Radiopaque denture base materials technic dentures

Technic dentures were made using composite base materials containing 30,40, and 50 weight % of a silance‐treated, readiopaque, powdered glass as the reinforcing filler and poly (methyl methacrylate) as the matrix. Dentures containing no glass were included for comparison. Molar‐to‐molar dimensional changes, effects of silance treatment fo the procelain teeth and handling and finishing characteristics were determined. Dentures containing glass had less dimensional change during curing and subsequent water storage than those without glass. Thick upper dentrues exhibited the least change and thin lowers, the most. The Differences in the magnitudes of the changes would not be clinically noticeable. Silance treatment fo the procelain teeth in thick upper dentures resulted in breakage of theposterior teeth in almost all instances. posterior teeth also freactured in thick upper dentures containing 40 and 50% of the silance‐treated glass even though the teeth were not treatedwith silance. Mixing and molding properties of the composite materials, while acceptabgle, were slightly inferior to thematerial containing ono glass. Finiching characteristics were definitelyinferior in that it was more difficult and time‐consuming to attain the fial surfaces and these surfaces were not as smooth as smooth as those in dentures without glass.