Abstract
Aims: To measure the shear bond strength of three dental adhesive systems, self-etching priming sys-tem (Clearfil SE Bond), total-etch adhesive system (Prime &Bond NT) and all-in one adhesive (Etch & Prime 3.0 (E&P)), also to compare the effects of aging restorations with different time intervals (1-day, 1-week and 1-month) on dentin bond strength at room temperature. Materials and Methods: One hundred and eight human molars were embedded in self-cured acrylic resin, abraded on a water-cooled and polished with 80-400 grit sand papers to obtain standard dentin surfaces. The specimens were ran-domly assigned into three groups: (36 teeth) for Clearfil SE Bond, (36) for Prime&Bond NT and (36) for Etch & Prime 3.0 (E&P) adhesive systems were used at room temperature. These adhesive systems were applied to dentin surface according to the manufacturers’ instructions. A composite resin (Tetric composite resin (USA)) cone was bonded to dentin surface. These groups were sub-divided into 3 sub-groups (n=12), as in the following: (36) for Clearfil SE Bond; (12) were stored at 1-day, (12) at 1-week and (12) at 1-month time intervals, with the same criteria for Prime&Bond NT and Etch & Prime 3.0 (E&P). The specimens were stored in distilled water at room temperature and submitted to Universal Testing Machine at a crosshead speed of 0.5 mm/min. Means in MPa were analyzed statistically by Duncan′s Multiple Range Test at significant level of (p>0.05). Results: The results showed higher means of shear bond strength for Clearfil SE Bond and Prime &Bond NT were at (1-week) interval. While the higher bond strength for Etch & Prime 3.0 (E&P) were at (1-day) interval. The lower means of bond strength for Clearfil SE Bond were at (1-day). While for Prime &Bond NT and Etch & Prime 3.0 (E&P) were at (1-month) time interval. Etch & Prime 3.0 presented lower means of bond strength than Prime & Bond NT at (p<0.05). The results of this study revealed that Clearfil SE Bond showed the highest bond strength than other adhesives used in the study, which was significantly differ from Prime&Bond NT and Etch & Prime 3.0 (E&P) adhesive systems for the three time intervals used. Conclusions: In conclusion, a statistical difference between adhesive systems used in bond strength to dentin were observed when adhesives used with different aging intervals for (1-day, 1-week and 1-month). Self-etch bonding systems was showed a higher strength than total-etch adhesive systems. Etch & Prime 3.0 showed nearly equal bonding strength with the total-etch adhesives. The bonding strength of adhesive system was influenced by the type of the bonding system used with different time inter-vals.
