Resin modified glass Ionomers

Question 1

Name the powder components of RMGI

Answer 1

Fluoro-aluminium-silicate glass
Barium glass (provides radiopacity)
Vacuum dried polyacrylic acid
Potassium persulphate (dark cure resin)
Ascorbic acid 
Pigments

Question 2

Liquid components of RMGI

Answer 2

HEMA
Polyacrylic acid w/ pendant methacrylate (acid/base + polymerisation)
Tartaric acid (speeds up setting reaction)
Water (allows reaction between polyacid and glass)
Photoinitiators (allow light cure)

Question 3

Describe Dual Curing RMGI

Answer 3

• Undergoes Dissolution as normal
• Light activation causes free radical methacrylate reaction to occur
• acid base reaction for hardening

Question 4

Tri Curing RMGI setting reaction

Answer 4

• Normal Dissolution occurs
• redox reaction begins
• light activation - resin matrix formed
• redox continues
• acid base reaction for several hours
• final hardening over days