Comparative Study of Microleakage of Nanocomposite Resin Restoration Using Filled and Unfilled Adhesives

The purpose of this study was to evaluate the microleakage of nanofilled resin composite restorations when three adhesives that are filled adhesives : Adper ® Single Bond 2 and OptiBond ® Solo Plus and unfilled adhesive : Adper ® Single Bond of Two-step Total-etch System were used. Sixty Class V cavities (3 mm. width, 4 mm. length and 2 mm. depth) were prepared on buccal surface of extracted human molars. Occlusal margins were located in enamel whereas gingival margins were located in dentin or cementum. Prepared cavities were divided into 3 groups of 20 cavities and restored with a nanofilled resin composite Filtex ® Z 350 with one unfilled adhesive (Adper ® Single Bond) and two filled adhesives (Adper ® Single Bond 2 and OptiBond ® Solo Plus). The adhesives were used according to the manufacturers’ instructions. The teeth were stored in distilled water for 24 hours before subjected to thermocycling between 5-55 ° c for 500 cycles with dwell time of 20 seconds and then immersed in 2% methylene blue dye for 4 hours. Each tooth was longitudinally sectioned in bucco-lingual direction. The sectioned specimens were examined under Stereomicroscope at 35X magnification and recorded with Digital camera. The distance of dye penetration were measured using Image J program. The data were analyzed by One-way ANOVA test (p Microleakage was significantly less at occlusal margin than gingival margin (p Keywords:  microleakage, unfilled adhesive, filled adhesive