隔湿剂对玻璃离子边缘密封性的影响(英文)

Effect of protective agents on edge closeness of glass ionomer cement

背景:玻璃离子水门汀目前已发展成为临床常用的充填材料,但玻璃离子在凝固的初期易吸水溶解的特性,会使充填体边缘密封性减低,产生微渗漏。因此在玻璃离子充填完成后使用隔湿剂显得尤为重要。目的:对比凡士林、Cocoa butter、光亮漆3种隔湿剂对玻璃离子边缘封闭性能的影响。设计、时间及地点:对比观察实验,于2007-07/10在青岛大学医学院附属医院中心实验室完成。材料:新鲜拔除的阻生齿40颗。清洁牙面后,高速涡轮机水冷却下于颊面近颈1/3处制备5mm×3mm×2mm的窝洞,距窝洞1mm以外的牙齿表面用无色指甲油涂覆2遍,用红蜡片封闭根尖孔。然后按照随机原则分为对照组和凡士林组、Cocoa butter组、光亮漆组,每组10颗离体牙。方法:将玻璃离子体水门汀充填于窝洞中,按照分组分别用凡士林、Coco butter及光亮漆涂于充填体表面,对照组表面不做任何处理。进行冷热交替实验和微渗漏实验。主要观察指标:记录染料渗入窝洞壁与充填体之间的深度。结果:显微镜下观察涂隔湿剂的3组与对照组均有不同程度的微渗漏。但对照组的渗入深度大于涂隔湿剂3组,差异有显著性意义(P<0.05)。凡士林、Coco abutter与光亮漆之间染料渗入情况接近,差异无显著性意义(P>0.05)。结论:凡士林、Coco abutter、光亮漆3种隔湿剂均能起到较好的隔湿效果。

BACKGROUND： Glass ionomer cement has been a commonly used filling material in the clinic. However, glass ionomer easily absorbs water and dissolves in early concretionary phase, which can reduce the leak tightness of the edge of obturator, resulting in slightly leakage. Therefore, protective agents are necessary following glass ionomer filling. OBJECTIVE： To compare the effects of three protective agents （vaseline, cocoa butter, luminous paint） on edge closeness of glass ionomer cements. DESIGN, TIME AND SETTING： The controlled observation study was performed at the Central Laboratory, Hospital Affiliated to Medical College, Qingdao University from July to October 2007. MATERIALS： Forty freshly block teeth were used. After cleaning the facing, a 5 min×3 min×2 mm cavity was made at 1/3 part near to buccal surface using a high speed turbine engine under water cooling. Tooth facing was coated twice with colorless nail-polish at 1 mm from the cavity. Apical foramen was covered with red wax sheet. Teeth were equally and randomly assigned into control group, vaseline group, cocoa butter group and luminous paint group. METHODS： Glass ionomer cement was filled into the cavity. The filling surfaces were respectively coated with vaseline, cocoa butter and luminous paint in each group. The control group was left intact. Hot-cold cycle test and microleakage test were performed. MAIN OUTCOME MEASURES： The depth from dye penetration into the cavity wall to filling was recorded. RESULTS： Microleakage to different degrees was observed in each group under the microscope. However, the penetration depth was deeper in the control group than other three groups （P 〈 0.05）. No significant difference in penetration depth was detected among the vaseline, cocoa butter and luminous paint groups （P 〉 0.05）. CONCLUSION： Vaseline, cocoa butter and luminous paint have good effects on wet prevention.