IADR Abstract Archives
Universal Adhesives: Initial Shear Bond Strength
Objectives: Universal dental adhesives have gained popularity amongst practitioners due to their ease of use and their utility to bond most materials. This project measured the shear bond strength of four popular universal adhesives when bonding resin composite to human dentin, and compare them to a traditional 3-step adhesive system.
Methods: Extracted human molars were collected and stored in Chloramine-T. The teeth were sectioned mid-coronally, and the apical portion embedded in epoxy leaving the dentin surface exposed. Samples were polished to 600 grit paper to produce a flat bonding surface. One of four universal adhesives was applied to the surface following manufacturer’s instructions. The adhesives were: Scotchbond Universal (3M, Minneapolis, MN) All-Bond Universal (Bisco, Schaumburg, IL); Clearfil Universal (Kuraray, Houston, TX); Adhese Universal (Ivoclar Vivadent, Amherst, NY). Scotchbond Multipurpose Etch-and-Prime adhesive (3M) was used as a control adhesive. An Ultradent mounting jig (South Jordan, UT) was used to place a cylinder (2.38mm x 2mm high) of composite onto the exposed dentin surface. Samples were stored for 24 hours, after which a shear bond strength test was performed on each sample using an Electropuls E3000 (Instron, Norwood, MA) with a crosshead speed of 0.5mm/min.
Results: The results are presented in figure 1. There were no signficant differences amongst any of the universal adhesive groups, or between any of the universal adhesive groups and the Scotchbond Multipurpose Etch and Prime 3-step adhesive.
Conclusions: All of these universal adhesives had shear bond strengths statistically equivalent to that of Scotchbond Multipurpose Etch-and-Prime adhesive, which has been considered the gold standard for composite bonding for many years. As such, compared to the etch and rinse adhesives, all of these adhesives would provide clinically acceptable bond strengths, are less technique sensitive, have a faster restoration time, and result in increased clinical efficiency.
Methods: Extracted human molars were collected and stored in Chloramine-T. The teeth were sectioned mid-coronally, and the apical portion embedded in epoxy leaving the dentin surface exposed. Samples were polished to 600 grit paper to produce a flat bonding surface. One of four universal adhesives was applied to the surface following manufacturer’s instructions. The adhesives were: Scotchbond Universal (3M, Minneapolis, MN) All-Bond Universal (Bisco, Schaumburg, IL); Clearfil Universal (Kuraray, Houston, TX); Adhese Universal (Ivoclar Vivadent, Amherst, NY). Scotchbond Multipurpose Etch-and-Prime adhesive (3M) was used as a control adhesive. An Ultradent mounting jig (South Jordan, UT) was used to place a cylinder (2.38mm x 2mm high) of composite onto the exposed dentin surface. Samples were stored for 24 hours, after which a shear bond strength test was performed on each sample using an Electropuls E3000 (Instron, Norwood, MA) with a crosshead speed of 0.5mm/min.
Results: The results are presented in figure 1. There were no signficant differences amongst any of the universal adhesive groups, or between any of the universal adhesive groups and the Scotchbond Multipurpose Etch and Prime 3-step adhesive.
Conclusions: All of these universal adhesives had shear bond strengths statistically equivalent to that of Scotchbond Multipurpose Etch-and-Prime adhesive, which has been considered the gold standard for composite bonding for many years. As such, compared to the etch and rinse adhesives, all of these adhesives would provide clinically acceptable bond strengths, are less technique sensitive, have a faster restoration time, and result in increased clinical efficiency.
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