Effect of immersion in sodium chloride solution during microwave disinfection on dimensional stability, water sorption, and water solubility of denture base acrylic resin

Abstract EN

Background : Microwave energy has been used as an alternative method for disinfection and sterilization of dental prosthesis.

This study evaluated the influence of immersion in NaCl solution, immersion in water, and in dry air during microwave disinfection on dimensional stability, water sorption, and water solubility of hot cure, cold cure, and soft acrylic resin.

Materials and methods : Three types of acrylic resin denture base materials were used in this study: hot cure, cold cure, and soft acrylic resin material.

This study was conducted to evaluate the affect of immersion in NaCl solution, immersion in water, and in dry air during microwave disinfection on dimensional stability, water sorption, and water solubility of acrylic resin denture base.

Forty-five rectangular specimens were used for testing dimensional stability, and twenty disks specimens for each type of material were made to test water sorption and water solubility.

Results : results for dimensional stability revealed that all test groups was insignificantly (p > 0.05) affected by different methods of microwave disinfection except HN and SW test groups which were significantly affect (p < 0.05).

For water sorption test, the results revealed that only cold cure acrylic resin showed a highly significant difference (p < 0.01) for CW, and CD test group.

And finally, for water solubility test show there was no significant difference (p > 0.05) for all test groups.

Conclusion : Dimensional stability could be affected by immersion in NaCl solution when used for hot cure acrylic resin, while for soft acrylic resin it could be affected when immersed in water during microwave disinfection.

Water sorption for cold cure acrylic resin significantly changed when immersed in water and when placed in dry air during microwave disinfection.