Ultrastructure study of hydroxyapatite precipitation on ceramic surfaces in dog model

2008 ◽  
Vol 28 (8) ◽  
pp. 1255-1259 ◽  
Author(s):  
Renlong Xin ◽  
Yang Leng ◽  
Ning Wang
Author(s):  
H.-J. Ou

The understanding of the interactions between the small metallic particles and ceramic surfaces has been studied by many catalyst scientists. We had developed Scanning Reflection Electron Microscopy technique to study surface structure of MgO hulk cleaved surface and the interaction with the small particle of metals. Resolutions of 10Å has shown the periodic array of surface atomic steps on MgO. The SREM observation of the interaction between the metallic particles and the surface may provide a new perspective on such processes.


1986 ◽  
Vol 71 (6) ◽  
pp. 749-753 ◽  
Author(s):  
J. E. Maddison ◽  
D. Yau ◽  
P. Stewart ◽  
G. C. Farrell

1. Cerebrospinal fluid (CSF) γ-aminobutyric acid (GABA) levels were measured in a dog model of spontaneous chronic portosystemic encephalopathy. 2. Dogs with congenital portacaval shunts (intra- or extra-hepatic) develop neurological features of abnormal psychomotor behaviour and depressed consciousness that are consistent with the symptoms of chronic portosystemic encephalopathy in humans. In the five dogs studied, plasma ammonia was elevated, as was CSF tryptophan, both usual biochemical abnormalities in portosystemic encephalopathy. 3. CSF levels of GABA in five dogs with portosystemic encephalopathy (100 ± 13 pmol/ml) were not significantly different from those in five control dogs (96 ± 14 pmol/ml). CSF levels of GABA were not altered after ammonia infusion. 4. If enhanced GABA-ergic neurotransmission, due to influx of gut-derived GABA into the brain, is responsible for the pathophysiology of chronic portosystemic encephalopathy in this model, it is not reflected by increased levels of GABA in CSF.


2021 ◽  
Vol 31 (1) ◽  
pp. 56-68
Author(s):  
Fredrik S. Skedsmo ◽  
Arild Espenes ◽  
Michael A. Tranulis ◽  
Kaspar Matiasek ◽  
Gjermund Gunnes ◽  
...  

2021 ◽  
Vol 11 (6) ◽  
pp. 2512
Author(s):  
Anca Labunet ◽  
Andreea Kui ◽  
Sorina Sava

Orthodontists must sometimes bond attachments to ceramic crowns, by using one of the surface preparations available, such as sandblasting or acid etching with hydrofluoric acid. Research shows that different laser systems may also be used for this purpose. The aim of this review is to determine which laser type and modality of use is the most effective in increasing shear bond strength of brackets bonded to ceramic surfaces. Two independent researchers studied the current literature 1990–2018 and selected original articles focusing on in vitro research on laser use for ceramic surface preparation for bonding metallic or ceramic attachments. Twelve articles have met the criteria and have been thoroughly revised, focusing on 2 fractional, Nd:Yag, Er:Yag, femtosecond and Ti:Sapphire lasers. There is little difference shown by the current studies between ceramic types and information on orthodontic bonding to non-feldspathic ceramics is scarce. Femtosecond laser is a good alternative to classical surface preparation with hydrofluoric acid. Nd:Yag laser is more suitable for surface preparation of ceramics than different types of Er:Yag lasers. Difference in laser power may achieve different results, but the golden standard for lasers use has not been found. Laser usage does not obtain the same results as hydrofluoric acid and cannot, so far, eliminate its application.


2004 ◽  
Vol 77 (6) ◽  
pp. 2177-2181 ◽  
Author(s):  
Yves Van Belleghem ◽  
Ramses G Forsyth ◽  
Kishan Narine ◽  
Annelies Moerman ◽  
Yves Taeymans ◽  
...  
Keyword(s):  

2014 ◽  
Vol 46 (3) ◽  
pp. 170-177 ◽  
Author(s):  
Adel M. Hussein ◽  
Hamid A. Saleh ◽  
Mustafa H.N.

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