title: Hydrophilicity of unset and set elastomeric impression materials.
abstract: The aim of this study was to compare the initial hydrophilicity of unset and set elastomeric impression materials. Initial water contact angles were studied on thin unset and set films of one polyether and six polyvinyl siloxane (PVS) impression materials using high-resolution drop shape analysis at drop ages of 1 and 3 seconds. All unset PVS materials were very hydrophobic initially but showed different kinetics of hydrophilization. In contrast, the unset polyether was more hydrophilic initially but lacked distinct hydrophilization. All impression materials showed statistically significant contact angle differences between unset and set surfaces (P < .05). Dependent on the drop age, two PVS materials reached or exceeded the hydrophilicity of the polyether (P < .05). It can be concluded that studies on the wetting behavior of elastomeric impression materials should consider both the experimental drop age and set and unset material surfaces.
authors.affiliation: Section of Medical Materials and Technology, Department of Prosthodontics, University Hospital Tübingen, Oslanderstrasse 2-8, Tübingen, Germany. frank.rupp@med.uni-tuebingen.de
authors.forename: Frank
authors.initials: F
authors.lastname: Rupp
authors.forename: Jurgen
authors.initials: J
authors.lastname: Geis-Gerstorfer
mesh_terms: D003760:Dental Impression Materials / Q000737:chemistry*; D020724:Elastomers / Q000737:chemistry*; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D008422:Materials Testing; D011145:Polyvinyls / Q000737:chemistry; D012117:Resins, Synthetic / Q000737:chemistry; D012833:Siloxanes / Q000737:chemistry; D013997:Time Factors; D017155:Wettability
chemical_list: D003760:Dental Impression Materials; D020724:Elastomers; C022821:Impregum; D011145:Polyvinyls; D012117:Resins, Synthetic; D012833:Siloxanes; C480691:aquasil; C034183:vinyl polysiloxane