نتایج جستجو برای: Castable

تعداد نتایج: 168  

Journal: :Acta odontologica latinoamericana : AOL 2009
João L Bondan Hugo M S Oshima Regênio M H Segundo Rosemary S A Shinkai Eduardo G Mota Kléber R M Meyer

This study evaluated the fit between implants and premachined and castable UCLA abutments. All plastic specimens were cast using the conventional technique in accordance with the manufacturer's instructions. Five specimens of each experimental group were measured for vertical and horizontal gaps by scanning electronic microscopy (Phillips XL 30 model, Holland). Gold UCLA (vertical gap: 2.15 mic...

Journal: :international journal of iron & steel society of iran 2008
m. paghandeh a. monshi r. emadi

a basic alumina-spinel low cement castable (lcc) composed of sintered bauxite, reactive alumina, calcined alumina, calcined magnesia, microsilica, and high alumina refractory cement was prepared (castable a) to which 5% sodium hexa-meta phosphate was later added (castable b) to prepare samples for heat treatment at 110ºc, 900ºc, and 1400ºc. bulk density (bd), apparent porosity (ap), and cold cr...

2010
Sanja Martinović Jelena Majstrović Velislav Vidojković Tatjana Volkov-Husović

The low cement high alumina castable (LCC) studied in this paper was synthesised, cured and then treated at different sintering temperatures. Since any inhomogeneity introduced during the castable preparation can remain inside the material degrading its properties and therefore the quality during service life, particular attention was given to the processing procedure in order to produce the ma...

Journal: :Dental materials journal 1998
S Ukon M Fujita M Hayakawa A Takami M Ikeura Y Fukaura T Ogata

This study was carried out to determine the design and thickness of the cervical margin of a castable ceramic restoration from the point of view of its castability. Castability of castable ceramics was lower compared to Ag-Pd-Au and Co-Cr alloy with the use of the mesh pattern and rod pattern test (p < 0.05). It was more dependent on the pattern thickness than alloys (p < 0.05), and perfect rep...

A. Monshi M. Paghandeh R. Emadi,

A basic alumina-spinel low cement castable (LCC) composed of sintered bauxite, reactive alumina, calcined alumina, calcined magnesia, microsilica, and high alumina refractory cement was prepared (castable A) to which 5% sodium hexa-meta phosphate was later added (castable B) to prepare samples for heat treatment at 110ºC, 900ºC, and 1400ºC. Bulk Density (BD), Apparent Porosity (AP), and Cold Cr...

Journal: :Comput. Geom. 1994
David Rappaport Arnold Rosenbloom

This paper introduces the concepts of Moldability and Castability of simple polygons and relates Moldability to Monotonicity. We detail a (n) algorithm for determining all n forward maximal monotone chains of a simple polygon and apply this algorithm to the problems of determining 2-Moldability, 2-Castability and the minimum monotone decomposition of a simple polygon 9]. Our results include a s...

Journal: :Ceramics 2022

This article analyzes the mechanism of protective layer formation under action alkali in a refractory castable when ground quartz sand (GQS) is used as an admixture to produce conventional castables (CC) and medium cement (MCC). It was found that, independently composition, addition GQS (2.5%) reduces degree K2CO3 dissolution at high temperature, released potassium reacts with silica forms visc...

Journal: :Nihon Hotetsu Shika Gakkai Zasshi 1988

2016
Amir Ali Reza Khaledi Soheil Pardis Negar Pourhatami Zahra Hashemi Ardakani

OBJECTIVES This study aimed to compare the dimensional accuracy of two indexing materials, an acrylic resin (GC pattern resin) and a castable composite (Bredent). The effect of time lapse until investment was also investigated. MATERIALS AND METHODS Two standardized brass dies 15 mm apart were prepared and then 20 identical coping-bar assemblies were designed and fabricated by a rapid prototy...

Journal: :Brazilian dental journal 2007
Gustavo Augusto Seabra Barbosa Paulo Cézar Simamoto Júnior Alfredo Júlio Fernandes Neto Maria da Glória Chiarello de Mattos Flávio Domingues das Neves

An inadequate fit at the abutment/implant interface can generate mechanical and biological problems. The laboratorial stages could induce misfit in such interface when the castable UCLA abutment type is used. The purpose of this study was to comparatively evaluate the performance of three prosthetic laboratories (Labs A, B and C) by vertical fit analysis of castable UCLA abutments on the castin...

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