نتایج جستجو برای: carbamide

تعداد نتایج: 538  

Introduction: Bleaching treatments may negatively affect the surface quality of composite restorations existing in the mouth. This study sought to assess the effect of 16% and 35% carbamide peroxide on microhardness of silorane-based versus two methacrylate-based composite resins. Methods: A total of 54 discs were fabricated from FiltekP90 (P90), FiltekZ350XT(Z350) Enamel and Filtek Z250(Z25...

2015
Ruchi Thakur Anand L Shigli Divya S Sharma Gagan Thakur

AIM To evaluate the effects of postbleaching antioxidant application fluoridation treatment on the surface morphology and microhardness of human enamel. MATERIALS AND METHODS Ten freshly extracted human maxillary central incisors were cut at cementoenamel junction. Crown portion was sectioned into six slabs which were divided into five groups: group A - untreated controls; group B - 35% carba...

2016
Manal Hussain Abd-alla

This split-arch clinical study was performed to compare the effects of using 10% carbamide peroxide bleaching agent for one hour twice a day with its use for 8 hours/night on tooth color change, color stability and sensitivity. Method: Bleaching trays, with reservoirs for the six maxillary anterior teeth, were fabricated for 12 volunteers. The trays were cut into two halves between the left and...

2011
Flávio Fernando Demarco Sônia Saeger Meireles Hugo Ramalho Sarmento Raquel Venâncio Fernandes Dantas Tatiana Botero Sandra Beatriz Chaves Tarquinio

This review investigates erosion and abrasion in dental structures undergoing at- home bleaching. Dental erosion is a multifactorial condition that may be idiopathic or caused by a known acid source. Some bleaching agents have a pH lower than the critical level, which can cause changes in the enamel mineral content. Investigations have shown that at-home tooth bleaching with low concentrations ...

Journal: :Dental materials journal 2009
Toshiaki Ushigome Shinji Takemoto Masayuki Hattori Masao Yoshinari Eiji Kawada Yutaka Oda

Carbamide peroxide and hydrogen peroxide are used as the main agents in vital tooth bleaching. In this study, the influence of peroxide treatment on cross-sectional morphology and mechanical property was investigated. A 3 x 5-mm window of enamel on the labial surface of a bovine tooth was exposed to immersion in 10% or 30% carbamide peroxide or hydrogen peroxide for 30 or 180 min. After immersi...

Journal: :Scientific and Technical Journal of Information Technologies, Mechanics and Optics 2016

Journal: :Journal of the American Dental Association 2008
Kiet A Ly Peter Milgrom Marilynn Rothen

BACKGROUND The authors provide an overview of chewing gum as a delivery vehicle for dental-protective agents, highlighting xylitol and its potential application in caries-prevention programs for children. TYPES OF STUDIES REVIEWED The authors reviewed selected clinical investigations and previous reviews associated with chewing gum containing substances such as calcium, bicarbonate, carbamide...

Journal: :World journal of orthodontics 2009
Ayca Ustdal Tancan Uysal Gulsen Akdogan Gokmen Kurt

OBJECTIVE To determine the effect of 16% carbamide peroxide on the shear bond strength of metal brackets bonded to premolars either immediately or 30 days after bleaching and to evaluate the bond-failure sites. MATERIAL AND METHOD Sixty freshly extracted human premolars were randomly divided into three groups, each containing 20 teeth. Specimens in group A (control) were not bleached (etched ...

Journal: :The journal of contemporary dental practice 2008
Soodabeh Kimyai Hadi Valizadeh

AIM The aim of this study was to compare the effects of solution and different sodium ascorbate hydrogels on dentin-resin composite shear bond strength subsequent to a bleaching procedure with 10% carbamide peroxide. METHODS AND MATERIALS Sixty buccal dentin surfaces obtained from intact human third molars were randomly divided into five groups (n=12). Dentin surfaces received different treat...

2009
Carina Sinclér Delfino Michelle Alexandra Chinelatti Laíse Daniela Carrasco-Guerisoli Andrigo Reis Batista Izabel Cristina Fröner Regina Guenka Palma-Dibb

OBJECTIVES This study evaluated the effectiveness of different home bleaching agents on color alteration and their influence on surface and subsurface microhardness of discolored bovine enamel. MATERIAL AND METHODS Forty-five fragments of bovine incisors were randomly allocated into 3 groups (n=15) according to the bleaching agent: 10% carbamide peroxide gel (CP10), 16% carbamide peroxide gel...

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