Dental composites/glass ionomers: the materials

Area of Science:

• Materials Science
• Biomaterials Engineering
• Dental Materials

Background:

• Commercial dental composites utilize dimethacrylate monomers and silica fillers, but suffer from limited durability (3-10 years) and polymerization shrinkage.
• Inadequate adhesion to cavity walls and potential pulp irritation are significant drawbacks of current dental composites.
• Glass-ionomer cements (GICs), introduced in the 1970s, are explored as a potential lining material for resin composite restorations.

Purpose of the Study:

• To review the limitations of current dental composites.
• To explore the composition and properties of glass-ionomer cements (GICs).
• To understand the potential of GICs as an alternative or adjunct in dental restorations.

Main Methods:

• Review of existing literature on dental composite materials.
• Analysis of the chemical composition and setting reaction of glass-ionomer cements.
• Discussion of the advantages and disadvantages of GICs compared to traditional composites.

Main Results:

• Dental composites exhibit polymerization shrinkage and adhesion issues, impacting restoration longevity.
• Glass-ionomer cements form an adhesive gel matrix through an acid-base reaction, releasing ions like aluminum and calcium.
• Hybrid GIC formulations with added polymers show improved physical properties and reduced brittleness.

Conclusions:

• GICs present a viable alternative or complementary material for dental restorations due to their adhesive properties.
• Further research into GIC formulations may overcome limitations of current dental composites.
• Proper management of water balance is crucial for GIC restoration integrity in the initial 24 hours.