Effect of Different Polymerization curing times and Water Temperatures on Transverse Strength of Self-Cure Acrylic Resin Material

	Effect of Different Polymerization curing times and Water Temperatures on Transverse Strength of Self-Cure Acrylic Resin Material
journal of kerbala university
Article 1, Volume 5, Issue 3, 2009, Pages 326-332 PDF (0 K)
Abstract
The self-cured acrylic resin is inferior to heat cured acrylic resin from stand point of strength and degree of polymerization. Many attempts have been made to improve these properties. Because heat affects maturity of the chemical reaction of acrylic resin therefore its maintenance during polymerization will affect the mechanical properties of cured resin. This study was carried out to evaluate the effect of different curing time and heat application during polymerization of the self-cured acrylic resin on transverse strength compared with that polymerized in air at 23C ± 5C. Nineteen (90) Self-cured acrylic resin specimens were prepared and divided as follow:- (10) specimens polymerized in air at 23C  5C under press (bench curing) as a control group. (40) specimens polymerized in water at 20C, 40C, 60C, and 80C, under (30 psi) pressure for 15 minutes . (40) specimens polymerized in water at 20C, 40C, 60C, and 80C, under (30 psi) pressure for 30 minutes. All specimens were tested for transverse strength. Results showed that self-cured acrylic resin specimens polymerized in 15 minutes has a significant lower transverse strength than polymerized in 30 minutes. The transverse strength of the test specimens polymerized in water at 20C lower than control group, while all degree of polymerization improved transverse strength, however, in 80C highest transverse strength compared with the other temperatures control group. It can be concluded that increasing curing time and water temperature during polymerization will improve transverse strength of self-cured acrylic resin.

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