This second reaction occurs in preference to the first reaction until the trisodium phosphate is used up, and then alginate sets as a gel. Trisodium phosphate reacts with calcium sulfate to produce calcium phosphate, preventing calcium sulfate from reacting with sodium alginate to form a gel. Hence it is slowed down by the addition of trisodium phosphate to the powder. This reaction occurs too quickly often during mixing or loading of the impression tray. Here, sodium alginate reacts with calcium sulfate, resulting in sodium sulfate and calcium alginate. On mixing the powder with water, a sol is formed, a chemical reaction takes place, and a gel is formed. The powder contains sodium alginate, calcium sulfate, trisodium phosphate, diatomaceous earth, zinc oxide, and potassium titanium fluoride. A study has shown that alginate impressions can be used as final impressions for indirect restorations when the preparation margins are chamfer. Alginates are used for impressions in orthodontic models, sports mouth guards, and bleaching trays and more. Irreversible hydrocolloid can be used in preliminary impressions, provisional crown-and-bridge impressions, study models, opposing dentition impressions. The purpose of this article is to provide clinical do's and don'ts while using alginate material for impressions. They form a major bulk of our clinical practice even today therefore, it becomes mandatory to understand the material and follow certain fundamental guidelines for flawless, predictable impressions and hence avoid repeat impression/restorations. For many years, alginate impression material has been a staple of most dental practices. Yet very few people can make alginate impressions just right the first time. Alginate is one of the most frequently used dental materials and alginate impression is a simple, cost-effective, and indispensable part of dental practice. Irreversible hydrocolloid impressions form an inseparable part of indirect restorations. Available from: Īlginate is an elastic, irreversible hydrocolloid impression material. Alginate impressions: A practical perspective.
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How to cite this URL: Nandini V V, Venkatesh K V, Nair K C. How to cite this article: Nandini V V, Venkatesh K V, Nair K C. Keywords: Alginate impressions irreversible hydrocolloid.
This article gives a detailed perspective of how best to make alginate impressions. Even with the introduction of more advanced and more accurate rubber base impression materials, irreversible hydrocolloid impression materials have stood the test of time. The choice of an impression material for a particular situation depends on the treatment being provided, operator preference, and so on. V Vidyashree Nandini 1, K Vijay Venkatesh 2, K Chandrasekharan Nair 1ġ Department of Prosthodontics & Implantology, Meenakshi Ammal Dental College,Chennai, India 2 Department of Conservative Dentistry & Endodontics, Meenakshi Ammal Dental College, Chennai, IndiaĬlick here for correspondence address and email Date of Submission Alginate impressions: A practical perspective
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