نتایج جستجو برای: metal ion release

تعداد نتایج: 588081  

Journal: :journal of dental school, shahid beheshti university of medical sciences 0
سوده طهماسبی soodeh tahmasbi dental school, shahid beheshti university of medical sciences, tehran-iran.، دانشکده دندانپزشکی، دانشگاه علوم پزشکی شهید بهشتی. محمد قربانی mohammad ghorbani sharif university of technilogyدانشکده مهندسی مواد، دانشگاه صنعتی شریف. طاهره شیخ tahereh sheikh یدا... یعقوب نژاد yadollah yaghoubnejad sharif university of technilogyدانشکده مهندسی مواد، دانشگاه صنعتی شریف.

objective: corrosion resistance is among the most important properties of metal alloys used in the oral cavity. consumption of acidic foods reduces the salivary ph and intensifies the corrosion of brackets and orthodontic wires. this study aimed to compare electro galvanic corrosion of different orthodontic brackets and wires and determine the amount of ions released into acidic artificial sali...

ژورنال: مجله دندانپزشکی 2020

Background and Aims: All metal components of orthodontic appliances are somewhat corroded in the oral environment due to some changes in chemical, mechanical, thermal, microbiological and enzymatic factors which facilitates ion release. Ionic release can result in a discoloration of the surrounding soft tissue or allergic reactions in sensitive patients or even local pain in the area. In genera...

ژورنال: مجله دندانپزشکی 2005
استاد, سید ناصر, میرفضائلیان, علی , کندی بیدگلی, معصومه ,

Statement of Problem: One of newly presented base metal alloys (Minalux) is produced according to VeraBond2 alloy (Ni- Cr base) composition. Several studies showed that, cytotoxicity of base metal alloys can be occurred due to corrosion and element release. Purpose: This study evaluated the biocompatibility of these two base metal alloys in three steps: as cast, after polishing and after porcel...

پایان نامه :وزارت بهداشت، درمان و آموزش پزشکی - دانشگاه علوم پزشکی و خدمات بهداشتی درمانی مشهد - دانشکده دندانپزشکی 1390

objective: the objective of this study was to investigate the invitro fluoride release of four new self-adhesive resin cements; set (sdi, australia), breeze (pentron, usa), embrace wetbond (pulpdent, usa), g-cem (gc, japan) and to assess the bonding performance of these self-adhesive resin cements for bonding of orthodontic brackets. materials and methods: for fluoride release experiment, six ...

2005

STANDARD METAL-ON-METAL TOTAL HIP REPLACEMENT *Moroni A, **Savarino L, *Cadossi M, **Greco M, **Baldini N, *Giannini S * Rizzoli Orthopaedic Institute, Bologna, Italy **Laboratory for Pathophysiology of Orthopaedic Implants, Rizzoli Orthopaedic Institute, Bologna, Italy [email protected] INTRODUCTION Modern metal-on-metal (MOM) hip resurfacing has been introduced as a less invasive method of join...

ژورنال: مجله دندانپزشکی 2011
امینی, فریبرز, ثبوتی, فر‌هاد, شریعتی, مهسا, نوشاد حقیقی, زینب ,

Background and Aims: Considering the application of recycled metallic brackets in orthodontic treatments and probably more resultant metal ion release, which can cause cytotoxic side effects, this study was set up to assess the effect of recycling process of orthodontic brackets on metal ion release.Materials and Methods: In this experimental study, 80 Discovery direct bond brackets (Dentarum, ...

2015
William J. Cundy Annika R. Mascarenhas Georgia Antoniou Brian J. C. Freeman Peter J. Cundy

STUDY DESIGN Prospective pilot study. OBJECTIVES The aim of this study was to measure titanium, niobium and aluminium levels in various intraoperative and postoperative samples to determine patterns of metal ion release that occur within the first month following instrumented spinal fusion. Raised serum metal ion levels are reported following instrumented spinal fusion in adolescent idiopathi...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه رازی - دانشکده علوم 1389

fluorescence chemical sensors for the highly sensitive and selective determination of pb2+ , hg2+, co2+ and fe3+ ions in aqueous solutions are described. the ion sensing system was prepared by incorporating lipophilic ligand (l) as a neutral ion-selective fluoroionophore in the plasticized pvc membrane containing sodium tetraphenylborate or potasium tetrakis (p-chlorophenyl) borate as a liphoph...

Journal: :Protein science : a publication of the Protein Society 2002
Ewald T J van den Bremer Wim Jiskoot Richard James Geoffrey R Moore Colin Kleanthous Albert J R Heck Claudia S Maier

Nano-electrospray ionization time-of-flight mass spectrometry (ESI-MS) was used to study the conformational consequences of metal ion binding to the colicin E9 endonuclease (E9 DNase) by taking advantage of the unique capability of ESI-MS to allow simultaneous assessment of conformational heterogeneity and metal ion binding. Alterations of charge state distributions on metal ion binding/release...

Journal: :Journal of oral rehabilitation 2008
S K Al-Salehi P V Hatton A Johnson A G Cox C McLeod

There are concerns that tooth bleaching agents may adversely affect dental materials. The aim of this study was to test the hypothesis that increasing concentrations of hydrogen peroxide (HP) are more effective than water at increasing metal ion release from two typical dental casting alloys during bleaching. Discs (n = 28 for each alloy) were prepared by casting and heat treated to simulate a ...

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