Fracture Resistance and Patterns of Fracture in Maxillary Complete Dentures Reinforced with Glass and Aramid Fiber Mesh under Dynamic Fatigue Loading - An In Vitro Study
Keywords:
Acrylic resin, Polymethylmethacrylate, Fracture resistance, Glass fiber mesh, Aramid fiber mesh, Dynamic fatigue loadingAbstract
Background: Polymethyl methacrylate fails to meet mechanical requirements, particularly, fracture resistance which has led to reduced clinical longevity of the prosthesis. Aim: The aim of this study was to evaluate and compare the fracture resistance and patterns of fracture in unreinforced, glass & aramid fiber mesh reinforced maxillary complete dentures under dynamic fatigue loading. Methods: Forty-eight dentures were divided into three groups of 16 each. Unreinforced, Glass and Aramid fiber mesh-reinforced maxillary dentures were fabricated using heat polymerized polymethylmethacrylate. They were stored in artificial saliva for six months. Fatigue testing was performed using a chewing simulator with 100 N load for 2,40,000 cycles (corresponding to one year). Fracture resistance was evaluated using a Universal testing machine. Patterns of fracture were categorized as, complete, incomplete fracture (anterior & posterior fracture, anterior fracture, posterior fracture) and central deformation only (loaded area). Statistical analysis was conducted using descriptive statistics, ANOVA and Post-hoc Tukey's test. Results: Aramid fibre mesh reinforced maxillary denture demonstrated the highest mean fracture resistance of 1561.82±198.49 N, followed by glass fibre mesh reinforced and unreinforced maxillary dentures with 1436.75±231.39 N & 1046.76±94.61 N, respectively. Unreinforced group showed complete fracture occurring in the midline, while the reinforced maxillary complete denture showed incomplete fracture. Conclusion: Glass and aramid fiber mesh reinforcement significantly increased the fracture resistance of dentures. Although not statistically significant, aramid-reinforced dentures exhibited the highest fracture resistance than glass fiber. All intact fractures were noted with reinforced dentures, facilitating easy repair. These findings may improve the longevity and durability of dentures.
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