<span lang="EN-US">The purpose of this study was to evaluate the effect rectangular region interest (ROI) size on modulation transfer function (MTF), develop radial ROI, and compare both ROIs performances for MTF measurement using a cylindrical polymethyl methacrylate (PMMA) phantom. The PMMA phantom used in rotated 45°. Four ROI were created measure value. sizes 3×41, 21×41, 41×41, 61×41...

A broadband absorber with high optical transparency is proposed and realized using an optimization-designed method. The absorber’s reflection, lossy, dielectric layers are considered for obtaining transparency. First, to maintain microwave absorption, the artificial structures of reflection layer designed on micron scale. Low square resistance achieved simultaneously. Then, considering structur...

This research was conducted to investigate the bond strength between artificial teeth and a thermoplastic denture base resin for injection molding with different surface preparations use in flexible removable partial dentures. Composite acrylic were bonded three types of resins (polyamide, polyester, polycarbonate) conventional heat-polymerized polymethyl methacrylate (PMMA) (control). The ridg...

The wear resistance of denture teeth is important to the longevity of removable prostheses of edentulous patients. The ability of denture teeth to maintain a stable occlusal relationship over time may be influenced by this property. The purpose of this in vitro study was to evaluate the wear resistance of polymethyl methacrylate (PMMA) denture teeth based on their chemical composition when oppo...

Nowadays, the trend to benefit from environmentally friendly waste and recycle it instead of incineration processes that can cause pollution in environment have a clean green is free work for long time without consumption damage. This study designed manufacture prosthetics limbs PMMA (polymethyl methacrylate) reinforced with different weight percentages paper layers (0%, 3%, 6%, 9%, 12%) by “ha...

This paper presents a slot antenna array with reconfigurable radar cross section (RCS). The system is formed by combining liquid absorber 2*2 array. consists of polymethyl methacrylate (PMMA) container, 45% ethanol layer, and metal ground,which attached to the surface incident wave can be absorbed rather than reflected in other directions when PMMA container filled ethanol, which reduces monost...

Owing to the excellent mechanical properties, polymethyl methacrylate (PMMA)/carbon nanotube (CNT) composite has been increasingly adopted in aerospace field, which is usually subjected various temperature conditions and supersonic aerodynamic loads. Using a molecular dynamics (MD)-based multiscale simulation, nonlinear forced vibration of PMMA/CNT plate investigated under coupled load conditio...

PURPOSE This study characterized the synthesis of a modified PMMA (Polymethyl methacrylate) denture acrylic loading platinum nanoparticles (PtN) and assessed its bacterial inhibitory efficacy to produce novel antimicrobial denture base material. MATERIALS AND METHODS Polymerized PMMA denture acrylic disc (20 mm × 2 mm) specimens containing 0 (control), 10, 50, 100 and 200 mg/L of PtN were fab...

PURPOSE The aim of this in-vitro investigation was to describe the effect of reinforcement with different fibers on impact strength of heat polymerized polymethyl methacrylate (PMMA) denture base resin and to analyze the effect of surface treatment of the fibers on the impact strength. MATERIALS AND METHODS The specimens were fabricated from the dies formed as per standard ASTM D4812. 2% by w...