Effect of different palatal vault shapes and woven glass fiber reinforcement on dimensional stability of high impact acrylic denture base [part II]

Abstract

Background: Change in palatal vault shape and Reinforcement of high impact acrylic denture base resin may inturn affect the dimensional accuracy of acrylic resin and affecting the fitness of the denture. The aim of study is toevaluate the effect of fiber reinforcement for high-impact acrylic resin denture base with different palatal vaultshapes on linear dimensional change and effect of palatal vault shapes on linear dimensional changes of nonreinforcedand fiber reinforced high impact denture base acrylic resinMaterial and method: Three different palatal vault shapes were prepared on standard casts using CNC (computernumerical control) machine. 60 samples of heat polymerized high impact acrylic resin maxillary denture base werefabricated onto each definitive cast according to manufacturer instruction. Samples divided into three mainexperimental groups represented the three different palatal vault shapes (20 samples for each main group); 1strounded 2nd U-shaped and the 3rd groups V-shaped. Each main group divided into two subgroups (10 samples foreach subgroup) representing non fiber reinforced high impact acrylic group as a control and the fiber reinforcedhigh impact acrylic. The measurements of linear dimensional changes of denture bases done at two stages, 1st 24hour after polymerization and 2nd measurement done after one month storage in distilled water at roomtemperature.Results and conclusion: Linear dimensional changes of high impact acrylic denture base not affected by glass fiberreinforcement p-value in all reference lines ≥ 0.05, while topographical change in maxillary vault shapes effects onthe linear dimensional changes in woven glass fiber reinforced high impact acrylic denture base p-value < 0.05