Abstract
The aim of this in vitro study was to compare the microleakage values of a nano-resin modified glass ionomer, nano-composite alone and in contact with nano-resin modified glass ionomer base (sandwich technique) versus conventional-resin modified glass ionomer and conventional-composite in primary molars. Methods: Seventy five extracted primary molars were selected, and class V cavities were prepared on the buccal/lingual surfaces. Teeth were randomly distributed to 5 groups according to the type of restorative materials (n=15). Group 1: nano-resin modified glass ionomer (nano-RMGI) Group 2: nano-composite. Group 3: nano-resin modified glass ionomer (nano-RMGI) as a base followed by bonded nano- composite as a sandwich technique. Group 4: conventional- resin-modified glass ionomers (conv-RMGI). Group 5: conventional- composite. After thermocycling assessment of gap surface area was done. The teeth were immersed in basic fuchin dye then sectioned and evaluated under a stereomicroscope. Microleakage was assessed using linear dye penetration in (mu m) and on a scale from zero to three. Results: There was statistically significant difference between the five groups gap surface area and gap surface fraction. Nano-RMGI /nano composite sandwich technique group exhibited the lowest value followed by nano composite group while conv-RMGI showed the highest value. Regarding linear dye penetration and microleakage scores, no significant differences were found between the tested materials. The degree of leakage in the gingival margins was significantly higher than that of occlusal margins for nano-RMGI, nano-RMGI / nano-composite and conv -RMGI groups. Conclusion: Complete marginal sealing could still not be reached with any of the tested restorative materials. Nano-RMGI /nano-composite sandwich technique showing the least microleakage followed by nano-composite when compared to the other four materials tested. [Eman A. El-Ashiry; Niveen S. Bakry; Najat Farsi and Deema Farsi. Microleakage Evaluation of Two Different Nano-Restorative Materials in Primary Molars: In Vitro Study. Life Sci J 2012;9(3):2242-2250]. (ISSN:1097-8135). http://www.lifesciencesite.com. 401