title: The effect of immersion disinfection procedures on dimensional stability of two elastomeric impression materials.
abstract: The aim of this study was to determine the effect of immersion disinfection procedures on the dimensional stability of two elastomeric impression materials. Impressions of a stainless steel die were made with polyether (PE) and with addition-polymerized silicone rubber (PVS). The test specimens underwent disinfection treatment by immersion in two commercially available solutions containing quaternary ammonium compounds (Sterigum Powder, SP) and glutaraldehyde plus an amino derivative (MD520, MD), respectively. The impressions were measured at 4 different time points: before any disinfection treatment (T0); after the first disinfection (T1); 6 hours after the first disinfection (T2); after the second disinfection, carried out 6 hours after the first one (T3). Impressions which were not disinfected served as controls. When both impression materials were disinfected with SP, significant differences were detected among all measurements (P < 0.0001), with the exception of T2 vs T3 (P > 0.05). On the other hand, when MD was used, significant differences were found when T0 measurement was compared to T1, T2 and T3 measurements (P = 0.0043 for PE, and P = 0.0014 for PVS). The dimensional change of all material/disinfectant combinations was always <or=0.5%. Therefore, the effects of immersion disinfection on the dimension of elastomers in SP or MD are not clinically relevant.
authors.affiliation: Department of Oral Sciences, University of Palermo, Palermo, Italy.
authors.forename: Dario
authors.initials: D
authors.lastname: Melilli
authors.forename: Antonio
authors.initials: A
authors.lastname: Rallo
authors.forename: Angelo
authors.initials: A
authors.lastname: Cassaro
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Pizzo
mesh_terms: D019551:Dental Disinfectants / Q000737:chemistry*; D003760:Dental Impression Materials / Q000737:chemistry*; D004203:Disinfection / Q000379:methods*; D020724:Elastomers / Q000737:chemistry*; D005976:Glutaral / Q000737:chemistry; D006801:Humans; D007101:Immersion; D008422:Materials Testing; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D012117:Resins, Synthetic / Q000737:chemistry; D012826:Silicone Elastomers / Q000737:chemistry; D013499:Surface Properties; D013997:Time Factors
chemical_list: D019551:Dental Disinfectants; D003760:Dental Impression Materials; D020724:Elastomers; C022821:Impregum; D000644:Quaternary Ammonium Compounds; D012117:Resins, Synthetic; D012826:Silicone Elastomers; D005976:Glutaral