DOI: 10.36347/sjds.2017.v04i01.002

Pages: 6-13

Impression technique is one of the important factors that play a significant role in dimensional accuracy. The aim of this study is to compare dimensional stability of compound, alginate and dual alginate impression techniques. An acrylic resin model of edentulous mandible was prepared and a metal cone was placed (the standard cast) in the regions of first right and left molars and anterior midline point of the arch. Fifteen (15) impressions were made according to compound, alginate and dual alginate impression techniques. Each group of impressions was poured to create stone casts. The length and width of the casts were measured in mm by a digital caliper with an accuracy of 0.01 mm and compared to dimensions of the master model. The data were statistically analyzed utilizing one sample test and SPSS15 software. The results showed that the difference of mean length of experimental and the standard casts were found in compound (0.33±0.04), dual alginate (0.26±0.04) and alginate (0.21±0.03) impression techniques respectively, and the difference of mean width were found in compound (0.46±0.096), alginate (0.21±0.02) and dual alginate (0.15±0.054) impression techniques respectively (P<0.001). It can be concluded that the dimensional stability of the suggested dual alginate technique was approximately comparable to conventional alginate technique and had more acceptable dimensional stability than compound technique.