introduction: the aim of this study was to evaluate the amount of dentine removed after canal preparation using stainless steel (ss) hand instruments or rotary profile instruments. materials and methods: thirty-six extracted human teeth with root canal curvatures less than 30º were embedded in clear polyester resin. the roots were cut horizontally at apical 2, 4 and 7 mm. dentin thickness was m...

Abstract This research investigates the process behaviour by prediction of pull force required to drag raw materials through heated die at different reinforcing material configuration during pultrusion. Pultrusion is a continuous manufacturing that widely used in manufacture for composite profiles. A specially designed device, friction virtue pulling on ‘resin impregnated’ fibres with both liqu...

This study aims to evaluate the flexural properties and associated failure mechanisms of a reactive thermoplastic relative traditional thermosetting resin systems (polyester, vinylester, epoxy) for potential application in marine vessels over 50 m length, as part H2020 FIBRESHIP project. All are compatible with vacuum assisted liquid infusion manufacturing technique commonly used small/medium s...

Biopolyester (PHAs = polyhydroxyalkanoates) composed of hydroxy fatty acids represent a rather complex class of storage polymers synthesized by various eubacteria and archaea and are deposited as water-insoluble cytoplasmic nano-sized inclusions. These spherical shell-core particles are composed of a polyester core surrounded by phospholipids and proteins. The key enzymes of polyester biosynthe...

Plasma Electrolytic Oxidation (PEO) was applied to extruded ZM21 Mg alloys improve their corrosion resistance in a chloride-containing environment. PEO carried out DC mode and voltage control fluoride-free electrolyte. Potentiodynamic polarization tests 3.5 wt.% NaCl aqueous solution neutral salt spray (NSS) were out. Microstructural profilometric characterization, as well NSS performed differe...

An unsaturated polyester resin (UPR) mortar was applied to repair the damage tension zone's one-way reinforced concrete (RC) slabs. The load carrying capacity of patched RC slab is interest justify effectiveness repair. Yield Line Theory (YLT) may be used estimate slabs under concentrated load. results YLT are compared with experimental evaluate validity method. confirm that patching alters yie...

PURPOSE Comparison of the mechanical characteristics of meniscal repair fixation using horizontal sutures and six different sutures under submaximal cyclic and load to failure test conditions may aid physicians in selecting a suture type. METHODS A 2-cm long anteroposterior vertical longitudinal incision was created in six groups of bovine medial menisci. Lesions were repaired using a No. 2 s...

A composite materials were prepared using a polymeric blend of epoxy resin and unsaturated polyester as matrix material, nanoceramic powder Lead Zirconium Titanate reinforcement material in different adding ratios( 2wt % & 6wt ). Impact strength, surface hardness, thermal conductivity solutions absorption tests carried out for the samples. The pre-immersion results showed that ceramic to improv...

Polyhydroxyalkanoates (PHAs) are biopolyesters composed of hydroxy fatty acids, which represent a complex class of storage polyesters. They are synthesized by a wide range of different Gram-positive and Gram-negative bacteria, as well as by some Archaea, and are deposited as insoluble cytoplasmic inclusions. Polyester synthases are the key enzymes of polyester biosynthesis and catalyse the conv...