نتایج جستجو برای: phosphate based glass

تعداد نتایج: 3083728  

B. Eftekhari Yekta, G. Maghouli,

Commercial dental lithium disilicate based glass-ceramics containing various amounts of P2O5 were synthesized. Regarding the crystallization behavior and physico-chemical properties of the glasses, the optimum percent of P2O5 was determined.as 8 %wt. Crystallization behavior of the glasses was investigated by X-ray diffraction (XRD) and differential thermal analysis (DTA). The micro-hardness a...

Journal: :Journal of materials science. Materials in medicine 2015
J Massera A Kokkari T Närhi L Hupa

In this paper, we investigate the effect of substituting SrO for CaO in silicate and phosphate bioactive glasses on the human gingival fibroblast activity. In both materials the presence of SrO led to the formation of a CaP layer with partial Sr substitution for Ca. The layer at the surface of the silicate glass consisted of HAP whereas at the phosphate glasses it was close to the DCPD composit...

Journal: :journal of dentistry, tehran university of medical sciences 0
h. hajmiragha associate professor, department of prosthodontics, school of dentistry, tehran university of medical s. nokar associate professor, department of prosthodontics, school of dentistry, tehran university of medical m. alikhasi assistant professor, department of prosthodontics, school of dentistry, tehran university of medical s. nikzad assistant professor, department of prosthodontics, school of dentistry, tehran university of medical h. dorriz assistant professor, department of prosthodontics, school of dentistry, tehran university of medical

objective: the purpose of this study was to evaluate the solubility of three luting cements in artificial saliva. materials and methods: twenty disks (10×4 mm) of polycarboxylate, zinc phosphate and glass ionomer cements were prepared according to manufactures’ instructions. after setting, they were desiccated and each ten specimens were immersed in artificial saliva with special ph (3 or 5), c...

2008
A E Marino

Phosphate glasses have special applications, but tra,ditionally never have had both durability and a low glass transition temperature (making them hard to work with). A composition study was used to find a more durable, easily fabricated phosphate glass with a low glass transition temperature. Batching, melting, casting, annealing and fabrication of test parts were performed. Glasses were chara...

Journal: :Acta biomaterialia 2012
Azadeh Kiani John V Hanna Scott P King Gregory J Rees Mark E Smith Nima Roohpour Vehid Salih Jonathan C Knowles

Phosphate-based glasses have been investigated for tissue engineering applications. This study details the properties and structural characterization of titanium ultra-phosphate glasses in the 55(P(2)O(5))-30(CaO)-(25-x)(Na(2)O)-x(TiO(2)) (0≤x≤5) system, which have been prepared via melt-quenching techniques. Structural characterization was achieved by a combination of X-ray diffraction (XRD), ...

Journal: :dental research journal 0
meenal nitin gulve nitin dilip gulve

background: scuba diving is one of the fastest growing sports in the world. the objective of this study was to evaluate the effect of pressure variations to which divers are exposed on the pull out strength of glass fiber post luted with different cements. materials and methods: in this in vitro study, 120 extracted, single-rooted lower premolars were endodontically treated. they were randomly ...

Journal: :Biomedical materials 2015
R Colquhoun K E Tanner

Biodegradable materials are potentially an advantageous alternative to the traditional metallic fracture fixation devices used in the reconstruction of bone tissue defects. This is due to the occurrence of stress shielding in the surrounding bone tissue that arises from the absence of mechanical stimulus to the regenerating bone due to the mismatch between the elastic modulus of bone and the me...

Journal: :Chemical & pharmaceutical bulletin 2013
Toru Ogawa Makoto Miyajima Naoki Wakiyama Katsuhide Terada

The characteristics of inorganic particles generated in glass vials filled with phosphate buffer solutions were investigated. During storage, particles were visually detected in the phosphate buffer solution in particular glass vials which pass compendial tests of containers for injectable drugs. These particles were considered to be different from ordinal glass delamination, which has been rep...

2012
Martin Waselau Mimmi Patrikoski Miia Juntunen Kasperi Kujala Minna Kääriäinen Hannu Kuokkanen George K Sándor Outi Vapaavuori Riitta Suuronen Bettina Mannerström Brigitte von Rechenberg Susanna Miettinen

The effects of bioactive glass S53P4 or beta-tricalcium phosphate; and bone morphogenetic proteins bone morphogenetic protein-2, bone morphogenetic protein-7, or bone morphogenetic protein-2 + 7 on osteogenic differentiation of human adipose stem cells were compared in control medium, osteogenic medium, and bone morphogenetic protein-supplemented osteogenic medium to assess suitability for bone...

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