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Quintessence International



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Quintessence Int 39 (2008), No. 3     4. Feb. 2008
Quintessence Int 39 (2008), No. 3  (04.02.2008)

Online Article, Page 264, PubMed:18618030

Online Article: The influence of different disinfectants on primary impression materials
Bock, Jens Johannes / Fuhrmann, Robert Andreas Werner / Setz, Jürgen
Objective: To investigate the dimensional changes and the surface quality of dental impression materials after disinfection with 3 chemically different agents.
Method and Materials: Four alginate impression materials and 1 addition silicone material were selected. The impressions were made from a brass model simulating a 3-unit fixed partial denture. The chemical disinfection was performed with 3 different disinfectants for 10 minutes. Three samples of each impression material and disinfectant agent were investigated. As a control, 3 impressions of each material were made without any disinfection. The casts were made with a type IV dental stone. For each cast, 6 diameters and 3 distances were measured. To evaluate the dimensional stability, measurements were taken at a magnification of 343 with a light microscope. The surface quality was recorded using a profilometer.
Results: The dimensional change and surface quality differed minimally; however, statistically significant differences were found between alginate and addition silicone impression materials (ANOVA, P < .05). Casts from the silicone impressions were more accurate than the casts from alginate impressions.
Conclusion: Different impression disinfection methods have only a marginal influence on dimensional stability and surface quality of dental casts. To achieve a higher precision, the use of an addition silicone can be recommended.

Keywords: addition silicone, alginate, dental impression materials, dimensional stability, disinfection, surface quality