نتایج جستجو برای: enamel bleaching

تعداد نتایج: 16293  

2014
Sedighe Sadat Hashemi Kamangar Maryam Ghavam Nazanin Mahinfar Seyed Jalal Pourhashemi

OBJECTIVES This study aimed to assess the effect of 38% carbamide peroxide on the microleakage of class V cavities restored with either a silorane-based composite or two methacrylate-based composites. MATERIALS AND METHODS A total of 96 class V cavities were prepared on the buccal surface of extracted human teeth with both enamel and dentin margins and were randomly assigned into three groups...

2009
maha ahmed Niazy el-sayed salama Maha Ahmed Niazy

In complex cases of enamel fluorosis or enamel dys-mineralization, combined bleaching and micro-abrasion therapies may be advocated. The aim of the present study was to investigate the effect of combined in-office bleaching and micro-abrasion on the bond strength of two dental adhesives bonded to surface enamel. The interfacial micro-morphology of the involved surfaces was also studied by using...

2015
Rafael Francisco Lia Mondelli Taisa R. Conti Garrido Gabriel Fabio Antonio Piola Rizzante Ana Carolina Magalhães Juliana Fraga Soares Bombonatti Sérgio Kiyoshi Ishikiriama

OBJECTIVE Tooth bleaching tends to increase enamel roughness and porosity, in addition to reducing surface microhardness. The aim of this in vitro study was to evaluate the effects of bleaching treatments using different hydrogen peroxide (HP) concentrations, with and without light activation on bovine enamel microhardness. MATERIALS AND METHODS The buccal surfaces of sixty bovine incisors we...

Journal: :Journal of dentistry 2005
Neslihan Efeoglu David Wood Candan Efeoglu

OBJECTIVES There is still some controversy in the dental literature whether carbamide peroxide bleaching causes demineralization of teeth. One of the reasons for this controversy is that there is as yet no reliable, non-destructive in vitro method for assessing mineral loss in bleached teeth. The objective of this study was to investigate the possible demineralization effect of 10% carbamide pe...

Journal: :Brazilian oral research 2013
Leily Macedo Firoozmand Juliana Viana Pereira Brandão Melissa Proença Nogueira Fialho

The aim of this study was to evaluate the shear bond strength (SBS) of polycrystalline ceramic brackets (PCB) bonded after bleaching treatment using different composite resins and enamel etching times. A total of 144 bovine incisors were randomly divided into two study groups (n = 72, each) as follows: G1, enamel bleached with 35% hydrogen peroxide, and G2 (control group), enamel unbleached. Af...

Journal: :Medicina oral, patologia oral y cirugia bucal 2008
Ulvi Kahraman Gursoy Digdem Isin Eren Ozden Ozel Bektas Feridun Hurmuzlu Vildan Bostanci Hakan Ozdemir

OBJECTIVES Treatment of dental discolorations with external bleaching is becoming very common in dentistry, however, possible irreversible alterations on enamel surface due to bleaching procedures is a topic of discussion. The aim of this study was to evaluate the clinical effects of bleaching by measuring the dental plaque accumulation on human enamel and tooth discoloration in vivo. STUDY D...

2016
Zahra Khamverdi Parvin Khadem Aliraza Soltanian Maryam Azizi

OBJECTIVES A reduction in bond strength of composite to bleached enamel has been reported immediately after bleaching treatment. Application of some antioxidant agents may decrease the adverse effects of whitening agents on bond strength and enhance composite bond to enamel. This study aimed to assess the effect of green tea, sodium ascorbate, sage and grape seed extract on bond strength of com...

2016
Tae-Young Park Han-Sol Choi Hee-Won Ku Hyun-Su Kim Yoo-Jin Lee Jeong-Bum Min

Enamel microabrasion has become accepted as a conservative, nonrestorative method of removing intrinsic and superficial dysmineralization defects from dental fluorosis, restoring esthetics with minimal loss of enamel. However, it can be difficult to determine if restoration is necessary in dental fluorosis, because the lesion depth is often not easily recognized. This case report presents a met...

Journal: :Dental materials journal 2007
Maki Oshiro Hiroyasu Kurokawa Susumu Ando Atsushi Irokawa Masashi Miyazaki Jeffrey A Platt

The purpose of this study was to determine the elastic modulus of enamel during bleaching procedure with the use of an ultrasonic device. Enamel sections were obtained from freshly extracted bovine incisors. Specimens were exposed to 10% carbamide peroxide for two hours, followed by an application of a fluoride-containing toothpaste for five minutes and stored in artificial saliva (pH 7.0). An ...

Journal: :Indian journal of dental research : official publication of Indian Society for Dental Research 2009
Rodrigo A Dutra Jose R T Branco Hugo H Alvim Luiz T A Poletto Rodrigo C Albuquerque

OBJECTIVES The objective of the present study was to analyze the superficial roughness and the interface between enamel and composite resin restorations after dental bleaching procedure. MATERIALS AND METHODS Black's class V cavities were made and restored with composite resin, and the whole set, enamel-restorative material, was treated with 35% hydrogen peroxide. Seven procedures of 30 min e...

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