The Microtensile Strength of Bonding Resins

Background: The purpose of this study was to determine the effect of water on the tensile strength of three bonding resins (All Bond 2, Scotchbond Multi‐Purpose Adhesive, Clearfil LB Bond) and a low viscosity resin composite (Protect Liner F) after 1, 7, 28, 84 and 168 days of storage. Methods: Cylinders of bonding resin 2.4±0.2mm diameter and 9.5mm long were made and stored at 37d̀C for 24 hours. The specimens were milled into dumb‐bell shapes and stored in either air or water at 37d̀C. Five specimens of each material were stressed in tension after the specified storage times at a crosshead speed of 1mm/min in a testing jig attached to a universal testing machine. The mean tensile strengths of bonding resins were calculated and analysed statistically using one‐way analysis of variance, lower standard deviation and student t‐tests. Results: Comparison of the air and water samples at all test periods showed the tensile strengths of specimens stored in water were significantly less than those stored in air (P