Microleakage of three generically different fluoride-releasing liner/bases

Area of Science:

• Dental Materials Science
• Restorative Dentistry
• Biomaterials

Background:

• Fluoride-releasing materials are crucial for preventing secondary caries.
• Dental liners and bases protect the pulp and enhance restoration longevity.
• Microleakage remains a significant challenge in restorative dentistry, potentially leading to recurrent decay.

Purpose of the Study:

• To evaluate and compare the microleakage performance of three distinct fluoride-releasing liner/base materials.
• To assess the tracer penetration and bulk absorption characteristics of each material.
• To determine the suitability of different materials for specific clinical applications, particularly in caries-vulnerable and non-visible areas.

Main Methods:

• Three types of fluoride-releasing materials were tested: a light-cured liner/base (Group 1), a traditional glass ionomer (Group 2), and a light-cured glass ionomer (Group 3).
• Microleakage was assessed on enamel and dentine preparations.
• Tracer penetration and bulk absorption were quantified for each material group.

Main Results:

• Group 1 (light-cured liner/base) exhibited significantly higher microleakage compared to Group 2 (traditional glass ionomer) and Group 3 (light-cured glass ionomer).
• Group 1 also demonstrated less bulk absorption of the tracer substance.
• The observed responses correlated with the known chemical properties of the tested materials.

Conclusions:

• Traditional glass ionomers and light-cured glass ionomers (Groups 2 and 3) are superior to light-cured liners (Group 1) in preventing microleakage.
• Materials with lower microleakage, such as glass ionomers, are recommended for use at caries-vulnerable margins that are difficult to inspect visually.
• Understanding material chemistry is key to predicting performance in clinical scenarios like microleakage prevention.