一种新型根尖充填材料的理化性能及细胞相容性研究

目的 制备一种新型根尖充填材料并对其理化性及细胞相容性进行研究.方法 采用天然羟基磷灰石、磷酸四钙、聚丙烯酸、柠檬酸及柠檬酸钠等材料制备成新型根尖充填材料样品,进行傅立叶红外光谱分析、X-射线衍射分析、固化时间及抗压强度等理化性能测试；并通过细胞培养,采用甲基噻唑基四唑(MTT)法和直接接触法检测材料的细胞相容性.结果 新型根尖充填材料的主要成分为羟基磷灰石及羧酸钙盐；其固化时间为(8.77 ±0.64) min;抗压强度为(28.87±3.88) MPa;材料的细胞毒性分级为O级或Ⅰ级,荧光显微镜观察发现L929在材料表面黏附、生长良好.结论 新型根尖充填材料具有良好的理化性能及细胞相容性,具有良好的临床应用前景.

Phvsico-chemical propties and in vitro cell compatibilitv of a novel root-end filling material

Objective To prepare a novel root end filling material and determine its physical and chemical properties and cell compatibility.Methods Samples of the novel root end filling material were developed with hydroxyapatite,tetracalcium phosphate,polyacrylic acid,citric acid and sodium citrate.Chemical composition of the new material was analyzed by Fourier transform infrared spectrophotometer (FTIR) and X-ray diffraction (XRD).Physical properties such as the setting time and compressive strength of the material were also investigated.The cytocompatibility was tested by MTT assay and direct contact assay.Results The novel root end filling material was primarily composed of HA,calcium carboxylate and calcium citrate.Its setting time was 8.77 ± 0.64 min and the compressive strength was ( 28.87 ± 3.88 )MPa at 1 day.The cytotoxicity scores of it in the serial dilution extract and different culture time ranked from grade 0 to Ⅰ.L 929 cells adhered on its surface and proliferated well.Conclusions With good physicalchemical properties and good cell compatibility,the novel root canal filling material presents a good clinical application prospect.