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The microtensile strength of bonding resins
1School of Dental Science, University of Melbourne.
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 +/- 0.2 mm diameter and 9.5 mm long were made and stored at 37 degrees C for 24 hours. The specimens were milled into dumb-bell shapes and stored in either air or water at 37 degrees C. Five specimens of each material were stressed in tension after the specified storage times at a crosshead speed of 1 mm/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 < 0.001).
Conclusion:
The effect of water on the tensile strength of bonding resins indicated a slight decrease in strength of each material over the 168 day test period, whereas the air samples showed little change over the test period.