Aim: The aim of the study was to evaluate the dimensional accuracy of three combinations of polyvinyl siloxane impression material by double-mix single-step impression technique. Materials and methods: Metal master model was made according to the ADA specification no. 19; ISO 4823:2000/AMD 2007. Impressions were made using perforated custom-made metallic trays of 2 mm and 4 mm spacing, the impression materials used were putty, heavy body, regular body and light body. A total of 30 impressions were made by single-step technique and poured in die stone to obtain resultant cast. Ten impressions were made of each combination of polyvinyl siloxane (PVS). Three dimensions (interabutment distance, height and diameter) on resultant cast were measured and compared with metal master model. The results were statistically analyzed and tabulated. Results: Diameter of abutment, the height of abutment and interabutment distance in each group were larger in dimensions as compared with metal master model. The dimensional discrepancies of group I, group II and group III casts when compared with the master model were significantly different from each other. The least difference was found in group I. Conclusion: The one-step putty–light body combination (group I) produced the most accurate stone casts compared with one-step heavy body–light body and regular body–light body combinations. Clinical significance: In everyday dental practice, impression making is imperative. Hence, by doing this study, we tried to find out which material combination is suitable to give us predictable and accurate results.
Walker MP, Ries D, Borello B. Implant cast accuracy as a function of impression techniques and impression materials viscosity. Int J Oral Maxillofac Implants 2008;23(4):669–674.
Singh K, Sahoo S, Prasad KD, et al. Effect of different impression techniques on the dimensional accuracy of impressions using various elastomeric impression materials: an in vitro study. J Contemp Dent Pract 2012;13(1):98–106.
Pandey A, Mehtra A. Comparative study of dimensional stability and accuracy of various elastomeric materials. IOSR Journal of Dental and Medical Sciences2014;13(3):40–44.
Mahalaxmi S. Materials used in dentistry. 1st ed., Wolters Kluwer (India) Pvt. Ltd; 2013.
Raigrodski AJ, Dogan S, Mancl LA, et al. A clinical comparison of two vinyl polysiloxane impression materials using the one-step technique. J Prosthet Dent 2009;102(3):179–186.
Rosenstiel S, Land M, Fujimoto J. Contemporary fixed prosthodontics. 4th ed., Mosby-Elsevier; 2011.
Gordon GE, Johnson GH, Drennon DG. The effect of tray selection on the accuracy of elastomeric impression materials. J Prosthet Dent 1990;63(1):12–15.
Hung SH, Purk JH, Tira DE, et al. Accuracy of one-step versus two-step putty wash addition silicone impression technique. J Prosthet Dent 1992;67(5):583–589.
Idris B, Houston F, Claffey N. Comparison of the dimensional accuracy of one and two-step techniques with the use of putty/wash addition silicone impression material. J Prosthet Dent 1995;74(5):535–541.
Kumar V, Aeran H. Evaluation of effect of tray space on the accuracy of condensation silicone, addition silicone and polyether impression materials: an in vitro study. J Indian Prosthodont Soc 2012;12(3): 154–160.
Franco EB, da Cunha LF, Benetti AR. Effect of storage period on the accuracy of elastomeric impressions. J Appl Oral Sci 2007;15(3): 195–198.
Balkenhol M, Ferger P, Wöstmann B. Dimensional accuracy of 2-stage putty-wash impressions: influence of impression trays and viscosity. Int J Prosthodont 2007;20(6):573–575.
Nissan J, Laufer BZ, Brosh T, et al. Accuracy of three polyvinyl siloxane putty-wash impression techniques. J Prosthet Dent 2000;83(2): 161–165.
Corso M, Abanomy A, Canzio JD, et al. The effect of temperature changes on the dimensional stability of polyvinyl siloxane and polyether impression materials. J Prosthet Dent 1998;79:626–631.
Petersen GF, Asmussen E. Distortion of impression material used in the double mix techniques. Scand J Dent Res 1991;99:343–348.
Johnson GH, Craig RG. Accuracy of four types of rubber impression materials compared with time of pour and a repeat pour of models. J Prosthet Dent 1985;53(4):484–490.
Linke BA, Nicholls Ji, Faucher RR. Distortion analysis of the stone casts made from impression materials. J Prosthet Dent 1985;54(6): 794–802.
Lacy AM, Fukui H, Bellman T, et al. Time dependent accuracy of elastomeric impression materials. Part II: polyether, polysulfide and polyvinylsiloxane. J Prosthet Dent 1981;45(3):329–333.
Cayouette MJ, Burgess JO, Jones RE, et al. Three dimensional analysis of dual arch impression trays. Quintessence International 2003;34(3):189–198.
Franco EB, da Cunha LF, Herrera FS, et al. Accuracy of single-step versus 2-step double-mix impression technique. ISRN Dent 2011;34:15–46.
Hassan AK. Dimensional accuracy of 3 silicone dental impression materials. East Mediterr Health J 2006;12:632–636
Kumari N, Nandeeshwar DB. The dimensional accuracy of polyvinyl siloxane impression materials using two different impression techniques: An in vitro study. J of Ind Prosthodontic Soc 2015;15(3):211–217.