- Traditional glass ionomer is significantly weaker than composite resin. It is much more likely to wear or fracture.
- Traditional glass ionomer does not match your tooth color as precisely as composite resin.
- A resin-modified glass ionomer filling needs to be applied in thin layers. Each layer must be cured, or hardened, with a special bright blue light. Then the next layer can be added. This makes the tooth stronger, but can lengthen the time of the dental appointment.
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