage in group l was similar tothat in group 2 (P>0.05). PrimaFlow without acid etching leaked significantly more than did the control group(P<0.001). PrimaFlow with acid etching leaked significantly less than that without etching (P<0.001 ). Following the thermocycling, the microleakage of the resin composite significantly increased (P<0.01 ), but themicroleakage of the resin-modified glass ionomer didn’t (P> 0.05 ). Conclusion: The resin-modified glassionomer cement should be combined with acid etching to reduce microleakage prior to placement of pit and fissuresealant.更多还原