Effect of conventional polishing procedure in water sorption of cold and heat cured acrylic denture base material

Abstract EN

Acrylic resin is almost universally for partial or complete denture base construction due to its favorable properties.

Unfortunately some disadvantages such as water sorption have been reported which causes dimensional changes that may subject the acrylic denture base to internal stresses, so the water sorption is a physical property of importance.

Forty square shaped specimens (twenty specimens for heat and cold cured acrylic material) were prepared.

Ten specimens from heat cured acrylic (HP) and cold cured acrylic (CP) material were polished, and ten specimens from heat cured acrylic (Hx) and cold cured acrylic (Cx) were not polished as control group.

At room temperature, all specimens were weighed; this weight value was considered the initial weight of the specimen (W0).

All specimens were kept in distilled water bath for 24 hours, and then specimens were weighed(W1)then the specimens were kept out of water bath for 24 hours to dry to (W0), and all samples return back to water bath for 24 hours to weigh again (W2).

This manner was repeated till (W4).There is a significant difference (p=0.018) between (CP) and (Cx) and a significant difference (p=0.047) between (HP) and (Hx) and no significant difference between cold and heat cured acrylic before (p=0.699) and after polishing (p=0.52) at (p ≤0.05).