نتایج جستجو برای: gypsum block

تعداد نتایج: 162098  

Journal: :Journal of colloid and interface science 2011
Nancy H Lin Wen-Yi Shih Eric Lyster Yoram Cohen

Surface crystallization of calcium sulfate dihydrate (gypsum) on a series of polymeric surfaces was studied using a quartz microbalance system. Polyelectrolyte multilayer films (positively and negatively charged surfaces) were formed on the quartz crystal microbalance (QCM) sensors utilizing a layer-by-layer spin-assembly method. The kinetics of gypsum surface crystallization was quantified in ...

Journal: :The journal of physical chemistry. A 2008
Alejandro Fernández-Martínez Gabriel J Cuello Mark R Johnson Fabrizio Bardelli Gabriela Román-Ross Laurent Charlet Xavier Turrillas

The ability of gypsum, a common sulfate mineral, to host arsenic atoms in its crystalline structure, is demonstrated through experimental structural studies of the solid solutions formed upon synthetic coprecipitation of gypsum (CaSO4 x 2 H2O) and arsenic. Neutron and X-ray diffraction methods show an enlargement of the gypsum unit cell proportional to the concentration of arsenic in the solids...

2015
Yeliz Arslan Seçil Karakoca Nemli Merve Bankoğlu Güngör Evşen Tamam Handan Yılmaz

PURPOSE The aim of this study was to evaluate occlusal contacts generated by 3 different biogeneric design modes (individual (BI), copy (BC), reference (BR)) of CEREC software and to assess the designs subjectively. MATERIALS AND METHODS Ten pairs of maxillary and mandibular casts were obtained from full dentate individuals. Gypsum cast contacts were quantified with articulating paper and dig...

Journal: :Brazilian oral research 2012
Stéfani Becker Rodrigues Carolina Rocha Augusto Vicente Castelo Branco Leitune Susana Maria Werner Samuel Fabrício Mezzomo Collares

The aim of this study was to evaluate the physical properties of irreversible hydrocolloid materials poured immediately and after different storage periods. Four alginates were tested: Color Change (Cavex); Hydrogum (Zhermack); Hydrogum 5 (Zhermack); and Hydro Print Premium (Coltene). Their physical properties, including the recovery from deformation (n = 3), compressive strength (n = 3), and d...

2017
Connor Brolly John Parnell Stephen Bowden

Impact craters and associated hydrothermal systems are regarded as sites within which life could originateonEarth,andonMars.TheHaughton impactcrater,oneof themostwell preservedcratersonEarth, is abundant inCa-sulphates. Selenite, a transparent form of gypsum, has been colonized by viable cyanobacteria. Basementrocks,whichhavebeenshocked,aremoreabundant inendolithicorganisms,whencomparedwithunsh...

2016
Stephania Caroline Rodolfo Silva Aion Mangino Messias Filipe de Oliveira Abi-Rached Raphael Freitas de Souza José Maurício dos Santos Nunes Reis

This study evaluated the accuracy of gypsum casts after different impression techniques and double pouring. Ten patients were selected and for each one it was obtained 5 partial putty/wash impressions with vinyl polysiloxane (VPS) material from teeth #13 to #16 with partial metal stock trays. The following techniques were performed: (1) one-step; two-step relief with: (2) PVC film; (3) slow-spe...

2015
Susana Serrano Camila Barreneche Antonia Navarro Laia Haurie A. Inés Fernandez Luisa F. Cabeza

Gypsum has two important states (fresh and hardened states), and the addition of phase change materials (PCM) can vary the properties of the material. Many authors have extensively studied properties in the hardened state; however, the variation of fresh state properties due to the addition of Micronal® DS 5001 X PCM into gypsum has been the object of few investigations. Properties in fresh sta...

Journal: :Brazilian oral research 2016
Lorena Oliveira Pedroche Sérgio Rocha Bernardes Moira Pedroso Leão Cibele Cândida de Almeida Kintopp Gisele Maria Correr Bárbara Pick Ornaghi Carla Castiglia Gonzaga

The objective of this study was to evaluate the marginal and internal fit of zirconia copings obtained with different digital scanning methods. A human mandibular first molar was set in a typodont with its adjacent and antagonist teeth and prepared for an all-ceramic crown. Digital impressions were made using an intraoral scanner (3Shape). Polyvinyl siloxane impressions and Type IV gypsum model...

Journal: :Analytical chemistry 2008
Megan Rohrssen Benjamin Brunner Randall E Mielke Max Coleman

The isotopic composition of water in hydrated minerals, such as gypsum and jarosite, has numerous applications in studies of recent climate change, ore formation, and soil development. However, oxygen and hydrogen isotope analysis of water of crystallization is currently a complex procedure. Commonly used techniques involve offline extraction of water from hydrated minerals and subsequent isoto...

Journal: :journal of agricultural science and technology 2010
a. keyhani

to measure soil water content (or soil matric suction) in thin layers of about 30mm, conventional gypsum blocks are not suitable. to carry out the task, mini-gypsum blocks were constructed using plaster of paris in an innovative fashion. a power relationship was found between the soil water content and the mini-gypsum blocks’ readings in kω. the calibration results showed that readings of m...

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