Mechanical Properties of Polyamide Versus Different PMMA Denture Base Materials

Abstract

While polyamide denture material produced good fracture resistance, its modulus is not yet sufficiently high to be equal to standard PMMA materials. Clinical Implications. Polyamide has some attractive advantages, but will require modification to produce consistently better properties than current PMMA materials.

Effect of fiber content on flexural properties of glass fiber-reinforced polyamide-6 prepared by injection molding

“…Several types of polyamides are most commonly used, having the longest history among the thermoplastic resins used for NMCDs 2) . Several studies have evaluated the properties of polyamide denture base materials, such as their flexural properties 1,5,6) , water sorption 1,7,8) , color stability 1,4,7) , bond strength to acrylic resins 9,10) , dimensional accuracy 11) , and surface roughness 4,12) . According to the results of these studies, polyamides were thought to be an alternative to the conventional acrylic resins due to their esthetic and functional characteristics and physical properties such as thermo-injectability, high impact strength and flexibility.…”

Effect of polymerization cycles on flexural strengths and microhardness of different denture base materials

“…Therefore, the Vickers hardness test is a simple, effective way to assess the degree of conversion of monomer to polymer during polymerization [13][14][15] . The polymerization reaction of acrylic resins has been initiated by heat, light, auto, microwave, or injection molding [16][17][18] . Heat polymerization is the most widely used polymerization method of acrylic resin denture base materials and is usually carried out in a heated water bath 19) .…”

Effect of repair resin type and surface treatment on the repair strength of polyamide denture base resin

“…Denture base materials are subjected to compressive, tensile, and shear stresses during function, and fractures in the denture base may develop through repeated masticatory forces or high impact forces that may occur as a result of dropping the prosthesis 3,9) . There have been different methods used to improve the mechanical properties of PMMA, such as modifying the PMMA chemical structure and reinforcing the PMMA with various fibers, metal wires, and frameworks 6,[10][11][12] . However, cast metal frameworks have the disadvantages such as corrosion of the metal, allergic reactions, and the unappealing appearance of metal clasps 10) .…”

“…There have been different methods used to improve the mechanical properties of PMMA, such as modifying the PMMA chemical structure and reinforcing the PMMA with various fibers, metal wires, and frameworks 6,[10][11][12] . However, cast metal frameworks have the disadvantages such as corrosion of the metal, allergic reactions, and the unappealing appearance of metal clasps 10) . Another method for improving the physical properties of the prosthesis is injection molding 13) and the SR-Ivocap system (Ivoclar Vivadent AG, Schaan, Liechtenstein), which is an injectable PMMA 14) .…”

“…Additional advantages of polyamide resins include superior esthetics, reduced allergic reactions, and decreased stress on abutment teeth 17,18) . However, the repair of a polyamide prosthesis is difficult and expensive, and often, the creation of a new prosthesis is more desirable than repairing a fractured polyamide prosthesis 10) . There are a limited number of studies in the literature evaluating the repair of polyamide denture base materials.…”