نتایج جستجو برای: qth

تعداد نتایج: 267  

2012
Telmo Bandeira Berthold Guilherme Cerveira Roger Berthold Luciane Hahn Ana Maria Spohr Ernani Menezes Marchioro

Metodologia: discos com resina Transbond XT foram fotoativados por 10, 20 e 30 segundos com QTH (Curing light XL 3000) ou com PAC (Apollo 95E) por 1, 2 e 3 segundos. A resina composta foi analisada por meio de espectrofotometria infravermelha (FTIR) e pelo teste de dureza Knoop (KHN). A temperatura na ponta dos aparelhos foi também avaliada. Os resultados foram analisados usando ANOVA e Tuckey ...

خسروی, دکتر کاظم, خواجه, دکتر مهدی, فیض, دکتر عطیه,

مقایسه کارایی دو دستگاه سخت کننده نوری LED و QTH در پلیمریزه کردن سمان رزینی دوال کیور موجود در زیر انله سرامیکی دکتر عطیه فیض1- دکتر کاظم خسروی2- دکتر مهدی خواجه3 1- استادیار گروه آموزشی ترمیمی دانشکده دندانپزشکی دانشگاه علوم پزشکی اصفهان. 2- دانشیار گروه آموزشی ترمیمی دانشکده دندانپزشکی دانشگاه علوم پزشکی اصفهان. 3- دندانپزشک. چکیده زمینه و هدف: سمانهای رزینی دوال کیور جهت چسباندن ترمیمهای غی...

Journal: :journal of dental research, dental clinics, dental prospects 0
seyd mostafa mousavinasab ian meyers

background and aims. the aim of the present study was to compare the efficacy of quartz tungsten halogen (qth) and light emitting diode (led) curing lights on polymerization of resin composite. materials and methods. a hybrid resin composite was used to prepare samples which were cured using two qth and ten led light curing sources. twelve groups, each containing ten samples, were prepared usin...

2010
Nilufer Celebi Beriat Ahmet Atila Ertan Senay Canay Aylin Gurpinar Mehmet Ali Onur

OBJECTIVES The aim of this study was to compare the cytotoxic effects of various dental composites polymerized with two different curing units. METHODS Disc-shaped test samples of composites Filtek Z250, Filtek A110, Filtek P60, Filtek Supreme, and SDI Rok were polymerized using one quartz tungsten halogen (QTH) and one light emitting diode (LED) light curing unit (LCU), namely Optilux 501 (Q...

Journal: :Journal of oral science 2008
Ricardo D Guiraldo Simonides Consani Thais Lympius Luis F J Schneider Mario A C Sinhoreti Lourenço Correr-Sobrinho

The aim of this study was to determine the effect of different types of composites (Filtek Z250, Esthet X and Filtek Supreme) and dentin thicknesses (0.5 or 1.0 mm) on the generation of heat during photoactivation by QTH (conventional halogen light), LED (light emitting diode), and PAC (xenon plasma light) light-curing units. Temperature changes were recorded with a thermocouple type K connecte...

2009
Flávio HB Aguiar Kelly RM Andrade Débora AN Leite Lima Gláucia MB Ambrosano José R Lovadino

Correspondence: Flávio HB Aguiar Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Av. Limeira, 901, Piracicaba, SP, Brazil 13414-903 Tel +55 19 2106 5340 Fax +55 19 2106 5218 Email [email protected] Abstract: The aim of this in vitro study was to evaluate the influence of light-curing units and different sample thicknesses on the microhardness of ...

Journal: :Brazilian oral research 2010
William Cunha Brandt Luis Felipe Jochims Schneider Elisabete Frollini Lourenço Correr-Sobrinho Mário Alexandre Coelho Sinhoreti

The aim of this study was to evaluate: (i) the absorption of photo-initiators and emission spectra of light curing units (LCUs); and (ii) the degree of conversion (DC) of experimental composites formulated with different photo-initiators when activated by different LCUs. Blends of BisGMA, UDMA, BisEMA and TEGDMA with camphorquinone (CQ) and/ or 1-phenyl-1,2-propanedione (PPD) were prepared. Dim...

Journal: :Brazilian dental journal 2007
Mário Alexandre Coelho Sinhoreti Izabella Paola Manetta Rubens Nisie Tango Nelson Tetsu Iriyama Rafael Leonardo Xediek Consani Lourenço Correr-Sobrinho

This study evaluated, using Knoop hardness test, the polymerization depth of Rely-X dual-cured resin cement activated by chemical reaction alone (control group) or by chemical/physical mode with light curing through a 1.5-mm-thick ceramic layer (HeraCeram). Bovine incisors had their buccal surface flattened and hybridized. On this surface, a rubber mould (5 mm diameter; 1 mm high) was bulk fill...

Journal: :Journal of oral science 2010
Christos Rahiotis Katerina Patsouri Nick Silikas Afrodite Kakaboura

We evaluated the curing efficiency of 4 high-intensity light-emitting diode (LED) devices by assessing percentage of residual C=C (%RDB), surface microhardness (SM), depth of cure (DC), percentage of linear shrinkage-strain (%LS), and percentage of wall-to-wall contraction (%WWC). The light-curing units tested were a QTH light, the Elipar TriLight (3M/ESPE), and 4 LED devices - the Allegro (Den...

1998
Reese Harvey John Zweck

A canonically defined mod 2 linear dependency current is associated to each collection ν of sections, ν 1 , ..., ν m , of a real rank n vector bundle. This current is supported on the linear dependency set of ν. It is defined whenever the collection ν satisfies a weak measure theoretic condition called " atomicity ". Essentially any reasonable collection of sections satisfies this condition, va...

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