颌面部赝复用硅橡胶老化后体外细胞毒性研究

目的 研究颌面部赝复用硅橡胶老化后的体外细胞毒性.方法 以A-2186硅橡胶和液态双组份SEI硅橡胶作为受试材料,根据GB/T3512-2001分别制备24、48、72 h老化试件.以小鼠成纤维细胞(L-929)培养液为浸提介质,参照GB/T16886.5-2003制备相应浓度的浸提液培养L-929细胞.根据试件的老化时间和浸提液的浓度进行实验分组,同时设立阴性和阳性对照.于加入浸提液后的2、4、7 d分别收集细胞,MTT法检测细胞增殖,以测得的吸光度值(D490nm)计算细胞相对增殖率并以此评价受试件的毒性程度.结果 加入浸提液后2、4 d,SEI老化72 h 50%和100%浓度组的D490nm均较阴性对照组显著降低,评价细胞毒性为2级.加入浸提液后7 d,A.2186老化48 h 100%浓度组及老化72 h 50%和100%浓度组的D490nm均较阴性对照组显著降低,评价细胞毒性均为2级;SEI老化48 h 50%和100%浓度组及老化72 h 50%和100%浓度组的D490nm均较阴性对照组显著降低,评价细胞毒性均为2级.除A-2186老化24 h 50%浓度组外(细胞毒性为0级),其余各组细胞毒性评价均为1级.结论 老化48 h后,液态双组份SEI硅橡胶表现出轻微的细胞毒性;老化72 h后,A-2186硅橡胶和液态双组份SEI硅橡胶均有一定的细胞毒性.建议临床使用赝复体的患者定期更换赝复体.

In vitro cytotoxicity test on aging silicone for maxilloficial prosthesis

Objective To study the in vitro cytotoxicity of aging silicones for maxillofacial prosthesis.Methods A-2186 and SEI silicone specimens were accelerated aging for 24,48,72 h in an aging box according to GB/T3512-2001.The DMEM medium used as culture liquid of L-929 fibroblast was the liquid extraction.In vitro cytotoxicity of these two kinds of silicone aging for 24 h,48 h,72 h and the normal controls were tested to evaluate the biological properties of the aging silicone of the A-2186 and SEI silicone prelim...