The evaluation of some flexural properties of a denture base resin reinforced with various aesthetic fibers

Abstract

This study was performed to determine whether some flexural properties of a denture base resin material could be improved through reinforcement with five types of aesthetic fibers at 3% concentration by weight and in 2, 4, and 6 mm length. Five specimens of similar dimensions were prepared for each of the test groups; base resin and the same resin with glass, rayon, polyester, nylon 6 and nylon 6,6 fibers in three different lengths. Flexural properties were evaluated by using a 3-point bending test. A visual examination was also made to determine mode of fracture of the specimens. The incorporation of different fibers in varying lengths had no significant effect on flexural strength of the resin. The specimens reinforced with nylon 6,6 fibers of 6 mm length showed the highest flexural strength. Young's modulus and maximum load suggests that such reinforcement makes resin resistant to fracture.

Flexural properties of ethyl or methyl methacrylate-UDMA blend polymers

“…There are several attempts [3][4][5][6][7][8][9][10][11][12][13][14][15][16] to increase the mechanical properties of denture base resins. One approach is to devise a reinforcement of denture base polymer with fibers, chips, or rods [12][13][14][15][16] . This technique is effective to improve the mechanical properties; however it is very difficult to incorporate accurately reinforcing materials in the desired position of the denture base resin.…”

“…Some problems should be caused by being left the shape of PMMA powder. Different molecular weight distribution of PMMA powder and PMMA matrix polymerized from MMA monomer exists in both inner-sections, even if the molecular weights of both PMMA are the same, morphology is different 16,22) . As a result, denture surfaces are roughed up suiting to PMMA powder shape by the denture brush or masticatory movement, and then more adherences of denture plaque are produced 23,24) .…”

“…Many attempts to improve the mechanical properties of polymethyl methacrylate (PMMA) have included using alternate polymers such as polycarbonate 3) , nylon 4,5) , copolymers 6,7) and urethane dimethacrylate (UDMA) 8,9) , and incorporating of butadiene-styrene rubber into PMMA matrix 10,11) . As another attempt, various fiber or chip materials [12][13][14][15][16] such as carbon, aramid and glass have been added into PMMA resin for reinforcing materials, and metal wires and meshes have ordinary been used for reinforcing materials to prevent the midline fracture of denture.…”

The assessment of impact properties of a denture base polymer reinforced with various fibbers

“…However, there is on-going search for alternative reinforcing materials with better mechanical properties than the commonly used glass fiber (8).…”

“…In the studies by Dogan et al (8)used five types of aesthetic fibers as an denture base resin reinforcer at 2, 4, and 6 mm length and at 3% concentration by weight. Dogan reported that the incorporation of different fibers in varying lengths had no significant effect on flexural strength of the resin.…”