Abstract
Statement of the Problem. Acrylic resin-based dentures can fracture; thus they can benefit from reinforcement.Purpose. To evaluate the effect of a novel reinforcement structure made of nylon fibers and silica particles on the flexural strength of acrylic resin after relining and aging.Materials and Methods. Bar-shaped specimens were fabricated and divided into the following experimental groups (n=20): control (acrylic resin without reinforcement); acrylic resin nylon fiber-reinforced; acrylic nylon and silica fiber-reinforced; acrylic nylon fiber-reinforced-relined; acrylic nylon and silica fiber-reinforced-relined. Half of the specimens from each group were aged by thermomechanical cycling (10000 cycles between 5°C and 55°C) before flexural strength testing to failure using a universal testing machine. Data (MPa) were statistically analyzed using analysis of variance and Tukey tests (α=5%).Results. Adding nylon fibers or silica-containing nylon fibers significantly increased the flexural strength of all the groups tested. Within the similar groups processed in the same manner, the relining procedure reduced the flexural strength of the specimens, whereas aging process had no effect on the strength values.Conclusion. Incorporating a silica-containing nylon fiber mesh into acrylic resin yielded the greatest flexural strength for the evaluated structures.
Highlights
Despite the technological advances and improvements made in oral health, a large percentage of the population are edentulous
The authors have proposed to test a new method of acrylic resin reinforcement; the aim of this study was to evaluate the effect of nylon fiber and silica mesh on the flexural strength of acrylic resin after relining and aging, testing the following hypotheses: (1) Nylon fiber added or not by silica improves the flexural strength of acrylic resin
Groups aR: aged relined acrylic resin R: relined acrylic resin aRN: aged relined nylon fiber-reinforced acrylic resin C: acrylic resin aC: aged acrylic resin RN: relined nylon fiber-reinforced acrylic resin aN: aged nylon fiber-reinforced acrylic resin aRSN: aged relined silica-containing nylon fiber-reinforced acrylic resin RSN: relined silica-containing nylon fiber-reinforced acrylic resin N: nylon fiber-reinforced acrylic resin aSN: aged silica-containing nylon fiber-reinforced acrylic resin SN: silica-containing nylon fiber-reinforced acrylic resin ∗Values followed by different letters are statistically different (p < 0.05)
Summary
Despite the technological advances and improvements made in oral health, a large percentage of the population are edentulous. In such cases, the use of complete dentures remains a viable treatment [1]. Complete dentures are fabricated using acrylic resin that provides dimensional stability, strength, and hardness, resulting in comfortable, esthetically pleasing, and highly functional dentures [2]. Because of a considerable incidence of denture fracture, the need for repair has promoted the development of new materials and techniques improving fracture resistance and flexural strength of dentures. Some attempts have been made to incorporate metal structures and polymers (polyethylene and nylon) or glass fibers into the acrylic resin [6,7,8]
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