Abstract
Aims: To evaluate the effect of thickness of acrylic denture base resin on the transverse strength, also to evaluate the effect of metal and fiber reinforcements on the fracture resistance of denture base resin by four mechanical tests: Transverse strength; Charpy impact strength; Tensile strength and Rockwell Indentation Hardness. Materials and methods : Heat–cured resin, and three types of reinforcing metals were used which were: The cobalt–chromium alloy mesh, stainless steel wire and nickel alloy plate. Three forms of glass fiber also were used: Random, woven, and aligned unidirectional. The effect of these reinforcing materials on the mechanical properties of heat–cured resin had been evaluated by measuring the transverse strength by the Instron testing machine, tensile strength by the Textile tensile strength Tester, the impact strength by the Charpy type impact Tester and finally the hardness by the Rockwell hardness tester. Three hundred samples were prepared in this study. Results: Revealed a statistically significant effect of thickness on the transverse strength of heat–cured resin. Results also showed that all forms of fiber and metal reinforcements had a significant effect on the transverse strength, tensile strength , impact strength and hardness of denture base resin. Conclusions: The thickness significantly increased the transverse strength of denture base resin. All forms of metal and glass fiber reinforcement significantly improved the transverse strength, impact strength and tensile strength of denture base resin. All forms of metal and fiber reinforcement acted to reduce the hardness of denture base resin
Highlights
INTRODUCTIONFracture of a denture is an important problem for patients and for dentists and dental laboratory technicians
Fracture of a denture is an important problem for patients and for dentists and dental laboratory technicians. [1]The failure of a denture base material may often involve either impact failure or fatigue failure
The results showed that thickness of acrylic resin denture base material was a significant factor in determining the strength of the denture
Summary
Fracture of a denture is an important problem for patients and for dentists and dental laboratory technicians. Fatigue failures occur after continued flexing of the base during function, which leads to crack development Failure of this type in an upper denture commonly results in rupture along the midline. Fracture strength of denture base resin is of great concern, and various approaches have been suggested to strengthen acrylic resin dentures. These are include modifying or reinforcing the resin. The addition of fibers to acrylic resin has the potential to improve the mechanical properties of the material. The aims of this study were to evaluate the effect of metal and fiber reinforcement on the mechanical properties of acrylic resin denture base material. The effect of thickness on the strength of denture base material has been studied
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