Fluoride release from glass ionomer-lined amalgam restorations

Area of Science:

• Dental Materials Science
• Biomaterials Research
• Restorative Dentistry

Background:

• Amalgam restorations are widely used in dentistry.
• Glass ionomer cements (GICs) are utilized as liners beneath amalgam restorations.
• Fluoride release from GICs may offer cariostatic benefits.

Purpose of the Study:

• To quantify and compare fluoride release from different glass ionomer cements when used as liners in amalgam restorations.
• To evaluate the fluoride release profiles of Ketac-Bond, Ketac-Silver, and Chelon-Silver GICs over a four-week period.

Main Methods:

• Fifty human molars were prepared with Class V cavities and restored with amalgam, with or without GIC liners.
• Teeth were divided into five groups: control, amalgam only, and amalgam with Ketac-Bond, Chelon-Silver, or Ketac-Silver liners.
• Fluoride release was measured weekly for four weeks using a fluoride-ion electrode after thermocycling.

Main Results:

• Ketac-Bond GIC released significantly more fluoride than Ketac-Silver and Chelon-Silver at one week (P < 0.01).
• At four weeks, Ketac-Bond continued to show significantly higher fluoride release (P < 0.01).
• No significant difference in fluoride release was observed between Ketac-Silver and Chelon-Silver at four weeks.

Conclusions:

• Glass ionomer cement liners significantly influence fluoride release from amalgam restorations.
• Ketac-Bond exhibits a superior fluoride-releasing capacity compared to Ketac-Silver and Chelon-Silver over four weeks.
• The choice of GIC liner can impact the potential for localized fluoride delivery in restorative dentistry.