Evaluation of adhesion of reline resins to the thermoplastic denture base resin for non-metal clasp denture

Abstract

This study aimed to evaluate the tensile and transverse bond strength of chairside reline resins (Tokuyama Rebase II, Mild Rebaron LC) to a thermoplastic acrylic resin (Acrytone) used for non metal clasp denture. The results were compared with those of a conventional heat polymerized acrylic resin (Paladent 20) and a thermoplastic polyamide resin (Biotone). The failure sites were examined by scanning electron microscopy to evaluate the mode of failure. As results, the bond strength of reline resins to a thermoplastic acrylic resin was similar to the value of a conventional heat polymerized acrylic resin. However, thermoplastic polyamide resin showed the lowest value. The results of this study indicated that a thermoplastic acrylic resin for non metal clasps denture allows chairside reline and repair. It was also found that the light-polymerized reline resin had better bond strength than the autopolymerizing reline resin in relining for a conventional heat polymerized acrylic resin and a thermoplastic acrylic resin.

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.…”

Nonthermal plasma on the shear bond strength of relining resin to thermoplastic denture base resin

“…3 Therefore, the bond strength of the TDBR's may be affected if used clinically and surface modification is necessary to enhance the bond strength between the thermoplastic denture base resin and relining resin. Several studies showed that the use of silica coating, 12,18 acetic acid, 9 and tribochemical silica coating combined with 4-methacryloyloxyethy trimellitate anhydride (4-META)/ methyl methacrylate (MMA) -tributylborane (TBB) 3 can improve the strength between denture bases. Although there were many attempts to improve the adhesive properties of denture base resin, limited research has been focused on thermoplastic denture base resin material.…”

“…1,9-11 Therefore, it does not provide sufflcient bond strength to autopolymerized resins for repairing fractured dentures or replacing dislodged teeth. 9,10,12 Plasma treatment has been used to modify the surface of products in the industrial world. 13 Nonthermal plasma (NTP) treatment is made of partially ionized gas with ions, electrons, and uncharged particles such as atoms, molecules, and radicals.…”

Effect of surface treatment methods on the shear bond strength of auto-polymerized resin to thermoplastic denture base polymer

“…The flexural and impact strength of polyamide polymers are higher than those of heat-cured denture base materials 12345. Nevertheless, the repair strength of auto-polymerized resins to polyamide polymers is too weak, and the repair mostly requires laboratory procedures 6789…”

“…Polyamide is a thermoplastic material produced by a condensation reaction between a diamine and a dibasic acid 714. The chemical resistance of polyamide polymers is due to their high degree of crystallinity; the penetration of monomer molecules and other resin primers into the polymers is difficult 3815. Therefore, nylon polymers do not provide sufficient bond strength to auto-polymerized resins for repairing fractured denture or replacing dislodged denture teeth 89…”