IADR Abstract Archives
Consistency of Universal Adhesives’ Bond Strength to Variable Dentin Conditions
Objectives: To evaluate if universal adhesives provide consistent bond strength values when applied on the different dentin moisture levels in comparison to three-step etch-and-rinse adhesives.
Methods: Three hundred extracted sound teeth were sectioned mesio-distally to expose dentin[CGG1] , embedded in resin, then gradually finished with a 600 grit size sandpaper, followed by ultrasonic cleaning in distilled water for 10 minutes. Five dentists with at least ten years of experience in general dentistry, and five pre-doctoral dental students without any dental experience applied universal (Adhese Universal, Ivoclar Vivadent) and etch-and-rinse (OptiBond FL, Kerr Sybron) adhesives on wet, moist and dry dentin surfaces (n=5/group). Subsequently, composite restorations (Tetric EvoCeram Bulk Fill, Ivoclar Vivadent) were applied using an Ultradent bonding jig by the same operator. Shear bond strength (SBS) test was conducted using a universal testing machine (Instron, Canton, MA, USA). Descriptive statistics and pairwise comparisons using a Tukey HSD adjustment were calculated.
Results: A significant difference in SBS was found between universal and etch-and-rinse adhesives (p<0.001). Overall, universal adhesive possessed 7.38+/-0.89 greater dentin bond strength (MPa) than the etch-and-rinse adhesive. While there was no difference between the dentin surface conditions for the universal adhesive, a significant difference was found with etch-and-rinse adhesive between moist and wet (moist 2.67MPa+/-0.89 greater than wet) (p=0.002), and dry and wet conditions (dry 3.79MPa+/-0.89 greater than wet) (p<0.001). There was no difference between moist and dry conditions with etch-and-rinse adhesive (Figure).
Conclusions: The tested universal adhesive showed better consistency as a function of bond strength than the three-step etch-and-rinse adhesive on various dentin conditions. Dentin moisture level did not influence dentin SBS values of universal adhesive.
Methods: Three hundred extracted sound teeth were sectioned mesio-distally to expose dentin[CGG1] , embedded in resin, then gradually finished with a 600 grit size sandpaper, followed by ultrasonic cleaning in distilled water for 10 minutes. Five dentists with at least ten years of experience in general dentistry, and five pre-doctoral dental students without any dental experience applied universal (Adhese Universal, Ivoclar Vivadent) and etch-and-rinse (OptiBond FL, Kerr Sybron) adhesives on wet, moist and dry dentin surfaces (n=5/group). Subsequently, composite restorations (Tetric EvoCeram Bulk Fill, Ivoclar Vivadent) were applied using an Ultradent bonding jig by the same operator. Shear bond strength (SBS) test was conducted using a universal testing machine (Instron, Canton, MA, USA). Descriptive statistics and pairwise comparisons using a Tukey HSD adjustment were calculated.
Results: A significant difference in SBS was found between universal and etch-and-rinse adhesives (p<0.001). Overall, universal adhesive possessed 7.38+/-0.89 greater dentin bond strength (MPa) than the etch-and-rinse adhesive. While there was no difference between the dentin surface conditions for the universal adhesive, a significant difference was found with etch-and-rinse adhesive between moist and wet (moist 2.67MPa+/-0.89 greater than wet) (p=0.002), and dry and wet conditions (dry 3.79MPa+/-0.89 greater than wet) (p<0.001). There was no difference between moist and dry conditions with etch-and-rinse adhesive (Figure).
Conclusions: The tested universal adhesive showed better consistency as a function of bond strength than the three-step etch-and-rinse adhesive on various dentin conditions. Dentin moisture level did not influence dentin SBS values of universal adhesive.
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