SETTING REACTION of Glass Ionomer Cement(GIC)

By Dr.Swathi Pai on Tuesday 29 April 2008 with 0 comments




Decomposition: acid attacks the glass powder, releasing Ca, Al, Na and F ions


Migration: acid penetrates the disorganized glass and reacts first with the Ca and Na to form cross-linked

chains that form a polysalt

Gelation: after surface layer loses almost all of its metallic ions, it forms a silica gel; very sensitive to water

now

Post-set Hardening: Al becomes the dominant component; Al precipitation continues for over 24 hrs.

Maturation: setting process continues for about a year; over the first few days, the transparency increases


Category: Conservative and Endodontics Notes

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