THE EFFECT OF HYDROXYAPATITE TOOTHPASTE ON MICROLEAKAGE OF CLASS II COMPOSITE RESIN RESTORATIONS IN PRIMARY MOLARS

Abstract

The study aimed to compare microleakage of Class II composite resin restorations in primary molars following the use of 1,500-ppm fluoride toothpaste and hydroxyapatite toothpaste. Class II cavities were prepared on the sound proximal surfaces of extracted primary molars and restored with composite resin. The specimens were subjected to thermocycling for 10,000 cycles and randomly assigned to two groups according to the type of toothpaste (n = 10 per group): group 1 1,500-ppm fluoride toothpaste and group 2 hydroxyapatite toothpaste. Subsequently, the specimens were subjected to a 7 days pH-cycling at 37°C. Microleakage was evaluated using a dye penetration method by immersing the specimens in 0.5% basic fuchsin solution for 24 hours. The teeth were then sectioned through the middle of the restorations and examined under a stereomicroscope to measure the depth of dye penetration. Statistical analysis was performed using the Mann-Whitney U test at a significance level of 0.05. The results revealed that the microleakage proportion in the hydroxyapatite toothpaste group was not significantly different from the 1,500-ppm fluoride toothpaste group (p > 0.05).

Keywords: Microleakage, Resin Composite, Primary Molar, Hydroxyapatite Toothpaste