Abstract

Objectives: This study was done for assessing dimensional stability and accuracy of an addition silicon impression material with autoclaving.

Methods: 20 impressions for a master model is done with heat resisting plastic trays. The 20 impressions were divided into 2 groups regarding the how they are disinfected: Group 1: (number = 10) Control group, undisinfected impressions (C.G), Group 2: (number = 10) impressions were autoclaved (A.G). Then, pouring was done using extra hard stone (type IV), casts were produced. Impressions dimensional stability and accuracy were assessed indirectly by casts reproduced from impressions taken to the master model by the use of travelling microscope.

Results: Cross arch distance (A): resin master model cross arch distance (A) was (41.36 mm). Cross-arch distance of stone casts Control group (C.G): was 41.553 ± 0.170 mm. Autoclaving group (A.G): distance (A) in stone models was 41.718 ± 0.242 mm. ANOVA proved statistically significant different shrinkage between groups (P-value= 0.006). Dimensional changes in the cross-arch distance of the groups. Cross arch distance changes in stone models of C.G. was 0.191 ± 0.170 mm. dimensional changes in models with A.G. was 0.365 ± 0.242 mm.

Conclusion: Autoclaving of polyvinyl siloxane impression does not affect its accuracy.

Keywords: Sterilization; Silicone; Stability

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