The effect of different types of separating medium on the hardness of different types of heat-cure acrylic resin materials

الملخص EN

In the present study evaluation of the effect of different types of separating medium on the hardness of hot-cure acrylic resin material cured by water path conventional method and microwave curing method.

Forty specimens of hot-cure acrylic resin were fabricated in order to provide an standardized dimensions of tested specimens (65mm x 50mm x 2.5 ± 0.03mm) length, width and depth respectively these specimens were invested by either cold mold seal or glycerin separating medium.

(40) specimens were used in this study, divided into four main groups according to the type of separating medium and curing technique used (ten specimen for each group) ; were as follows : Group A : Specimens lining with cold mold seal separating medium (C-M-S) (control group) cured by water bath device Group B : Specimens lining with glycerin separating medium (G) cured by water bath device Group C : Specimen lining with cold mold seal separating medium (C-M-S) cured by microwave device Group D : Specimens lining with glycerin separating medium (G) cured by microwave device-The result of this study indicated a significant difference between groups (p < 0.05) in ANOVA test and heat-cure acrylic cured by water bath that lining with glycerin have a high mean value in comparison to another tested groups and heat-cure acrylic cured by microwave that lining with glycerin have a lower mean value in comparison to another tested groups.

From this study we can concluded that glycerin is safely separating medium that can be used in dental laboratory because it is less cost and gives good mechanical properties when used with acrylic denture base materials.

Also we can conclude that the type of packing or curing method affects the hardness of heat-cure acrylic resin.