Results 31 to 40 of about 91,863 (168)

Dual resin cement knoop hardness after different activation modes through dental ceramics.

Brazilian Dental Journal, 2010
This study investigated the influence of ceramic compositions on Knoop Hardness Number (KHN) immediately and 24 h after polymerization and the effect of activation modes on the KHN of a resin cement.
T. A. Valentino, G. Borges, Luis Henrique Borges, J. Vishal, L. Martins, L. Correr-Sobrinho   +5 more
semanticscholar   +1 more source

Knoop hardness of enamel and shear bond strength of brackets bonded with composite resin with and without fluoride Dureza Knoop do esmalte e resistência ao cisalhamento de braquetes colados com resina composta com e sem flúor

Dental Press Journal of Orthodontics, 2012
OBJECTIVE: The aim of this study was to evaluate the Knoop hardness of enamel, shear bond strength and failure pattern (adhesive, bracket/resin interface or mixed) after bonding and debonding brackets, using resin composite with fluoride (Ortho Lite Cure,
Silvia Amélia Scudeler Vedovello, Marcelo Grigoletto, Mário Vedovello Filho, Heloísa Cristina Valdrighi, Mayury Kuramae   +4 more
doaj   +1 more source

Can surface protection prevent the loss of hardness on dentin and composite resin surfaces exposed to erosive challenges?

Journal of Oral Research, 2020
Objective: This study investigated the effect of endogenous erosion on the microhardness of dentine and a nanofilled composite resin. Procedures for preventing erosion were also studied.
Patricia Akemi Nishitani Shibasaki, Janaina Emanuela Damasceno, Mariana Menezes Vaz de Queiroz, Max José Pimenta Lima, Roberto Paulo Correia de Araújo, Richard Mark Foxton, Andrea Nóbrega Cavalcant   +6 more
doaj   +1 more source

Analysis of the Effect of Dental Chair Light on the Knoop Hardness of Composite Resin While Light Curing with QTH and LED Light Units

, 2012
Dental chair lights have been known to rapidly polymerize lightcured composites beyond the point of workability. Often in our dental clinics we are advised to switch off the dental chair light while light curing of dental composites.
Bandish Parekh, S. Sathe, V. Hegde, S. Patil   +3 more
semanticscholar   +1 more source

In Vıvo Effects Of Orthocryl On The Remıneralızatıon Of Acıd-Softened Enamel

Turkish Journal of Orthodontics, 1992
In vivo effects of Orthocryl on acid-softened enamel are investigated. Demineralized enamel slabs are mountened in appliances and after control and treatment periods of one week the enamel specimens removed from the appliances and evaluated for ...
Seval Ölmez, Engin Usmen
doaj   +1 more source

Hydrolytic degradation of composite resins: effects on the microhardness

Materials Research, 2003
The purpose of this investigation was to evaluate the microhardness of two laboratory-processed composites (Artglass; belleGlass) and two direct placement composites (Filtek Z250; Alert), after aging in distilled water. Twenty cylinders (8 mm diameter; 2
Josué Martos, Prudêncio Willy Rodo Osinaga, Elisabeth de Oliveira, Luis Antônio Suita de Castro   +3 more
doaj   +1 more source

Effects of a bleaching agent on properties of commercial glass-ionomer cements [PDF]

Restorative Dentistry & Endodontics, 2018
ObjectivesThis study evaluated the effects of a bleaching agent on the composition, mechanical properties, and surface topography of 6 conventional glass-ionomer cements (GICs) and one resin-modified GIC.Materials and MethodsFor 3 days, the specimens ...
Fernanda Lúcia Lago de Camargo, Ailla Carla Lancellotti, Adriano Fonseca de Lima, Vinícius Rangel Geraldo Martins, Luciano de Souza Gonçalves   +4 more
doaj   +1 more source

Effect of light-curing units, post-cured time and shade of resin cement on knoop hardness.

Brazilian Dental Journal, 2009
The aim of this study was to evaluate the Knoop hardness after 15 min and 24 h of different shades of a dual-cured resin-based cement after indirect photoactivation (ceramic restoration) with 2 light-curing units (LCUs).
R. V. Reges, A. R. Costa, A. Correr, E. Piva, R. Puppin-Rontani, M. Sinhoreti, L. Correr-Sobrinho   +6 more
semanticscholar   +1 more source

Influência das fontes fotoativadoras led e halógena e do tempo de exposição na microdureza knoop de compósitos odontológicos Influence of led and halogen light-curing units and exposure time in knoop hardness of composites

, 2010
The aim of this study was to evaluate top and bottom hardness of composite (Z2503MESPE) cured with two LED lights (LD13 – GGDent with crystal tip [LED1] and LD13 – GGDent – with fiber optic tip [LED2]) and halogen light (Optilux 501-Demetron[HAL]) under ...
M. Cecilia, Caldas Giorgi, C. Dias, Luís A. Alexandre, M. Sartini   +4 more
semanticscholar   +1 more source

Effect of the increase of energy density on Knoop hardness of dental composites light-cured by conventional QTH, LED and xenon plasma arc.

Brazilian Dental Journal, 2005
The aim of this study was to evaluate the effect of the increase of energy density on Knoop hardness of Z250 and Esthet-X composite resins. Cylindrical cavities (3 mm in diameter X 3 mm in depth) were prepared on the buccal surface of 144 bovine incisors.
A. Correr, M. Sinhoreti, L. C. Sobrinho, R. Tango, L. F. Schneider, S. Consani   +5 more
semanticscholar   +1 more source