نتایج جستجو برای: degree of whitening

تعداد نتایج: 21168356  

2016
Jeffrey D. Hillman Emily McDonell Charles H. Hillman Martin Handfield

Aim: Oral care probiotics that incorporate hydrogen peroxide-producing strains of Streptococcus oralis may represent an effective means of naturally whitening teeth, when whitening is indicated. The purpose of this study was to evaluate the cosmetic benefit (“whitening effect”) of a laboratory culture of S. oralis strain KJ3® and further investigate its mechanism of action. Methods: Ceramic dis...

2013
Fatemeh Velayati Moghadam

Aim: This randomizes clinical trial evaluated of color change, rebound effect and tooth sensitivity associated with power and at-home bleaching techniques. Methods and Materials: Anterior teeth of twenty volunteers were randomized into two balanced groups (n=20) ; Power and at-home bleaching. Color was recorded before bleaching ,immediately after bleaching, at two weeks, one, three and six mont...

2017
Thair Takesh Anik Sargsyan Matthew Lee Afarin Anbarani Jessica Ho Petra Wilder-Smith

Aims The aim of this project was to evaluate the effects of 2 different whitening strips on color, microstructure and roughness of tea stained porcelain and composite surfaces. Methods 54 porcelain and 72 composite chips served as samples for timed application of over-the-counter (OTC) test or control dental whitening strips. Chips were divided randomly into three groups of 18 porcelain and 2...

Journal: :Indian journal of dental research : official publication of Indian Society for Dental Research 2011
Danilo Barral de Araújo Luciana Rodrigues Silva Elisângela de Jesus Campos Roberto Paulo Correia de Araújo

BACKGROUND The tooth whitening substances for extrinsic use that are available in Brazil contain hydrogen peroxide or carbamide peroxide. Several studies have attributed the appearance of lesions in the enamel morphology, including hypersensitivity, to these substances. Such lesions justify fluoride therapy and application of infrared lasers, among other procedures. However, there is no consens...

Journal: :Computational Statistics 2022

Abstract The inverse square root of a covariance matrix is often desirable for performing data whitening in the process applying many common multivariate analysis methods. Direct calculation not available when either singular or nearly singular, as occurs high dimensions. We develop new methods, which we broadly call polynomial , to construct low-degree empirical has similar properties true (sh...

2005
LI Yan

Ecological environment quality comprehensive evaluation evaluate different cells’ ecological environment quality, on the basis of region eco-environment investigation , the indexes and math methods selected according to the region, to discover the problems and put forward comprehensive father measures. In electronic government spatial decision-making assistant systems, Estimate the region’s eco...

2000
K. J. Friston J.-B. Poline

This paper concerns temporal filtering in fMRI timeseries analysis. Whitening serially correlated data is the most efficient approach to parameter estimation. However, if there is a discrepancy between the assumed and the actual correlations, whitening can render the analysis exquisitely sensitive to bias when estimating the standard error of the ensuing parameter estimates. This bias, although...

2013
Wyman Chan Ryan Banks Edward Lynch Martin Grootveld

A multicomponent evaluation of the oxidative consumption of salivary biomolecules by a hydrogen peroxide (H2O2)containing tooth-whitening formulation has been performed using high-resolution proton (H) nuclear magnetic resonance (NMR) spectroscopy. Unstimulated human saliva samples (n = 10) were treated with aliquots of supernatants derived from 1) the H2O2-containing whitening gel, 2) the corr...

Journal: :Dentistry 2017
Thair Takesh Anik Sargsyan Afarin Anbarani Jessica Ho Petra Wilder-Smith

OBJECTIVE The goal of this study was to evaluate the enamel whitening effects of 2 new test formulations, one of which was a rinse, and the other a whitening strip. MATERIALS AND METHODS Forty enamel chips were prepared from 20 healthy extracted teeth (2 from each tooth). After pre-staining and colorimetry to measure L* and b* values, 20 matched samples were immersed in either test or control...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید