两种牙色修复材料吸水膨胀及边缘适合性研究

Hygroscopic expansion and marginal adaptation of two resin-based restorative materials

目的:评价临床常用的两种牙色修复材料复合树脂Filtek Z250和树脂加强型玻璃离子Fuji II LC的吸水膨胀及边缘适合性。方法:采用人工窝洞,将两种材料制作的人工间隙试件浸于去离子水和硅油中,12周内于不同时间点在高倍体视显微镜下观察间隙的变化,以反映材料的吸水膨胀及边缘适合性。结果:在水相中,Fuji II LC的吸水膨胀比Filtek Z250更加明显。Fuji II LC在初期膨胀速度较快,随后放缓,而Filtek Z250在12周内吸水膨胀速度比较均匀。结论:复合树脂和树脂加强型玻璃离子两种材料的组分不同,膨胀过程和程度也不一样,临床上选择材料时应根据不同情况,正确选择和应用牙色修复材料。

Objective：This study was aimed to examine the hygroscopic expansion of two resin-based restorative materials on artificial marginal gap reduction over 12 weeks water storage by using oil storage as control. Method： Forty teflon cylinders were sectioned for two types of materials. Each cylinder was 5 mm deep and had an internal diameter of 5mm. For each material, 10 cylinders were stored in de-ionised water（W） and the other 10 were stored in non-aqueous silican oil （O）. The changes of artifical gaps were. aninspected with a stereoscopical microscope at different time during the period of 12 weeks. Result： More hygroscopic expansion was observed from the Fuji II LC group than the Z250 group in the aqueous phase storage. The Fuji II LC expanded fast at the early stage,then presented a steady hygroscopic expansion rate. However, Z250 showed a even gap closure through the whole water storage. Conclusion： Composite and resin-modified glass ionomer cements have different components, the hygroscopic expansion procedure and degree of which are also different. It is important to choose proper esthetic materials acording to certain condition during clinical practice.