Brief Background: Both three-step etch-and-rinse adhesives and universal adhesives have proven their effectiveness to produce successful bond to dentin. However, there are no studies comparing adhesives’ bond strength when applied by multiple operators, and to variable dentin conditions. Objectives: To evaluate and compare the bond strength of a universal adhesive when applied by multiple operators, and to variable dentin conditions, in comparison to three- step etch-and-rinse adhesive. Methods: Three hundred extracted human teeth were embedded in resin. Five dentists with at least ten years of experience in general dentistry and five pre-dental students applied a universal adhesive (Adhese Universal, Ivoclar Vivadent, Amherst, NY) and an etch-and-rinse adhesive (OptiBond FL, Kerr, Orange, CA) on wet, moist and dry dentin surfaces (n=5/group). Subsequently, composite restorations (Tetric EvoCeram Bulk Fill, Ivoclar Vivadent) were applied using Ultradent shear bond testing jig. After a technique demonstration, the same operators repeated the same bonding procedures. Shear bond strength test was conducted using a universal testing machine (Instron, Canton, MA, USA). Failure mode was evaluated by using scanning electron microscopy (SEM). Results: After calculating the descriptive statistics and pairwise comparisons using a Tukey HSD, a significant difference in dentin bond strength by adhesive was found, p
| Date of Award | Jan 1 2019 |
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| Original language | English |
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| Supervisor | Sibel Antonson (Supervisor) |
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