Spiros Zinelis

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Titanium nitride and/or nitrogen ion implanted coated dental materials have been investigated since the mid-1980s and considered in various applications in dentistry such as implants, abutments, orthodontic wires, endodontic files, periodontal/oral hygiene instruments, and casting alloys for fixed restorations. Multiple methodologies have been employed to(More)
PURPOSE The debonding load of heat-activated polymethylmethacrylate (PMMA) denture base resin material to a nickel-chromium-beryllium (Ni-Cr-Be) alloy conditioned by three different surface treatments and utilizing two different commercial bonding systems was investigated. MATERIALS AND METHODS Denture resin (Lucitone-199) was bonded to Ni-Cr-Be alloy(More)
PURPOSE The mechanical and interfacial characterization of laser welded Co-Cr alloy with two different joint designs. MATERIALS AND METHODS Dumbbell cast specimens (n=30) were divided into 3 groups (R, I, K, n=10). Group R consisted of intact specimens, group I of specimens sectioned with a straight cut, and group K of specimens with a 45° bevel made at(More)
BACKGROUND The aim of this study was the characterization of mechanical properties of representative types of orthodontic wires employing instrumented indentation testing (IIT) according to ISO 14577. METHODS Segments were cut from ten wires. The first six are made of stainless steel (SS), two are made of Ni-Ti, and the last two are made of titanium(More)
OBJECTIVE The aim of this study was to quantify the surface area, volume and specific surface area of endodontic files employing quantitative X-ray micro computed tomography (mXCT). MATERIAL AND METHODS Three sets (six files each) of the Flex-Master Ni-Ti system (Nº 20, 25 and 30, taper .04) were utilized in this study. The files were scanned by mXCT. The(More)
138 A study of Class III treatment: orthodontic camouflage vs orthognathic surgery Katherine Georgalis and Michael G. Woods 149 A multi-centre evaluation of multiple supernumerary premolar prevalence 165 Chemical and mechanical characteristics of contemporary thermoplastic orthodontic materials 171 Comparative evaluation of pulpal blood flow during incisor(More)
AIM: Development of an experimental setup capable of reliably recording changes of forces applied by an elastomeric chain, under constant strain, in real time and with continuous data recording and the study of differences in stress relaxation between open (with intermodular link) and closed (without link) chains of the same manufacturer. MATERIAL AND(More)
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