Effect of different amounts of 3-methacryloxypropyltrimethoxysilane on the flexural properties and wear resistance of alumina reinforced PMMA

Abstract

This study evaluated the different amounts of 3-methacryloxypropyltrimethoxysilane (MPS) coated alumina fi ller particles on fl exural strength and wear resistance of alumina reinforced polymethyl methacrylate (PMMA) denture base. Ten mass% of alumina fi ller silanized with 0, 0.1, 0.2, or 0.4 mass% of MPS was blended with PMMA. PMMA without alumina particles served as control. Specimens were prepared for fl exural strength and wear resistance tests (n=10). Flexural strength was determined using a 3-point bending test and volume loss was measured by in-vitro 2-body wear-testing. The results were analyzed by One-way ANOVA and Tamhane's test (α=0.05). Flexural strength ranged from 95.1-117.8 MPa, while volume loss ranged from 0.038-0.160 mm 3 . Statistical analysis indicated the 0.1 mass% MPS silanized group had signifi cantly higher fl exural strength and lower volume loss than the control group. Adding alumina fi ller silanized with 0.1 mass% MPS resulted in an improvement of the fl exural strength and wear resistance of PMMA.

The pH effect of solvent in silanization on fluoride released and mechanical properties of heat-cured acrylic resin containing fluoride-releasing filler

“…G018-090 filler was functioned as a fluoride source which had hydrophilic properties to promote water uptake and fluoride released. Addition of this filler into acrylic resin might decrease the flexural strength in contrast to the other reinforcing fillers such as silica and alumina filler 10,28) . Another reason to explain why the flexural strength of acrylic resin decreased after adding silanized G018-090 filler might attribute to an excessive filler fraction, which created weak points and impaired the flexural strength of acrylic resin 29) .…”

“…Although various additive substances increase anticariogenic effect of acrylic resin, adverse effect of fluoridated filler is a decrease in mechanical properties of the materials 5,6,9) . Silane coupling agent, a bonding agent between filler particles and resin matrix polymer, has been widely used to improve the mechanical properties of the acrylic resin 10) . The common silane coupling agent used in dental composite resins is γ-methacryloxypropyltrimet hoxysilane (γ-MPS) 11) .…”

“…The difference between these two layers is that chemisorbed silane is adsorbed on the filler surface via covalent bond, while physisorbed layer is adsorbed on the chemisorbed silane via hydrogen bond and van der Waals force 14,15) . Numerous factors affect the silanization process and silane multilayers such as type of silane 16) , amount of silane 10,17,18) and drying temperature 19) . The pH of solvent is an interesting factor which influences the quality of silanization by modifying the rate of hydrolysis and condensation reaction.…”

Effects of coating with different ceromers on the impact strength, transverse strength and elastic modulus of polymethyl methacrylate

“…Key tests to evaluate and compare the mechanical properties of denture base materials are the flexural and the impact strength tests 2,5) . Many approaches have been used to strengthen PMMA, in a bid to improve its mechanical properties and overcome the abovementioned limitations [1][2][3][4][5][6][7][8] . Although the addition of different kinds of materials has reinforced polymers, ceromers -to the best of the authors' knowledge-have not been used as a coating material in dentistry.…”

“…PMMA is widely used as a denture base material due to the desirable properties of biocompatibility in the oral environment, esthetically appealing appearance, ease of handling and processing, and low cost [2][3][4] . However, it has some disadvantages such as susceptibility to denture fractures, poor wear resistance, insufficient surface hardness, and low flexural strength 3,4) . Denture fractures are commonly caused by an accident (impact failure) or by small forces imposed during mastication (flexural failure) 5) .…”