Factors affecting dimensional instability of alginate impressions during immersion in the fixing and disinfectant solutions.
To clarify the factors determining the dimensional stability of alginate impressions during immersion in disinfectant and fixing solution, the weight change of impressions in solutions of glutaraldehyde (GA), NaClO, Na2SO4, K2SO4, CaCl2, and ZnSO4 was measured. In the nonelectrolytic solution, GA, the weight decreased in proportion to concentration, possibly due to the gradient of osmotic pressure between the impression and solution. In monovalent metallic salt solutions the weight change decreased with increased concentration. Especially at lower concentrations the rate of weight loss was high. A chemical action of the solution might also be involved, in addition to the osmotic pressure difference. The weight loss in divalent metallic salt solutions was greater than in monovalent solutions, implicating crosslinking reactions between the impression and solution.
Saito
S
S
Department of Dental Materials Science and Technology, Iwate Medical University School of Dentistry, Japan.
Ichimaru
T
T
Araki
Y
Y
D000464:Alginates / Q000737:chemistry*; D002122:Calcium Chloride / Q000737:chemistry; D019551:Dental Disinfectants / Q000737:chemistry*; D003760:Dental Impression Materials / Q000737:chemistry*; D005782:Gels; D005976:Glutaral / Q000737:chemistry; D009994:Osmolar Concentration; D012973:Sodium Hypochlorite / Q000737:chemistry; D012996:Solutions / Q000737:chemistry; D013431:Sulfates / Q000737:chemistry; D014783:Viscosity; D019287:Zinc Sulfate / Q000737:chemistry
D000464:Alginates; D019551:Dental Disinfectants; D003760:Dental Impression Materials; D005782:Gels; D012996:Solutions; D013431:Sulfates; C012036:sodium sulfate; C031512:potassium sulfate; D019287:Zinc Sulfate; D012973:Sodium Hypochlorite; D002122:Calcium Chloride; D005976:Glutaral