藻酸盐印模新型消毒流程对模型精度的影响OA

Objective:An investigation into the effect of the alginate impression disinfection procedure,proposed in the Chinese Stomatological Association's group standard technical specifications for cleansing and disinfection of dental im-pressions,on model accuracy.Methods:Standard metric steel gauge block were used to prepare alginate impressions,totaling 10 groups.One group was not disinfected and served as a blank control group.There were three negative control groups,trea-ted with tap water for 10 min,20 min,and 30 min,respectively.The remaining 6 groups were treated with either 0.5%sodium hypochlorite solution or slightly acidic hypochlorous acid for disinfection,with exposure times of 10 min,20 min,and 30 min each.After pouring the model and allowing it to stand for 24 hours,the results were measured and statistically analyzed.Re-sults:The differences in measurement results among all groups(negative control group,0.5%sodium hypochlorite solution,and slightly acidic hypochlorous acid water)at different time points were significant(P<0.001),but the magnitude of change was extremely small.Pairwise comparisons revealed that the changes between 0 min and 10 min were statistically significant,whereas the changes between 10 min and 30 min were not significant.In intergroup comparisons at the same time points,no statistically significant differences were observed among the groups(P>0.05).Conclusion:According to the technical speci-fications for cleansing and disinfection of dental impressions recommended by the Chinese Stomatological Association,the dis-infection process for alginate impressions has been found to adversely affect the accuracy of the resulting models,but the actu-al difference was minimal and clinically acceptable.The new disinfectant,slightly acidic hypochlorous acid,showed no signifi-cant difference in its impact on model accuracy compared to the 0.5%sodium hypochlorite solution.