Experimental Investigation for Some Properties of PMMA Denture Base Strengthened by Different Nanoadditives

Abstract

In dental and medical applications, poly-methyl methacrylate (PMMA) has been widely accepted due to the excellent biocompatibility and easy fabrication. Yet, some of the physical and mechanical characteristics of this compound are considered inferior. Seven groups of PMMA nano-composite samples were reported to be fabricated at laboratory temperature . These samples could be used in manufacturing the complete or partial maxillary denture base. The aim of this research is to prepare nano-composite materials which consist of PMMA as a matrix material and two different types of powder (prepared nanoparticles of SnO2 and natural egg shell powder (ESP)) as strengthening materials. The selected additives were used in many cases as pure or hybrid composites, specifically with weight percentage ratios of 1 and 2 wt%. Several analytical tests, namely AFM, FTIR, XRD and SEM, were used on the prepared nanoparticles. In addition, several tests were applied to assess the mechanical behavior before and after the reinforcement, including thermal conductivity, Vickers micro-Hardness, and water absorption. The results showed that the maximum amount of energy absorption in the composites was 1% at different types of additives, while a significant increase in thermal conductivity was recorded as the SnO2NPs percentage was increased. For surface micro-hardness, an obvious trend of increase was observed with the increase in additive percentage. The highest measured values of micro-hardness (19.59VHS and 13.30VHS) were recorded for the pure composites of 2% ESP and 2% SnO2, respectively. The results of water absorption test showed that higher percentages of ESP and SnO2, separately, within the pure composite resulted in higher water absorption capacity and an increased value of diffusion coefficient (D).

Mechanical Features of PMMA Microfluidic Chips Implemented by Carbon Dioxide Laser

“…The large peak between 3100 and 2900 cm -1 is caused by the presence of stretching vibration. The FTIR spectra of PMMA microfluidic chips with a chloroform film adhesive and PMMA without an adhesive layer are remarkably similar, with notable variations in the locations of the lines suggesting wetness, which is consistent with prior results [7][8][9][10]."" Figure 5: FTIR spectrum of PMMA microfluidic chips and FTIR spectrum of PMMA microfluidic chip with chloroform adhesive.…”

“…As a result, the residual surface becomes smoother than before ablation. As seen in Figure (10), with a scan speed of 250 mm/s, a lower laser scan results in a smoother surface, Increasing the laser scanning speed (the number of times the laser passes) leads to a decrease in the depth of the channels along with a decrease in the roughness as well. This is because the second laser pass removes the roughness resulting from the previous laser passing pattern.…”

Synthesis and Physical Characterization of PMMA/PP and PMMA/ PAN Composites for Denture Applications

“…In addition, it could be attributed to the fact of the spaces and voids between the filaments that exist in both types of fibers that lead to difficulties in heat transfer procedure through the composite materials [35]. Also, this behavior could be due to the poor interfacial adhesion within the polymer matrix upon the increase of the additive percentage [9]. Thermal conductivity was decreased at the highest fibers ratio 7.5%Wt., for the PAN.…”

“…Special materials are used as polymers boosters such as particles in different type; metals and metals oxide [6], Al2O3 [7], TiO2 [8], ZrO2 and Pd [4]. In addition, different type of food peels [9,10,11]. Were used.…”

Water Temperature Effect on Hardness and Flexural Strength of (PMMA/TiO2 NPs) for Dental Applications

“…Moreover, during the time frequent biting endues deformation effect, which represents another kind of failure 5 . Since it is used in this application, there were many researches who attempt to enhance this acrylic resin mechanical properties such as flexural strength, impact resistance, hardness and other important feature 4,[6][7][8][9] . In flexural strength, the weakness was due to brittle nature at glass transition temperature, which is about 110 C o , in addition to cyclic loading ability.…”