An in-vitro study of microleakage of nanofilled and nanohybrid dental composites

Objectives: To evaluate and compare the microleakage of dental restorations restored with nanofilled and nanohybrid composites and a “cheaper” nanohybrid composite.
Methods: Class V cavities (3 x 5 x 2 mm) were prepared in 30 non-carious human premolar teeth at the cement-enamel junction on the buccal surfaces. The teeth were restored with Filtek Supreme XTE nanofilled composite (3M), CeramX Mono nanohybrid (Dentsply) and Charmfil nanohybrid (Dentkist) was used to restore the teeth. Teeth were randomly divided into 3 groups and subjected to 200 cycles, dwell time 60s and temperatures ranges of 5°- 55°C in 0.5% methylene blue dye solution. Teeth were sectioned and examined under light microscope for dye penetration.
Results: In general, all materials had some dye penetration. Cochran-Mantel-Haenszel test showed significant differences between the groups (p<0.001) with Charmfil showing extensive dye penetration on both enamel and dentine sides. The least dye penetration was observed with the true nanofilled Filtek
Conclusions: The so called “cheaper” composite material Charmfil showed extensive dye penetration. Practitioners need to be aware of these properties before purchasing these cheaper products.