ZINC POLYCARBOXYLATE CEMENT EPUB!
Zinc polycarboxylate cement was the first cement to bond to tooth structure It consists of a powder containing zinc oxide and magnesium oxide, and a liquid. Shop for i-POL Zinc Polycarboxylate Cement at Premium Plus UK. Journal | Published: 22 January An anhydrous zinc polycarboxylate cement. P J Knibbs;, C G Plant; & D S Shovelton. British Dental Journal volume
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The possibility of strong bonds involving carboxylate groups from the poly acrylic acid was also suggested by results zinc polycarboxylate cement infrared spectroscopy to study the bonded surface .
The role of collagen in the tooth structure on the adhesion of glass-ionomers is unclear, though the finding that tensile bonds are stronger to enamel than to dentine suggests that the most important bonds are formed with the mineral phase of the tooth.
Based on these results, and also those of infrared spectroscopy, it has been suggested that bonding involves the hydroxyapatite phase of the tooth only, and that collagen has no role at all .
However, as collagen is a protein that contains both amino and carboxylic acid groups, the possibility of an interaction with carboxylate groups is high, so that at least some of the adhesion seems likely to be due to this . However, on balance, the evidence suggests that any bonds of this type are not particularly important zinc polycarboxylate cement the overall adhesion of glass-ionomers to the tooth .
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This technique is mild, and essentially acts to remove the smear layer and open the dentinal tubules. It also partially demineralizes the tooth surface, leading to an zinc polycarboxylate cement is surface area and exposure of micro-porosities in the surface, which allow micro-mechanical attachment and also hybrid-later formation .
These effects are not visible to the naked eye, but occur only on the microscopic level.
However, conditioning is essential to promote sound bonding by glass-ionomers. Studies using both transmission electron microscopy TEM and X-ray photo-electron spectroscopy XPS have shown that the poly acrylic acid used for conditioning is not completely removed by rinsing zinc polycarboxylate cement, but instead remains present as a thin layer up to 0.
This layer has been referred to as the gel phase . Adhesion of glass-ionomer cements appears to be the result of two inter-related phenomena.
This is caused by the formation of a shallow hybrid layer in which the hydroxyapatite-coated collagen fibrils at the tooth surface form a hybrid layer with the surface of the freshly placed glass-ionomer restoration.
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This suggests that glass-ionomers are effectively self-etching as a consequence of the presence of the polyacid component. This involves ionic bonds between the zinc polycarboxylate cement functional groups on the polyacid molecules and calcium ions in the hydroxyapatite surface .
Such bonding has zinc polycarboxylate cement observed experimentally on hydroxyapatite  and also on enamel and dentine  using XPS. However, some care is needed in interpreting these results.
XPS is zinc polycarboxylate cement high vacuum technique and consequently either the hydroxyapatite or the tooth surface was likely to have been more strongly desiccated in these experiments than they are under clinical conditions. In the longer term, there is a substantial change in the interface between a glass-ionomer cement and a restored tooth.
Polycarboxylate cement - an overview | ScienceDirect Topics
This appears to be the result of a diffusion process in which ions from zinc polycarboxylate cement cement and ions from the tooth surface travel into the interfacial zone to create an ion-exchange layer Fig.
This layer is clearly visible under the scanning electron microscope and is evidence of a chemical union between the tooth and the glass-ionomer cement.
The image shown in Fig. The interaction zone that resulted was not only a physically obvious structure, but analysis showed that it contained both strontium zinc polycarboxylate cement calcium.
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These ions originated, respectively, in the cement and the tooth surface, and obviously travelled zinc polycarboxylate cement each other to create the interfacial zone. These may predispose to life threatening conditions such as anaphylaxisoedema and cardiac arrhythmias. Eugenol is widely used in dentistry for different applications including impression pastes, periodontal dressings, cements, filling materials, endodontic sealers zinc polycarboxylate cement dry socket dressings.
Zinc oxide eugenol is a cement commonly used for provisional restorations and root canal obturation.