Abstract:
:To elucidate the mechanism of dimensional changes in alginate impression in solutions, the relationship between the ion concentrations in three types of solutions (nonelectrolyte and monovalent and divalent metallic salts) and change in gel volume was examined. The gel in the monovalent metallic salt solution expanded and a decrease in monovalent cation and an increase in Ca2+ were observed. This suggests that the crosslinking density of the gel reduced due to dissociation of Ca2+ from the calcium alginate gel. In divalent metallic salt solutions, the shrinkage occurred according to crosslinking of unreacted residue. In the nonelectrolytic solution, gel, neither ethylene glycol nor acetonitrile showed any volume changes, while that in glutaraldehyde contracted. It is speculated that the former two solutions were affected by the fact that the gel has no semipermeability, and that the latter result was due to chemical interaction between the gel and solution.
journal_name
Dent Mater Jjournal_title
Dental materials journalauthors
Saitoh S,Araki Y,Kon R,Katsura H,Taira Mdoi
10.4012/dmj.19.396keywords:
subject
Has Abstractpub_date
2000-12-01 00:00:00pages
396-404issue
4eissn
0287-4547issn
1881-1361journal_volume
19pub_type
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