Stress whitening problem in thermoformed alumina trihydrate (ATH) reinforced poly(methyl methacrylate) (PMMA) was studied. In situ heavy-gage thermoforming of acrylics was entirely replicated under laboratory controlled conditions at different operation parameters. Samples were monitored with optical microscope after the completion of the thermoforming operation. For stress whitening quantifica...

OBJECTIVE To evaluate in vitro the effects of tooth whitening using gel with Amorphous Calcium Phosphate (ACP) on the bond strength of metal brackets. METHODS Thirty-six bovine incisors were sectioned at the crown-root interface, and the crowns were then placed in PVC cylinders. The specimens were divided into 3 groups (n = 12) according to whitening treatment and type of gel used, as follows...

Fluorescent whitening agents (FWAs) are the most widely used functional chemicals for the manufacture of printing and writing grades of paper. FWAs are used as internal or external additives for the surface treatment on the size press and coater. In spite of the extensive use of FWAs, no method has been established to analyze the FWA content in process water and paper products. Samples are typi...

The present study was performed to compare the antioxidative and whitening activities of fermented soybean extract (FSB) and non-fermented soybean extract (SB). Antioxidative and whitening activities of FSB and SB were evaluated by the determination of DPPH, superoxide radical and hydroxyl radical scavenging activities, linoleic acid inhibition activity, and tyrosinase inhibition activity. FSB ...

OBJECTIVE The primary purpose of this randomized, controlled, six-week clinical trial was to determine the effectiveness and safety of a new whitening dentifrice in removing extrinsic tooth stain and whitening teeth. An additional two-week exploratory study was conducted to determine whether the whitening or stain-prevention activity of the dentifrice would persist following cessation of use. ...

We propose a new method of speech enhancement based on auto gain control using two channel inputs. Auto gain control is considered to be less effective for reducing noise superimposed on speech, however, it has advantages on the problems of musical noise and spectral distortion of the speech. In this method, two operations are combined for obtaining accurate gain, of which, one is spectral subt...

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...

An algorithm for blind source separation based on several time-delayed second-order correlation matrices is proposed. The technique to construct the unmixing matrix employs rst a whitening step and then an approximate simultaneous diagonalisation of several time-delayed second-order correlation matrices. Its eeciency and stability are demonstrated for linear artiicial mixtures with 17 sources.

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...

At this time there are many ways to promote or advertise products attract consumers. One of the methods used is endorsement and influencer. This was also done by Scarlett whitening who influencer Tasya Farasya. study aims analyze identify relationship between endorsements influencers on buying interest in Scarlet Whitening products. The theory which has 4 indicators, namely: transactional inter...