Effect of Titanium Dioxide Nano Particles Incorporation on Mechanical and Physical Properties on Two Different Types of Acrylic Resin Denture Base

Abstract

The aim of this study is to clarify the effect of different concentrations of titanium dioxide nanoparticles (Nps) on the properties of two types of heat polymerized acrylic resin. The tested parameters were flexural strength, impact strength, and microhardness. The two types of acrylic resin used in this study were conventional unmodified (Implacryl, Vertex) and high impact heat polymerized acrylic resin (Vertex-Dental, Netherlands). Both types of acrylic resin were modified by using 1% and 5% TiO2 Nps powder. Specimen's dimensions were prepared according to the American Dental Association Specification No. 12. Three types of specimens were prepared: 1) flexural strength specimens 50 mm × 10 (±0.2) mm × 3 (±0.2) mm, 2) impact strength test specimens 60 mm × 6.0 mm × 4.0 mm, 3) microhardnesss specimens 25 mm × 10 mm × 3 (±0.2) mm. For each test 6 groups were prepared (each group containing 5 samples). Thirty specimens were prepared in each of the three tests, amounting to a total number of 90 specimens. Mechanical properties such as flexural strength (FS), impact strength and microhardness of the above mentioned specimens were determined using universal testing machine, Izod pendulum impact testing machine and Vickers microhardness tester, respectively. ISO Specification No. 1567 was followed in microhardness test. The data was collected and statistically analyzed. Flexural strength considerably decreased by increasing TiO2 concentration in both types of acrylic resin. Impact strength of the conventional acrylic resin modified by 1% of additives significantly increased. The microhardness is significantly increased by addition of 5% of TiO2 Nps. The Incorporation of TiO2 nanoparticles into acrylic resins can adversely affect its flexural strength. Meanwhile, the impact

Effect of addition titanium dioxide nanoparticles as acrylic resin denture base filler on cytotoxicity

“…4,5 Many techniques have been used to improve the mechanical properties of acrylic resins, including the addition of materials such as fibers or particles. 6 Many other attempts were made to increase the strength of acrylic resins by modifying the structure of PMMA by copolymerization with rubber, or reinforcement by incorporation of different forms and types of filler like metallic wire, fibers, and the use of metallic oxides. The development of nanotechnology and nano-sized materials encourages the use of nano-sized fillers to enhance denture base resins thus producing a polymer with improved mechanical and physical properties as compared to those filled with micro-sized particles.…”

“…8 Addition of 1% TiO 2 could increase impact strength while addition of 5% TiO 2 could increase microhardness in conventional acrylic resin materials. 6 The addition of TiO 2 to heatcured acrylic resin could increase impact strength, transversal strength and surface hardness. 10 Denture base material must be an inert material.…”

Evaluation of Impact Strength and Surface Hardness of Acrylic Resin Modified with Different Nano Materials: An In Vitro Study

“…[1][2][3] Despite its favorable properties such as satisfying esthetics, ease of processing, and acceptable cost, it is not considered an ideal material due to its inferior properties such as surface hardness and low impact strength. 4,5 Impact failures that happen as a result of accidental dropping of the denture lead to crack propagation which affects its clinical performance. [1][2][3][4][5][6][7][8][9][10][11][12][13] Another crucial property is surface hardness which relates to the material wear that can take place during daily denture brushing causing roughness and facilitating microbial adhesion.…”

“…4,5 Impact failures that happen as a result of accidental dropping of the denture lead to crack propagation which affects its clinical performance. [1][2][3][4][5][6][7][8][9][10][11][12][13] Another crucial property is surface hardness which relates to the material wear that can take place during daily denture brushing causing roughness and facilitating microbial adhesion. 6,7 Several techniques have been investigated to improve the properties of PMMA by incorporating suitable fillers such as fibers, metal oxides, or rubber like substances in its composition.…”

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

“…The different percentages of superinducing TiO 2 nanofiller 1% and 5% were added to the acrylic which showed that 5% of TiO 2 nanoparticles can adversely affect its flexural strength [22]. …”