The effect of different disinfectant solutions on the surface roughness of heat cure acrylic resin in comparison to visible light cure acrylic resin denture base

الملخص EN

Back ground: A new denture should be disinfected before delivery to the patient before and after adjustment procedures (1).

Also, denture should be disinfected used may have harmful effect on the plastic or metal component of the denture (2).

So the dentist must be able to recommend a denture cleanser that is effective, non deterious to denture material and safe for patient use (3, 4, 5).The aim of this study was to compare the effect of chlorehexidine and sodium hypochlorite as a disinfectant solutions on the surface roughness of different Denture base material.

Materials and methods: Sixty specimens were made from two different denture base materials.

Twenty specimen of hot cured acrylic denture base which divided into Two subgroups.

And twenty specimen of light cured acrylic denture base which divided into two subgroups.

Then each groups was immersed in 0.2 % chlorehexidine and 0.525% sodium hypochlorite for 48 hours at (37˚c) before being tested (ADAno.12, 1999) (6).

And then each specimen was measured by surface roughness test by using (profilometer device) to show the effect of each solution on the denture base roughness.

In comparison to twenty specimen immersed in distilled water as control group of hot cured acrylic and light cured acrylic.

Results: The mean values of roughness change were analyzed and showed the specimens polymerized by water bath presented a smaller differences in roughness, while the largest difference in roughness were observed in specimens polymerized by light cure system.

T-test for three disinfectant solutions were showed no significant difference among distilled water and chlorehexidine and sodium hypochlorite for both water bath and light curing method.

The t- test between water bath and light cure were showed a significant difference in surface roughness when different solution has been used.

Conclusion : the result of this study indicated that the roughness of acrylic materials was not affected by immersion in any disinfectant solution this is due to the effect of glitaraldehyde base disinfectants (alkaline, phenol buffered) on surface morphology of denture base resin (7) and also the disinfectant solution was able to reduce the pathoginicity and colorization of micro organism present on the surface of the material, so the acrylic surface remain smooth and polished (8).