The purposes of this study are: (1) determine the color of the twenty shades in the Ivoclar’s Chromascop shade guide, (2) determine the color representation of the shade guide described as coverage error (CE), and (3) compare this shade guide with the Vita Classical and Bioform shade guides. The spectral data was collected using Beckman model DU reflectance spectrophotometer equipped with an in...

The purpose of this study was to evaluate the training effect and to determine the optimal training protocol for a recently developed online colour training system. Seventy students participated in the evaluation. They first completed a baseline test with shade guides (SGT) and the training system (TST), and then trained with one of the three system training methods (Basic colour training for g...

This paper presents the use of multitemporal remote sensing data for monitoring land cover changes in Acre State, Brazilian Amazônia. The 2000 Landsat ETM+, the 1990 Landsat TM, and 1980 Landsat MSS were used. The 2005 and 2007 MODIS images were also used to map deforestation occurred during the recent years and to map burned areas occurred in the 2005 dry year. The Landsat and MODIS images wer...

First, we have to ask, who are these people? And there’s no easy answer. These are not well-defined groups with membership lists. And their activities have spawned many imitators and fellowtravellers. There are also some distinctions between the groups defined by the ‘members’ themselves. This makes labels difficult: ‘hacktivists’, ‘activists’, ‘hackers’, ‘members’ – even the word ‘group’ itsel...

PURPOSE To identify the most frequent natural tooth colors using the Easyshade Compact (Vita -Zahnfabrik) spectrophotometer on a sample of the Spanish population according to the 3D Master System. MATERIALS AND METHODS The middle third of the facial surface of natural maxillary central incisors was measured with an Easyshade Compact spectrophotometer (Vita Zahnfabrik) in 1361 Caucasian Spanis...

Flying a quadrotor helicopter requires at least a means for stabilization control. Although efficiently stabilizing a quadrotor is itself an extensive research field, adding autonomous control poses even more challenging problems: the underlying quadrotor platform must provide sufficiently precise sensors with high update rates, the mechanical parts should not incur large update delays, and the...

Objective: To evaluate the reliability and accuracy of 4 electronic devices for determining dental shades. Methods: The 4 devices evaluated were the SpectroShade (spectrophotometer), ShadeVision (digital camera with colorimeter), VITA Easyshade (spectrophotometer), and ShadeScan (digital camera with colorimeter). All of the devices were calibrated according to manufacturer instructions. Three t...

ABSTRACT Tooth bleaching is one of the most conservative aesthetic techniques. At-home and in-office may be performed, as well combination both As this done in different manners, distinct orders combinations were proposed report. A 24 years-old man, whose upper central incisor canine shades A2 A3 respectively, was initially treated by chair-side with 40-min application 40% hydrogen peroxide (HP...

OBJECTIVE This clinical study evaluated the color longevity after one-year of at-home bleaching with 10% carbamide peroxide (CP) in smokers and nonsmokers. METHODS Sixty patients, 30 smokers and 30 non-smokers were subjected to bleaching with 10% CP during three hours daily for three weeks. The color was measured at baseline and one week, one month and one year after the completion of dental ...