نتایج جستجو برای: dalma ceramics

تعداد نتایج: 15282  

2004
Alexander Karamanov Giuliana Taglieri

Iron-rich glass-ceramics were obtained by the sintering of two glass powders, labeled G1 and G2, at heating rates of 5° and 20°C/min followed by an isothermal step in the 850°–1050°C temperature interval. The sintering process was evaluated by the linear shrinkage; the closed porosity was estimated by density measurements; the structure and the morphology of the glass ceramics were observed by ...

2014
Kerem Yılmaz Fehmi Gonuldas Caner Ozturk

PURPOSE Surface color is one of the main criteria to obtain an ideal esthetic. Many factors such as the type of the material, surface specifications, number of firings, firing temperature and thickness of the porcelain are all important to provide an unchanged surface color in dental ceramics. The aim of this study was to evaluate the color changes in dental ceramics according to the material t...

2013
Hyun-Suk Cha Bin Yu Yong-Keun Lee

PURPOSE Perceived color of ceramics changes by the spectral power distribution of ambient light. This study aimed to quantify the amount of shifts in color and color coordinates of clinically simulated seven all-ceramics due to the switch of three ambient light sources using a human vision simulating spectroradiometer. MATERIALS AND METHODS CIE color coordinates, such as L*, a* and b*,of cera...

Journal: :Australian dental journal 2011
J R Kelly P Benetti

Dental ceramics are presented within a simplifying framework allowing for facile understanding of their development, composition and indications. Engineering assessments of clinical function are dealt with and literature is reviewed on the clinical behaviour of all-ceramic systems. Practical aspects are presented regarding the choice and use of dental ceramics to maximize aesthetics and durabil...

Journal: :journal of dentistry, tehran university of medical sciences 0
hossein bagheri tabassom hooshmand farzaneh aghajani

objectives: this study aimed to evaluate the effect of different ceramic surface treatments after machining grinding on the biaxial flexural strength (bfs) of machinable dental ceramics with different crystalline phases. materials and methods: disk-shape specimens (10mm in diameter and 1.3mm in thickness) of machinable ceramic cores (two silica-based and one zirconia-based ceramics) were prepar...

2001
R. G. Munro

The NIST Ceramics Division maintains two databases on the physical, mechanical, thermal, and other properties of high temperature superconductors and structural ceramics. Crystallographic data are featured prominently among the physical property data and serve several important functions in the classification and evaluation of the property values. The scope of materials, properties, and data ev...

2017
J. Camilo Roldán Tim Klünter Peter Schulz Ulrike Deisinger Claudius Diez Waltraud Waiss Christian Kirschneck Torsten E. Reichert Rainer Detsch

BACKGROUND The aim of the present study was to evaluate the degradation pattern of highly porous bioceramics as well as the bone formation in presence of bone morphogenetic protein 7 (BMP-7) in an ectopic site. METHODS Novel calcium phosphate ceramic cylinders sintered at 1,300°C with a total porosity of 92-94 vol%, 45 pores per inch, and sized 15 mm (Ø) × 5 mm were grafted on the musculus la...

Journal: :Journal of applied biomaterials & biomechanics : JABB 2010
Ponnusamy Kanchana Chinnathambi Sekar

PURPOSE Biphasic calcium phosphate (BCP) ceramics are suitable for synthetic bone applications. The strontium substituted calcium phosphate ceramics have potential for use in orthopedic surgeries. Aim of the present work is to introduce strontium into BCP (composed of hydroxyapatite and tricalcium phosphate) ceramics and to study their bioactivity and mechanical properties. METHODS BCP cerami...

2017
Shayan Abdollah Zadegan Aidin Abedi Seyed Behnam Jazayeri Hirbod Nasiri Bonaki Alexander R. Vaccaro Vafa Rahimi-Movaghar

STUDY DESIGN Narrative review. OBJECTIVES Anterior cervical discectomy and fusion (ACDF) is a reliable procedure, commonly used for cervical degenerative disc disease. For interbody fusions, autograft was the gold standard for decades; however, limited availability and donor site morbidities have led to a constant search for new materials. Clinically, it has been shown that calcium phosphate ...

2007
X. Miao Y. Hu J. Liu X. Huang

Since hydroxyapatite has excellent biocompatibility and bone bonding ability, porous hydroxyapatite ceramics have been intensively studied. However, porous hydroxyapatite bodies are mechanically weak and brittle, which makes shaping and implantation difficult. One way to solve this problem is to introduce a strong porous network onto which hydroxyapatite coating is applied. In this study, porou...

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