نتایج جستجو برای: bleaching powder

تعداد نتایج: 53308  

Journal: :American journal of dentistry 2010
Yong Hoon Kwon Dong-Hee Shin Dong-In Yun Young-Joon Heo Hyo-Joung Seol Hyung-Il Kim

PURPOSE To examine the effect of hydrogen peroxide on the microhardness and color change of resin composites containing nanofillers. METHODS Three resin nanocomposites with three different shades and two different tooth whitening agents were used. The specimens were given a 3-week treatment with one of three protocols: (1) 7 hours/day treatment of carbamide peroxide (CP) + 17 hours/day immers...

Journal: :The Journal of clinical dentistry 2005
Van B Haywood Rafael Cordero Kellie Wright Linda Gendreau Ronald Rupp Mitchell Kotler Sonya Littlejohn Joyce Fabyanski Stuart Smith

OBJECTIVE This research systematically evaluated the use of a clinically proven desensitizing dentifrice prior to a bleaching regimen in a randomized, multi-center, parallel group, open label clinical study following Good Clinical Practice guidelines. METHODOLOGY Fourteen dental offices in West Palm Beach, Florida participated in the study during April/May 2004. Fourteen days prior to bleachi...

2014
Verena Schoepf Malcolm T. McCulloch Mark E. Warner Stephen J. Levas Yohei Matsui Matthew D. Aschaffenburg Andréa G. Grottoli

Coral skeletal boron isotopes have been established as a proxy for seawater pH, yet it remains unclear if and how this proxy is affected by seawater temperature. Specifically, it has never been directly tested whether coral bleaching caused by high water temperatures influences coral boron isotopes. Here we report the results from a controlled bleaching experiment conducted on the Caribbean cor...

Introduction: Bleaching products with oxidizing mechanism can exert side effects on the restorative materials existing in the oral cavity. Since bleaching agents are applied in different concentrations, the present study aimed to compare the effect of different bleaching regims of carbamide peroxide on microhardness of Z250 microhybride composite. Methods: In this in vitro study , 32 specime...

The structural and bleaching properties of nitric acid-activated Nteje clay was studied to investigate its ability to serve as an alternative to the high cost imported bleaching earth. The clay was mined, sun-dried, grinded, and reacted with different concentrations of nitric acid, ranging from 2 mol.L-1 to 15 mol.L-1. The un-activated and activated samples were characterized to study the struc...

Journal: :Remote Sensing 2018
William J. Skirving Susana Enríquez John D. Hedley Sophie Dove C. Mark Eakin Robert A. B. Mason Jacqueline L. De La Cour Gang Liu Ove Hoegh-Guldberg Alan E. Strong Peter J. Mumby Roberto Iglesias-Prieto

The National Oceanic and Atmospheric Administration’s Coral Reef Watch program developed and operates several global satellite products to monitor bleaching-level heat stress. While these products have a proven ability to predict the onset of most mass coral bleaching events, they occasionally miss events; inaccurately predict the severity of some mass coral bleaching events; or report false al...

2001
M. W. Gleeson

In the 1980s and early 1990s, coral reef bleaching events of unprecedented frequency and global extent were observed. Elevated water temperature is suspected as the primary causal stress of mass bleaching events from this period. The relationship between sea surface temperatures (SSTs) and coral bleaching events was investigated using National Oceanic and Atmospheric Administration (NOAA) Multi...

Journal: :Brazilian dental journal 2014
Erica Moreno Zanconato-Carvalho João Felipe Bruniera Natália Spadini de Faria Vivian Colucci Danielle Cristine Messias

Surface treatment of dentin before the bleaching procedure may affect its permeability and influence the bond strength of restorative materials. This study evaluated the influence of surface treatment before the bleaching on shear bond strength (SBT) of restorative materials to intracoronal dentin. Dentin slabs were subjected to surface treatment: no bleaching (control - CON), no surface treatm...

Journal: :Journal of dentistry 2008
Hui-Ping Chen Chih-Han Chang Jia-Kuang Liu Shu-Fen Chuang Jin-Yi Yang

OBJECTIVES To evaluate the effects of fluoridated bleaching agents and post-bleaching fluoridation treatment on the whitening efficiency and microhardness of bovine enamel. METHODS Twenty five freshly extracted bovine incisors were cut into halves, embedded and then divided into the following five groups: Group 1, untreated controls; Group 2, treatment with 10% carbamide peroxide (CP) bleachi...

D Kumar P.C Tewari R Khanduja

This paper presents the steady state behavior and maintenance planning of the bleaching system in a paper plant. The paper plant comprises of various systems including feeding, chipping, digesting, washing, bleaching, screening, stock preparation and paper making, etc. One of the most important functionaries of a paper plant, on which quality of paper depends, is the bleaching system, where rem...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید