نتایج جستجو برای: abrasivity index

تعداد نتایج: 396129  

2013
Gunnar Johannsen Georg Tellefsen Annsofi Johannsen Anders Liljeborg

OBJECTIVE To evaluate the relative abrasivity of different toothpastes and polishing pastes both qualitatively and quantitatively. MATERIALS AND METHODS Acrylic plates were exposed to brushing in a brushing machine with a toothpaste/water slurry for 1 and 6 h. Twelve different toothpastes were used and also four different polishing pastes. The results were evaluated using a profilometer after...

2016
Mozhgan Bizhang Katharina Riemer Wolfgang H. Arnold Julia Domin Stefan Zimmer

AIM The aim of this study was to determine the influence of manual toothbrushes with different bristle stiffness on the abrasivity on eroded and sound human dentin. MATERIALS AND METHODS Dentin specimens were made from impacted third molars and attributed to three groups: erosion-abrasion (EA), abrasion (A) and erosion (E). The specimens from EA and E were treated with 1% citric acid (pH 2.3)...

2016
Kevin Caruana Adam J. White Nigel Bubb Paul A. Brunton

Objectives: To test the wear of enamel against Yttria Tetragonal Zirconia Polycrystals (Y-TZP) in comparison to the wear of enamel against a noble white high Palladium alloy. Methods: A total of 20 specimens were used, 10 of Y-TZP and 10 of High Palladium alloy, both were subjected to 202,800 contacts against an enamel rod 2x2 mm in cross section under a mean load of 475.04g leading to a mean f...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه فردوسی مشهد - دانشکده علوم پایه 1392

چکیده سایندگی از جمله خصوصیات مهم در پروژه های حفاری و تونلزنی در سنگها می باشد این پدیده، رفتاری از سنگها است که در مقابله با برش، توسط ابزار حفاری بوجود می آید و باعث سایش و خوردگی ابزار و قطعات ماشین های حفاری بخصوص tbm می گردد. این امر سبب افزایش هزینه های ناشی از تعویض و تعمیر این قطعات می گردد. در نتیجه باعث افزایش زمان و کاهش راندمان و عملکرد دستگاه و عملیات حفاری می شود. لذا در پر...

2016
SIMONA STOLERIU GALINA PANCU IRINA NICA SORIN ANDRIAN CLAUDIU TOPOLICEANU GIANINA IOVAN Grigore T. Popa

The aim of this study was to assess the effect of toothbrushing with toothpastes having different relative dentine abrasivity (RDA) and toothbrushes having different bristles hardness on different composite resins, compomers and traditional glassionomer cements by surface roughness evaluation. All the samples were evaluated regarding the surface roughness using roughness checker (Taylor Hobson-...

Journal: :Advances in Space Research 2021

The Martian moon Phobos is the target of upcoming JAXA Moons eXploration (MMX) mission. There are currently no known samples Phobos, so spacecraft hardware testing and scientific studies require regolith simulants. Here, we present two new simulants: Captured Asteroid-1 (PCA-1) Giant Impact (PGI-1). These simulants reflect hypotheses for Phobos’s formation, thus broad possibilities composition....

Journal: :Acta biomaterialia 2012
N Diomidis S Mischler N S More Manish Roy

Knee and hip joint replacement implants involve a sliding contact between the femoral component and the tibial or acetabular component immersed in body fluids, thus making the metallic parts susceptible to tribocorrosion. Micro-motions occur at points of fixation leading to debris and ion release by fretting corrosion. β-Titanium alloys are potential biomaterials for joint prostheses due to the...

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