纳米载银基托树脂的生物相容性评价

目的:研究纳米载银基托树脂的生物相容性,为纳米载银基托树脂的临床应用提供生物学依据.方法:根据中华人民共和国医药行业标准,用分子滤过法检测纳米载银抗菌剂--载银磷酸复盐STR-1质量分数分别为5 g/L和10 g/L的纳米载银基托树脂的细胞毒性,并测定含两种不同质量分数抗菌剂STR-1的基托树脂与抗菌剂粉体STR-1的溶血率.结果:不含抗菌剂的对照组基托树脂、抗菌剂质量分数分别为5 g/L和10 g/L的纳米载银基托树脂对小鼠成纤维细胞L929无毒性作用,细胞培养第2小时及第24小时,对照组和实验组滤膜染色均匀,呈蓝色,染色密度无变化,褪色面积为0 mm²,毒性分级均为0级.抗菌剂粉体STR-1、含5 g/L和10 g/L抗菌剂的载银基托树脂溶血率分别为1.7%,3.5%和3.7%,溶血率均小于国家医药行业标准规定的5%,为无溶血作用.结论:抗菌剂STR-1含量分别为5 g/L和10 g/L的纳米载银基托树脂具有较好的生物相容性,具备了临床应用的前提.

Biocompatibility test of polymethylmethacrylate denture base resin containing silver-supported antimicrobial agent STR-1 at nanometer level

Objective: To evaluate the biocompatibility of polymethylmethacrylate(PMMA) denture base resin containing silver-supported antimicrobial agent STR-1 of nanometer level in vitro. Methods: According to the national standards for biological evaluation of dental materials, the cytotoxicity of denture base resin containing STR-1 at concentrations of 5 g/L and 10 g/L was examined by molecular filtrating method, and the hemolysis of STR-1, denture base resin containing STR-1 at concentrations of 5 g/L and 10 g/L was also surveyed. Results: The control denture base resin without containing STR-1 and the denture base resins containing STR-1 at concentrations of 5 g/L and 10 g/L were not cytotoxic to L929 cells. Two hours and 24 hours after cell culturing, the filter membranes of the control and experimental groups were stained evenly with blue color. The staining intensity was not decreased and the fading areas were 0 mm~2 during the culturing. The cytotoxicity grades were 0. The hemolysis rates of the antimicrobial agent STR-1 and the denture base resins containing STR-1 at concentrations of 5 g/L and 10 g/L were 1.7%, 3.5% and 3.7% respectively. They were less than the national guild standard 5% which represent no hemolysis. Conclusion: The PMMA denture base resins containing silver-supported antimicrobial agents STR-1 of nanometer level at concentrations of 5 g/L and 10 g/L exhibit good biocompatibility.