新型树脂根管充填材料的制备及其稳定性评价

Preparation and stability assessment of a new resin root canal filling material

目的制备新型树脂根管充填材料(new resin root canal filling material,NRCFM)并评价其在不同溶液介质中的稳定性。方法以热塑性聚烯烃弹性体和乙烯-醋酸乙烯酯共聚物为基体,辅以活性填料,制备 NRCFM。采用质量测定、离子浓度分析及表面形貌观察等方法,评价 NRCFM 在双蒸水、酸性及碱性人工唾液中的稳定性。结果本研究制备出新型树脂根管充填材料 NRCFM1和NRCFM2。在不同溶液介质中 NRCFM1和 NRCFM2质量变化趋势是吸水溶胀敛质量增加,成分溶解后失重均小于0.5%,与牙胶一致(P>0.05),优于树脂胶(P<0.001)。NRCFM1和 NRCFM2在水介质中离子成分稳定,在碱性介质中硅离子浓度轻度增加。经不同溶液介质处理后,NRCFM1和NRCFM2仪表面皱缩粉体填料外露,未见基体树脂断裂。结论制备的 NRCFM1和 NRCFM2在不同溶液介质中均呈现良好的理化稳定性,具备新型树脂根管充填材料的基本理化性能。

Objective To synthesize a new resin root canal filling material （NRCFM） and evaluate its stability in water and artificial saliva. Methods The new root canal filling material was made of thermoplastic elastomer （TPE）, ethylene vinyl acetate（EVA） and activity fillers. The NRCFM＇s stability in water and artificial saliva with different pH values was assessed using gravimetric analysis, ICP and FE-SEM. Results NRCFM1 and NRCFM2 were successfully made. Gravimetric evaluation showed that the changes in mass over 30 days different solution medium for NRCFM1 and NRCFM2 were comparable to that of GP （ P 〉 0. 05 ） and significantly different from Resilon （ P 〈 0. 001 ）. ICP showed slight changes in Si concentration for NRCFM1 and NRCFM2, Zn for GP, Na and Si for Resilon in the alkaline artificial saliva （ pH 9.5 ）. GP and Resilon showed release of Zn and Na respectively in distilled water whereas NRCFM1 and NRCFM2 were stable. FE-SEM micrographs showed that there were slight changes on the surface topography of NRCFM1 and NRCFM2. Conclusions The new resin root canal filling material NRCFM1 and NRCFM2 had good stability in different experimental solutions.