TiO2-Nanofillers Effects on Some Properties of Highly- Impact Resin Using Different Processing Techniques

Abstract

Background:The criteria of conventional curing of polymethyl methacrylate do not match the standard properties of the denture base materials.Objectives:This research was conducted to investigate the addition of TiO2 nano practical on impact strength, thermal conductivity and color stability of acrylic resin cured by microwave in comparison to the conventional cured of heat-polymerized acrylic resin.Materials and Methods:120 specimens made of high impact acrylic resin were divided into two main groups according to the type of curing (water bath, microwave), then each group was subdivided into two groups according to the addition of 3% TiO2 nano-fillers and control group (without the addition of TiO2 0%). Each group was subdivided according to the type of test into 3 groups with 10 specimens for each group. Data were statistically analyzed using Student t-test to detect the significant differences between tested and control groups at significance level (P<0.05).Results:According to curing type methods, the results showed that there was a significant decrease in impact strength of microwaved cured resin, but there was no significant difference in the thermal conductivity and color stability of resin. In addition, by using nanofiller, there was a significant increase in the impact strength and color stability with the addition of 3% TiO2 nanofillers, but no significant difference was found in the thermal conductivity of the acrylic resin.Conclusion:The microwave curing of acrylic resin had no change in the color stability and thermal conductivity in comparison to the water bath, but the impact strength was decreased. The addition of 3% TiO2 improved the impact and the color stability, but the thermal conductivity did not change.

Effect of Zirconia Nanoparticles Incorporation on Some Properties of One High - Impact Heat cured PMMA Resin

“…The microwave-cured specimens were deflasked after overnight bench cooling. 2,14 Excess resin material was carefully trimmed with a tungsten carbide bur (HM251FX-040-HP; Meisinger, Centennial, CO, USA). Specimens were finished and polished according to manufacturer's instructions under running water to minimize heat generation and avoid distortion of specimens.…”

“…As they have many advantages such as, simple laboratory procedures, easy to repair, good fit, sufficient stability in oral condition, accurate reproduction of tissue details, lightness in weight, low cost, lack of toxicity, and patient satisfaction in relation to color matching and good aesthetic. [1][2][3] Unfortunately, these resins have inadequate mechanical properties which may lead to premature fracture of the dentures during service. After few years of PMMA denture use, it may deteriorate under normal masticatory forces due to fatigue, continuous flexing, sudden fall, or uneven stresses associated with malocclusion or poor fit.…”

Behavior of PMMA Denture Base Materials Containing Titanium Dioxide Nanoparticles: A Literature Review

“…Its photocatalytic ability promoted it to be known as an antimicrobial agent encouraging its addition to biomaterials [11, 12, 20, 23, 25]. TiO 2 NP have been found effective against a wide range of microorganisms including gram-positive and gram-negative bacteria, fungi, and viruses [11, 23, 25]. The antimicrobial effect could be attributed to the surface properties and structure of the nanoparticles, including; nanocrystalline TiO 2 , hydrophilic surface effect, infrared reflectivity, and noncontact antimicrobial activity.…”

“…The monomer containing NP was sonicated for 60 min before mixing with PMMA powder [32]. Others were sonicated using a probe at 120 W and 60 KHz for 3 min to prevent nanoparticles agglomeration and insure homogeneity of the mixture [18, 25].…”

Studying the effect of adding Titanium Dioxide (TiO2) nanoparticles on the compressive strength of chemical and heat-activated acrylic denture base resins

“…The nature of the incorporated nanoparticles, their size, and morphology play an important role in determining the properties of new materials [5]. Various types of nanomaterials such as zirconium oxide [3,8], carbon nanotube [9], aluminium dioxide [10], silver [11], zinc oxide [12] and widely used titanium dioxide [13][14][15][16] were used to increase the mechanical properties of Acrylic Denture Base Resin (ADBR). Titanium dioxide (TiO2) acts as a coloring agent and it can bring additional benefits to ADBR such as antimicrobial properties [17].…”