Results 301 to 310 of about 5,176 (336)

Effects of Bleaching with Carbamide Peroxide Gels on Microhardness of Restoration Materials

Journal of Esthetic and Restorative Dentistry, 2003
ABSTRACTThe objective of this in vitro study was to quantitatively assess the effects of bleaching with 10 and 15% carbamide peroxide (CP) on restoration materials by performing superficial micro‐hardness analysis. Acrylic cylindrical containers (4 × 2 mm) were filled with the following restoration products: Charisma (Heraues Kulzer, Vila Santa ...
Campos, Inger, Briso, André Luiz Fraga, Pimenta, Luiz André Freire, Ambrosano, Gláucia   +3 more
openaire   +4 more sources

Effects of phosphoric acid on bovine enamel bleached with carbamide peroxide

European Journal of Oral Sciences, 2008
The aim of this study was to measure the demineralization capacity of 37% phosphoric acid on bovine enamel at different time‐points after bleaching with 30% carbamide peroxide. Five, 4 × 4‐mm sections were obtained from the enamel of 10 bovine incisors.
Jorge Bolaños-Carmona, Santiago González-López, Purificación Sánchez-Sánchez, Carmen L. S. G. De Medeiros, María Victoria Bolaños-Carmona   +4 more
openaire   +3 more sources

Microcomputerised tomography evaluation of 10% carbamide peroxide applied to enamel

Journal of Dentistry, 2005
There is still some controversy in the dental literature whether carbamide peroxide bleaching causes demineralization of teeth. One of the reasons for this controversy is that there is as yet no reliable, non-destructive in vitro method for assessing mineral loss in bleached teeth.
Wood, D, Efeoglu, N, Efeoglu, CANDAN
openaire   +4 more sources

Effect of Whitening Agents Containing Carbamide Peroxide on Cariogenic Bacteria

Journal of Esthetic and Restorative Dentistry, 2000
ABSTRACT Purpose: The purpose of this study was to investigate the in vitro antibacterial effects of three different carbamide peroxide products (Nitewhite®, Opalescence®, and Proxigel®) on cariogenic microorganisms (mutans streptococci [MS] and lactobacilli), and to evaluate the effects of a 10% carbamide peroxide solution (Proxigel®) on salivary ...
Ralph H. Leonard, Carolyn D. Bentley, James J. Crawford   +2 more
openaire   +3 more sources

Carbamide peroxide and its use in oral hygiene and health

Dental Update, 2017
Plaque accumulation, dental caries and periodontal disease are an increasing concern for elderly, special care and orthodontic patients as a result of numerous predisposing factors which make maintenance of adequate oral hygiene difficult, even with traditional oral hygiene practices.
Linda Greenwall, Joseph Greenwall-Cohen
openaire   +2 more sources

Durability of bleaching results achieved with 15% carbamide peroxide and 38% hydrogen peroxide in vitro

The European journal of esthetic dentistry : official journal of the European Academy of Esthetic Dentistry, 2011
The aim of this study was to assess the durability of bleaching results achieved with (1) 15% carbamide peroxide home bleaching and (2) 38% hydrogen peroxide in-office bleaching. A total of 231 extracted anterior teeth were randomly divided into three groups (n = 77 in each group) with comparable mean baseline L*-values (68.24 ± 0.8): a non-bleached ...
Knösel, M, Reus, M, Rosenberger, A, Attin, T, Ziebolz, D   +4 more
openaire   +3 more sources

Oxidation of methyl phenyl sulfide by carbamide peroxide in the presence of activators [PDF]

Theoretical and Experimental Chemistry, 2010
The oxidation of methyl phenyl sulfide by carbamide peroxide in water and water–ethanol mixtures proceeds at the same rates as oxidation by hydrogen peroxide. In the presence of ammonium bicarbonate, the reaction proceeds through a pathway including HCO 4 - as a more active oxidizing agent than H2O2.
N. V. Lakhtarenko, K. V. Matvienko, N. A. Taran, Anatolii F. Popov, L. N. Vakhitova, A. V. Skrypka   +5 more
openaire   +1 more source

Preparation and characterization of calcium-shellac spheres as a carrier of carbamide peroxide

Journal of Microencapsulation, 2008
This paper describes a novel approach to prepare and characterize calcium-shellac spheres as a carrier of a tooth whitening agent carbamide peroxide. Calcium-shellac spheres were prepared using an extrusion technique based on dropping aqueous ammonium shellac solution into calcium chloride solution.
Jing Xue, Zhibing Zhang
openaire   +3 more sources

Bond Strength of Composite Resin to Enamel Bleached with Carbamide Peroxide

Journal of Esthetic and Restorative Dentistry, 1991
Bleaching with 35 percent hydrogen peroxide causes enamel surface changes, which result in lower bond strengths of composite resin. Although a previous SEM study showed that home bleaching with 10 percent carbamide peroxide does not cause such surface changes, the results of our study indicate that carbamide peroxide bleaching reduces the shear bond ...
Edward J. Swift, Gerald E. Denehy, Elizabeth Cvitko, Jose Antonio F. Pires   +3 more
openaire   +3 more sources

Higher‐Concentration Carbamide Peroxide Effects on Surface Roughness of Composites

Journal of Esthetic and Restorative Dentistry, 2002
ABSTRACT Background: Ten percent carbamide peroxide has been used extensively within the dental profession for the purpose of bleaching teeth. Although this method has been successful, the use of higher‐concentration carbamide peroxides (20–35%) for home bleaching has increased substantially in the past few years.
Grant R. Hartup, Robert E. Langsten, William J. Dunn, David F. Murchison   +3 more
openaire   +3 more sources