Resin-Modified Glass Ionomer — MFDS Part 1 MCQ
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Correct answer: A — Rapid command set and higher early strength
The correct answer is A. Resin-modified glass ionomer cement includes a polymerisable resin component, commonly HEMA, in addition to the conventional acid–base reaction. Light activation therefore produces a rapid command set and higher early strength, reducing vulnerability during the initial setting period. Both material classes can chemically adhere to enamel and dentine, so C is not a distinguishing advantage. RMGIC retains fluoride release, but it does not consistently provide greater or more sustained release than conventional GIC, excluding B. It is not generally cheaper because light-curing equipment is required. Greater biocompatibility is also incorrect: residual resin monomers, particularly HEMA, may increase cytotoxic potential compared with conventional GIC.
Reference: Wilson AD. Resin-modified glass-ionomer cements. International Journal of Prosthodontics. 1990;3(5):425–429. https://pubmed.ncbi.nlm.nih.gov/2088379/