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.
Highlights
Many investigators used extracted human teeth to evaluate the adhesive strength characteristics of dental adhesive and restorative materials
As shown in Table 2, Clearfil SE Bond were statistically different from Prime & Bond NT and Etch & Prime 3.0 at all times (p>0.05)
The lowest shear bond strengths were obtained for Etch & Prime 3.0 and they were similar to those obtained with Prime & Bond NT after 1-month (2.31 and 2.74 Mpa) respectively
Summary
Many investigators used extracted human teeth to evaluate the adhesive strength characteristics of dental adhesive and restorative materials. The widespread use of the teeth in vitro bond strength studies simulates in vivo situations. Because of recent progress in conservative dental treatment, there is great difficulty in finding sound, non-carious human teeth for in vitro bonding studies. The use of adhesive systems on dentin substrate is more effective. ISO/TC106/SC 1 N236, Resolution 61 – CD TR 11405, Trieste, October, 1991] for dentin bond tests which suggests a standard specimen storage period for which durability is analyzed. This standard demonstrates that specimens may be stored in distilled water at 37°C for few days to months.
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