Gallium alloy restorations in primary teeth: a 12-month study

Area of Science:

• Dental Materials Science
• Pediatric Dentistry
• Corrosion Science

Background:

• Dental restorations in primary teeth require durable and safe materials.
• Gallium alloys are explored as alternatives to mercury-containing dental amalgam.
• Assessing the clinical performance and longevity of novel restorative materials is crucial.

Purpose of the Study:

• To evaluate the clinical performance and corrosion resistance of a gallium alloy in primary molar restorations.
• To assess the marginal integrity and surface deterioration of gallium alloy restorations over one year.
• To determine the suitability of this gallium alloy as a restorative material for pediatric patients.

Main Methods:

• Placement of 60 Class I and Class V restorations using a gallium alloy in primary molars of children aged 4-10 years.
• Clinical evaluation of restoration surfaces and marginal integrity over a one-year period.
• Analysis of retrieved restorations for corrosion products after tooth extraction or loss.

Main Results:

• Significant surface deterioration due to corrosion observed in all restorations within one year.
• Remarkable amounts of corrosion products found on retrieved restorations.
• Slight marginal deterioration in Class I restorations; no marginal breakdown in Class V restorations.
• No other adverse effects detected after one year.

Conclusions:

• The tested gallium alloy demonstrated insufficient corrosion resistance for long-term use as a permanent restorative material.
• The alloy's poor corrosion resistance limits its application in pediatric dental restorations.
• While not suitable as a permanent material, the alloy could be considered for primary teeth to minimize mercury exposure, pending further research on durability.