The Effect of disinfection of Extended-Pour alginate impressions on the surface roughness of stone casts

The study aimed to estimate the influence of disinfection of impression material (Hydrogum
5 extended-Pour alginates) on the surface roughness of the resulting casts. Materials and Methods: In this study, 40 alginate impressions using Hydrogum 5 extended-Pour alginates. The impressions were divided into four groups according to different time of storage and pouring intervals: one, six, 12 and 24 hours. Each time interval has ten impressions which were divided into two groups (control and study) each group has five impressions which stored in sealed plastic bags then casting with dental stone. In control groups the impressions stored without disinfection and in study groups the impressions were sprayed with (AHD 2000) ready-made commercial disinfectant material then stored. Surface roughness test was measured for every specimen by (Mahr) Marsurf PS1Data analysis were done by Student T- test and ANOVA (P<0.05).Results: Extended-Pour alginates not significantly affected the surface roughness of the stone casts either with or without disinfection. Conclusion: This study demonstrated that casting may be postpone up to 24 hours using Hydrogum 5 extended-Pour alginates. likewise pouring after disinfectant.