The effect of microwave disinfection on surface roughness and hardness of hot, cold acrylic resin and soft liner in different conditions

الملخص EN

Background Microwave disinfection has been suggested as a method to disinfect the denture base and soft liner however the effect of microwave heating on the surface roughness and hardness of cold cure acrylic resin, hot cure acrylic resin and soft liner have not been completely evaluated.

Materials and Methods: 90 specimens of (12x12x3) mm were made from hot cure acrylic resin and cold cure acrylic resin and soft liner and divided into two groups, the first group was tested for surface roughness by profilometer before and after the specimen were disinfected by nm'crowave-in three different groups 40% concentration nacl solution.

Distil water and dry irradiation of microwave for 10 min.

And the other group also 45 specimens made from the same three different material were tested for hardness by a vicker's hqrdness tester before and after disinfection in 40% concentration nacl solution.

Distil water and dry irradiation of microwave for 10 min.

Results: Microwave disinfection for 10 minutes in different conditions 40% concentration nacl solution.

Distil water and dry irradiation of microwave significantly increased the mean and SD values of surface roughness for hot acrylic resin, cold acrylic resin.

And highly significant increase in mean SD values of surface roughness for soft liner materials after microwave disinfection in the three different conditions while the mean and SD values of hardness for cold, hot acrylic resin and liner materials does not significantly affected after microwave disinfection in the three conditions.

Conclusion: Disinfection by microwave irradiation in 40% concentration nacl solution.

Distil water and dry irradiation of microwave for 10 minutes increase the surface roughness for all the materials been evaluated but it did not effect the hardness values of all materials been tested.