Abstract
Statement of problem: Many processes have been applied to improve the fracture resistance of acrylic resin dentures by reinforcing them. The maximum goal of any denture repair is to restore the main strength of the denture and to avoid further fracture. Purpose: This study investigated the ability of self-curing acrylic resin to be strength and deflection of repaired acrylic resin joints reinforced with various reinforcement materials to resist fracture. Material and methods: Transverse strength of polymethyl methacrylate acrylic resin reinforced with glass fiber mesh, metal mesh, and metal wire was evaluated with a 3-point load test on 40 intact specimens (n = 10 for control group) (n = 10 per each reinforcement material group). Fractured joint margins were rounded, a 4-mm gap was placed between them, and then they were repaired with autopolymerizing acrylic resin and retested. Results: Transverse strength for the polymethyl methacrylate acrylic resin samples has showed fracture at the side of sample rather than in the middle area of reinforcement materials and some other samples showed bending statue rather than fracture. Conclusion: Reinforcement with glass fiber mesh, metal mesh, and metal wire produced transverse strength in the side area of resin denture base material rather than in the middle of reinforcement area with bending samples rather than fracture response.
Highlights
Since the introduction of polymethyl methacrylate (PMMA) in dentistry in 1937, it has become the material of choice as a denture base material
Material and methods: Transverse strength of polymethyl methacrylate acrylic resin reinforced with glass fiber mesh, metal mesh, and metal wire was evaluated with a 3-point load test on 40 intact specimens (n = 10 for control group) (n = 10 per each reinforcement material group)
The aim of this study was to evaluate the fracture resistance for PMMA as denture base material that reinforced with metal mesh, glass mesh and metal wire materials that were embedded in self-cure acrylic resin to compare between them in vitro
Summary
Since the introduction of polymethyl methacrylate (PMMA) in dentistry in 1937, it has become the material of choice as a denture base material. PMMA has some clinically desirable properties such as good strength, durability, dimensional stability, chemical stability, biocompatibility, cost effectiveness, and an acceptable taste [1] [2] [3]. Most denture bases are made of acrylic polymers and have gained wide patient acceptance. Dentures are known to undergo failures such as polymerization shrinkage, weak flexural, lower impact strength, low fatigue resistance, midline fractures of complete dentures, de-bonding of teeth, and other types of failures in complete or partial dentures [4] [5]. In a survey on the causes of repairs involving complete and partial dentures, it was reported that 29% of all repairs to dentures were associated with midline fractures of complete dentures. There is a clear need to understand why such fractures occur, and to find ways to reinforce the dentures to prevent such failures [8] [9] [10]
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