Objective:The accuracy of impression is achieved by the various physical properties of an impression material, which is described by parameter like dimensional stability. The purpose of this study was to determine the dimensional stability and the effect of immersion in the disinfection for new impression material "EXA'lence" compared with other elastomeric impression materials.
Methods: EXA'lence (EX,Monophase,GC), Aquasil Ultra (AU,Monophase,Dentsply), Imprint 3 (I3,Monophase,3MESPE), Take 1 Advanced (T1,Monophase,Kerr) and Impregum Penta (IG,3M ESPE) were evaluated in this study.
The specimen of linear dimensional change test was prepared according to ISO/4823:2000. After that, the specimens were stored with room environment(23°C, 50%HUM) for 24 hours and then immersed in 2% glutaraldehyde solution for 1 hour. The specimens were removed, and the linear dimensional change was measured using a Comparator (SIMADZU).
The test of discrepancy was executed by comparing stone die with master model made of stainless steel designed to simulate an abutment tooth. Each material was mixed and placed to the stainless steel mold. The specimens were cured in the water bath at 35±1°C and were removed after the manufacturers' indicated setting time. Then, the specimens were immediately demolded and poured after 24 hour. The discrepancies were measured using aProfile Projector (Mitutoyo).
The results were analyzed one-way ANOVA and Turkey test (p<0.05).
Results: The mean values were shown in the following table. In the table, asterisk (*) indicates significant difference (n=5, p<0.05) compared with EX in the same column. EX showed better mean values than the other materials.
| EX(S.D.) | AU(S.D.) | I3(S.D.) | T1(S.D.) | IG(S.D.) |
23°C,50%HUM(%) | -0.132(0.020) | -0.325(0.033)* | -0.234(0.045)* | -0.350(0.016)* | -0.442(0.082)* |
2%Glutaraldehyde(%) | -0.255(0.049) | -0.565(0.032)* | -0.274(0.057) | -0.451(0.093)* | -0.365(0.091) |
Discrepancy(mm) | -0.098(0.027) | -0.166(0.030)* | -0.140(0.036) | -0.168(0.033)* | -0.273(0.051)* |
Conclusion: "EXA'lence" has a better dimensional stability and compatibility than the other elastomeric impression materials.