新型树脂根管充填材料的制备与性能

以热塑性聚烯烃弹性体（TPE）和乙烯 醋酸乙烯酯共聚物（EVA）为基体树脂， 硫酸钡（BaSO₄）、气相白炭黑（气相SiO₂）和羟基磷灰石（HA）为无机填料， 制备了新型树脂根管充填材料（NRCFM）， 着重对NRCFM 的组成进行了筛选与优化， 并对NRCFM在pH值为7.0和9.5的人工唾液介质中的稳定性进行了研究。实验结果表明， NRCFM的最佳组成为: TPE 30 g、EVA 5 g、BaSO₄45 g、 气相SiO2 10 g、 HA 10 g， 由此制备的NRCFM具有适宜的力学性能和优异的耐介质稳定性， 其邵氏A硬度88.9、 拉伸强度1.99 MPa、 断裂伸长率457％， 在pH值为7.0和9.5的人工唾液介质中浸泡30天后的质量变化小于0.5％。 

Preparation and properties of new resin root canal filling materials

The new resin root canal filling materials (NRCFM) were prepared by using thermoplastic elastomer (TPE) and ethylene-vinyl acetate copolymer (EVA) as matrix resin，BaSO4，fumed SiO2 and hydroxyapatite (HA) as inorganic fillers and its compositions were emphatically selected and optimized. The stability of NRCFM in artificial saliva with pH 7.0 and 9.5 was also investigated. The results show that the optimal composition of NRCFM is：TPE 30g，EVA 5 g，BaSO4 45 g，SiO2 10g，HA 10g. NRCFM prepared at this optimal composition has the appropriate mechanical property and excellent resistant-medium stability:  Shore A hardness is 88.9,  tensile strength is 1.99 MPa and elongation at break is 457%. After soaking 30 days in both pH 7.0 and pH 9.5 artificial saliva，mass change of NRCFM is less than 0.5%.