Physical and mechanical properties of PMMA resins containing γ‐methacryloxypropyltrimethoxysilane

Abstract

The polymethylmethacrylate (PMMA) resins containing c-methacryloxypropyltrimethoxysilane (c-MPS) of 0, 2, 4, 6, 10, 15, 20 and 30 mo1%, added to methylmethacrylate, were prepared using a monomer-polymer technique and stored in air or water at 37 % 0AE5°C for 28 days. The flexural strength and flexural modulus of the PMMA resins containing c-MPS of 20 and 30 mo1% were significantly smaller than those containing 2-6 mo1% and the same statements were true for the adhesive strength to porcelain tooth. However, its value of adhesive strength to Co-Cr alloy was remarkably less than to porcelain tooth. By contrast, there was no significant difference among the Knoop hardness of the PMMA resins examined. On the other hand, the thermal expansion had an increasing tendency with an increase of a c-MPS content. The dynamic shear modulus within a temperature measured (20-140°C) decreased s1ightly as the c-MPS content of the PMMA resins increased, and the peak temperature of mechanical loss tangent also tended to decrease. These results indicated that the PMMA resin containing c-MPS of 6 mol% was the best composition from the standpoint of an excellent adhesive strength against porcelain, although its water absorption was 1AE9 times that of PMMA.

Antifungal Effect of Acrylic Resin Containing Apatite-coated TiO2 Photocatalyst

“…The first one pertained to the degree of conversion of acrylic resin. Some studies reported that the Fs value decreased with increase in the content of other compounds added to acrylic resin 30,39) . In the context of the present study, the degree of conversion of acrylic resin might be adversely affected because of the addition of other material namely TiO2 or Ap-TiO2.…”

“…To solve this problem, adhesive monomers such as 4-methacryloxyethyl trimellitate anhydride (4-META) and -methacryloxypropyltrimethoxysilane ( -MPS) have been used to improve bonding between metal and resin [39][40][41] . In the context of the present study, the physical and mechanical properties of acrylic resin containing TiO2 or Ap-TiO2 might be impaired by adding an adhesive monomer.…”

Self-cleaning Ability of a Photocatalyst-containing Denture Base Material

“…Therefore, the amount of photocatalyst that was contained in the resin was the dominant factor in the reduction of mechanical strength. Kanie et al reported that when γ-methacryloxypropyltrimethoxysilane was added to PMMA resins to increase the adhesive strength to porcelain tooth, the flexural strength of the PMMA resins decreased 22) . They reported that this was due to inhibited polymerization.…”

Antifungal, optical, and mechanical properties of polymethylmethacrylate material incorporated with silanized zinc oxide nanoparticles

“…This reaction may explain the finding that increased silane coupling agent in PMMA resulted in more water absorption. 31 Moreover, the dissociation energy of the Si-O bond in the silane coupling agent is higher than that of Zn-O. 32 Therefore, unbound Zn ions that have an antifungal effect can easily dissociate due to water absorbing into the material.…”