不同排龈剂对加成型硅橡胶印模材阻聚作用的影响

Effect of different kinds of gingival retraction agents on the polymerization inhibition of polyvinyl siloxane impression materials

目的:研究不同种类排龈剂直接接触加成型硅橡胶印模材后,对其阻聚作用及阻聚程度的影响。方法:选择5种排龈剂(0.1%盐酸肾上腺素、0.05%羟甲唑啉、15.5%硫酸铁、25%氯化铝和5%氯化铝),生理盐水作为对照,2种加成型硅橡胶印模材(Express^(TM),Imprint^(TM) Ⅱ),共组合成12组,每组12个样本,共144个样本。由同一名操作者用硅橡胶印模材混合枪将硅橡胶印模材混合于亚克力模具中,使其直接接触密织棉织物上的排龈剂,到达厂家所示的聚合时间后取下样本,置于放大倍数为10倍的体视显微镜下,观察样本是否发生阻聚,并比较其阻聚程度。采用SPSS22.0软件包对数据进行统计学分析。结果:2种加成型硅橡胶印模材的阻聚均发生于15.5%硫酸铁组和25%氯化铝组,阻聚发生率为100%;与对照组相比,差异有统计学意义(P<0.05)。0.1%盐酸肾上腺素组、0.05%羟甲唑啉组和5%氯化铝组均未发生阻聚,15.5%硫酸铁和25%氯化铝对Imprint^(TM)阻聚程度的影响大于Express^(TM),差异有统计学意义(P<0.05)。结论:在使用加成型硅橡胶印模材取模时,要注意含15.5%硫酸铁和25%氯化铝2种成分的排龈剂对其聚合的影响。取模前,要将排龈剂冲洗干净,避免残留物直接接触硅橡胶引起阻聚。

PURPOSE:To evaluate the effect of different kinds of gingival retraction agents after directly contacted with polyvinyl siloxane impression materials on polymerization inhibition and the inhibition degree.METHODS:Five kinds of gingival retraction agents(0.1%epinephrine hydrochloride,0.05%oxymetazoline,15.5%ferric sulfate,25%aluminum chloride and 5%aluminum chloride)were chosen,normal saline was as control group,and two kinds of polyvinyl siloxane impression materials(ExpressTM,ImprintTMⅡ)were combined into 12 groups.There were 12 specimens in each group and 144 specimens in total.Silicone rubber impression materials were mixed by the same operator using a dispensing gun into the acrylic mold,so that they could directly contact the gingival retraction agents on the densely woven cotton fabrics.The samples were removed when the polymerization time arrived according to the manufactures’recommendations and then placed under a stereomicroscope with a magnification of 10 times to observe whether polymerization inhibition occurred,the degree of inhibition was compared afterwards.SPSS 22.0 software package was used for statistical analysis.RESULTS:The polymerization inhibition of two kinds of silicone rubber impression materials occurred in 15.5%ferric sulfate group and 25%aluminum chloride group,and the inhibition occurrence rate was 100%,the difference was statistically significant(P<0.05)compared with normal saline group.Inhibition was not found in 0.1%epinephrine hydrochloride group,0.05%oxymetazoline group and 5%aluminum chloride.The effect of 15.5%ferric sulfate and 25%aluminum chloride on polymerization inhibition degree of ImprintTMⅡwas greater than ExpressTM,and the difference was statistically significant(P<0.05).CONCLUSIONS:When silicone rubber impression material is used during impression procedure,attention should be paid to the effect of the gingival retraction agent containing 15.5%ferric sulfate and 25%aluminum chloride on its polymerization.The gingival retraction agent should be washed before impression to avoid the residue directly contacting the silicone rubber to prevent polymerization.