Transverse and Bond Strength of Restorative Resins

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Abstract
One silicate, one acrylic resin, and five manually and two mechanically mixed composite resins were studied. The strength was tested by three point loading on rectangular specimens (2 × 2 × 12 mm) 24 hours after storage in water. The lateral thirds of the bond strength specimens consisted of old and the central third of newly added material. The transverse strength of the strongest composite resin was five times higher than that of the silicate cement, two times higher than that of the acrylic resin and of the weakest composite, but one third of the average strength of amalgam. There were no differences in strength between manual and mechanical mixing of the silicate cement or between using flow and brush technique for the acrylic resin. Using the recommended ratio of the base to catalyst paste of a composite resulted in the highest strength value compared with the strength when the amount of either base or catalyst paste was doubled. Varying the time of the ultrahigh-speed mixer for one composite did not reveal significant differences in strength. Mixing in the high-speed amalgamator resulted in the same strength if the mixing time was increased by fifty per cent as mixing in the ultrahigh-speed mixer. The strength of the repaired acrylic resin specimens was a little less than that of unrepaired specimens. The strength of repaired composites was half or less, than that of unrepaired materials.

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