title: Immersion disinfection of irreversible hydrocolloid impressions with sodium hypochlorite. Part II: Effect on gypsum.
abstract: This study investigated the effects of various immersion times and concentrations of sodium hypochlorite on irreversible hydrocolloid impressions and resultant gypsum casts. Irreversible hydrocolloid impressions of a test die were immersed for 1, 5, or 10 minutes in water (control), 5.25%, 0.525%, and 0.0525% sodium hypochlorite and then cast in a Type III stone and a Type V stone. Each stone specimen was evaluated for detail reproduction, dimensional change, surface roughness, and surface hardness. The results indicated that impressions may be immersed in sodium hypochlorite for any of the experimental times and concentrations without negative effects on Type V stone casts. However, immersion of impressions in 5.25% sodium hypochlorite causes some surface deterioration on Type III stone casts.
authors.affiliation: Department of General Dentistry, Wilford Hall Medical Center, Lackland Air Force Base, San Antonio, Texas.
authors.forename: K S
authors.initials: KS
authors.lastname: Vandewalle
authors.forename: D G
authors.initials: DG
authors.lastname: Charlton
authors.forename: R S
authors.initials: RS
authors.lastname: Schwartz
authors.forename: S E
authors.initials: SE
authors.lastname: Reagan
authors.forename: R G
authors.initials: RG
authors.lastname: Koeppen
mesh_terms: D000464:Alginates / Q000737:chemistry; D000704:Analysis of Variance; D002133:Calcium Sulfate / Q000737:chemistry*; D003760:Dental Impression Materials / Q000737:chemistry*; D004203:Disinfection / Q000379:methods*; D006244:Hardness; D017053:Infection Control / Q000379:methods; D003765:Models, Dental; D015203:Reproducibility of Results; D012973:Sodium Hypochlorite / Q000737:chemistry*; D013499:Surface Properties; D013997:Time Factors
chemical_list: D000464:Alginates; D003760:Dental Impression Materials; D012973:Sodium Hypochlorite; D002133:Calcium Sulfate