29: Resin-modified and resin cements

29

Resin-modified and resin cements

Figure 29.1 Bond strengths for conventional and adhesive resin cements.

c29-fig-0001


Box 29.1 Requirements of resin-modified and resin cements
Consistency and handling
Working and setting time
Film thickness
Radiopacity
Strength and wear resistance
Retention (bond strength)
Shade availability
Fluoride release

Table 29.1 Types of RMGI and their applications

Resin-modified glass ionomer Application
Type I Luting agents
Type II Filling materials
Type III Base/liner
Type IV Core buildup

Table 29.2 Components of liquid portion of RMGI cements

Component Function
Methacrylate resin Permits setting by polymerization
Polyacid Reacts with the glass causing setting by an acid–base reaction
Hydroxyethylmethacrylate (HEMA) Facilitates coexistence of resin and acid in aqueous solution and participation in polymerization
Water Essential for ionization of acid required for acid–base reaction

Table 29.3 Components of several RMGI cements

Product Powder–paste Liquid–paste
A Fluoroaluminosilicate glass + redox catalyst (encapsulated potassium persulfate + ascorbic acid) Aqueous solution of methacrylate-modified polycarboxylic acid + HEMA + tartaric acid + activator + water
B Fluoroaluminosilicate + borosilicate glasses Complex monomer with carboxylic acid groups + vinyl groups + water
C Fluoroal/>

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Jan 1, 2015 | Posted by in Dental Materials | Comments Off on 29: Resin-modified and resin cements
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