Abstract
Aims: The aims of this study are to determine the effect of different polymerization treatment on the transverse strength and residual monomer of auto polymerized acrylic denture base. Materials and Methods: Sixteen samples of heat cured acrylic resin were prepared as a control samples. Eighty samples of auto polymerized acrylic resin were prepared with different polymerization treatments to be tested for transverse strength and residual monomer concentration. These polymerization treatments were carried out by: (1) Open air polymerization treatment, (2) Under hydraulic pressure, (3) Under clamp pressure, (4) Water bath post polymerization. (5) Microwave post polymerization. One half of specimens were subjected to transverse strength test and another one subjected to residual monomer test. Data were analyzed using analysis of variance and Duncan's Multiple Range Test. Results: The result of this study showed that the microwave post polymerization treatment had significantly higher transverse strength, and also showed that the residual monomer significantly lower with microwave and water bath post polymerization treatment. Conclusions: The fracture resistance was improved after post polymerization treatment for auto polymerized acrylic denture base with microwave, and the adverse effect of monomer was decreased by water bath and microwave post polymerization treatment.
Highlights
The auto polymerized acrylic resin has multiple uses in dentistry such as denture base, record base, orthodontics appliances, denture repair and other
The result of this study showed that the microwave post polymerization treatment had significantly higher transverse strength, and showed that the residual monomer significantly lower with microwave and water bath post polymerization treatment
The reason for the higher residual monomer content in the auto polymerizing acrylic resins is due to the low degree of conversion achieved by the use of a chemical activator, as opposed to that generated by heat activation[4]
Summary
The auto polymerized acrylic resin has multiple uses in dentistry such as denture base, record base, orthodontics appliances, denture repair and other. The auto polymerized acrylic denture base materials have a wide range of toxic effect, and lower mechanical strength (less than 80%) when compared with heat polymerized acrylic denture base resin[1,2] This occurs, because there is a less residual monomer in heat–polymerized acrylic resins than in auto polymerizing acrylic resins[3]. Placing of auto polymerized acrylic resin in hot water during polymerization (60–80°C) Water condition may produce less residual monomer in an auto polymerizing acrylic resin, and transverse strength of the resin two time greater when compared with polymerization at 23°C (open to air). This lead to obtain greater increased mechanical properties www.rafidaindentj.net
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