نتایج جستجو برای: surface microhardness

تعداد نتایج: 637583  

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 dental school, shahid beheshti university of medical sciences 0
میترا طبری mitra tabari dental materials research center, dental school, babol university of medical sciences, babol-iranمرکز تحقیقات مواد دندانی، دانشکده دندانپزشکی، دانشگاه علوم پزشکی بابل همایون علاقه مند homayoun alaghemand dental materials research center, dental school, babol university of medical sciences, babol-iranمرکز تحقیقات مواد دندانی، دانشکده دندانپزشکی، دانشگاه علوم پزشکی بابل محمود ربیعی mahmoud rabiee mechanic school, babol universityدانشکده مکانیک، دانشگاه صنعتی بابل. ثریا خفری sorayya khefri dental materials research center, medical school, babol university of medical sciences, babol-iran، دانشکده پزشکی، دانشگاه علوم پزشکی بابل سید مسعود سید احدی massoud seyyed ahadi dental school, ardebil university of medical sciences, ardebil-iranدانشکده دندانپزشکی، دانشگاه علوم پزشکی اردبیل محمدرضا نیک پور mohammad-reza nikpour nanobiotechnology research center, babol universityمرکز تحقیقات نانوبیوتکنولوژی، دانشگاه صنعتی بابل.

objective: oral iron drops are recommended for children aged 6-24 months to prevent iron-deficiency anemia. however, their use is associated with the potential risk of erosion and microhardness reduction of primary teeth enamel due to their high acidity. it seems that the combination of silicone oil, nano-hydroxyapatite and chitosan powder may be able to improve the microhardness and surface st...

Introduction: Increased consumption of energy drinks has raised concerns about their effects on dental restorations. This study assessed the effects of two energy drinks on the surface microhardness of methacrylate and silorane-based composites after 1-week and 1-month periods. Materials & Methods: In this in-vitro study, 90 cubic samples were prepared from Filtek P90, Filtek Z250 and Filtek Z...

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...

2006
Helena Zaramella Vono Ribeiro José Eduardo de Oliveira Lima Bernardo Gonzalez Vono Maria Aparcida de Andrade Moreira Machado Salete Moura Bonifácio da Silva

PURPOSE The aim of the present study was to evaluate the alterations of surface microhardness and wear caused by the sodium bicarbonate jet on bovine enamel and the further remineralizing effect of artificial saliva. METHODS Fifteen enamel samples (4,0mm x 4,0mm) were used, which constituted the groups: no treatment (MI); treatment with sodium bicarbonate jet (MII and DI); treatment with sodi...

2016
Nuray Tuloglu Sule Bayrak Emine Sen Tunc Fusun Ozer

BACKGROUND This study aimed to investigate the effects of a fluoride varnish with added Casein Phosphopeptide-Amorphous Calcium Phosphate (CPP-ACP) treatments on acid resistance of primary teeth enamel. METHODS Enamel specimens obtained from 40 primary incisors (for surface microhardness testing) and 40 primary molars (for demineralization depth measurement) were randomly divided into four gr...

Ahmadian Babaki, Fatemeh , Daneshvar, Seyedeh Hediyeh, Moslemi, Masume, Zare, Mahdieh,

Introduction Use of fluoridated toothpaste is the easiest and most common form of applying fluoride. Fluoride absorption can increase tooth microhardness. This study aimed to investigate the changes of primary tooth enamel microhardness following application of KAM, BATH, and CREST pediatric toothpaste. Materials and Methods Microhardness of 45 sound primary molar teeth was measured before t...

2016
Soram Oh Hiran Perinpanayagam Yoon Lee Jae-Won Kum Yeon-Jee Yoo Sang-Min Lim Seok Woo Chang Won-Jun Shon Woocheol Lee Seung-Ho Baek Kee-Yeon Kum

OBJECTIVES To evaluate the effects of three acids on the microhardness of set mineral trioxide aggregate (MTA) and root dentin, and cytotoxicity on murine macrophage. MATERIALS AND METHODS OrthoMTA (BioMTA) was mixed and packed into the human root dentin blocks of 1.5 mm diameter and 5 mm height. Four groups, each of ten roots, were exposed to 10% citric acid (CA), 5% glycolic acid (GA), 17% ...

Journal: :dental research journal 0
noushin shokouhinejad hassan razmi mehrfam khoshkhounejad arezoo javani maryam raoof

background: this study was conducted to assess the effect of thickness and hydration condition on the surface microhardness of endosequence root repair material putty (errm; brasseler usa, savannah, ga), a premixed bioceramic material. materials and methods: polymethyl methacrylate cylindrical molds with an internal diameter of 4 mm and three heights of 2, 4, and 6 mm were fabricated. in group ...

2015
Zahra Bahrololoomi Malihe Lotfian

OBJECTIVES Laser irradiation has been suggested as an adjunct to traditional caries prevention methods. But little is known about the cariostatic effect of diode laser and most studies available are on permanent teeth.The purpose of the present study was to investigate the effect of diode laser irradiation combined with topical fluoride on enamel surface microhardness. MATERIALS AND METHODS F...

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