Pulp reactions to light-cured glass ionomer cements

Area of Science:

• Dental Materials Science
• Biomaterials
• Restorative Dentistry

Background:

• Glass ionomer liners are used in dental restorations to protect the pulp.
• Evaluating the biocompatibility of new dental materials is crucial.

Purpose of the Study:

• To compare the pulpal responses to two light-cured glass ionomer liners against a chemically-set glass ionomer and zinc oxide-eugenol (ZOE).

Main Methods:

• Deep Class V cavities were prepared in beagle dogs.
• Teeth were lined with Vitrebond, X-R Ionomer, GC lining cement, or ZOE.
• Cavities were restored with resin composite, and pulpal tissues were evaluated histologically at 1, 4, and 12 weeks.

Main Results:

• Pulpal reactions to the light-cured glass ionomer liners were minimal.
• These reactions were comparable to those seen with chemically-cured glass ionomer and ZOE.
• Bacteria were found in only nine specimens, with one showing a moderate pulp reaction.

Conclusions:

• Light-cured glass ionomer liners exhibit minimal pulpal reactivity.
• Their biocompatibility is comparable to established lining materials like chemically-cured glass ionomer and ZOE.