Dental impressions show vital role for making teeth models, revealing oral tissue features.5 For producing an impression, a mixed impression material is ideally used appropriately by putting into tray and sealed by inserting into patient's mouth. A mixture of sodium, potassium or ammonium hydracids with alginate produces or converts it into a form of soluble salt.4Īn important feature of alginate is their use as impression material for prostheses and as dental impression material. The insoluble form of alginate is align or alginic acid. The biochemical structure of alginate is a 1, 4-linked B-D-mannuronic (M) and a-L-guluronic (G) acid residue. Substantial evidence persists on MgO playing an important role in chemical reaction resulting in pH rise during the settling process.2Īlginate, a biomaterial that makes it use for various biomedical purposes, occurs naturally as a polysaccharide which is extracted from brown algae also called as seaweeds like Laminaria hyperborean and lessonia.3 Their presence in seas is profound all over the globe. The use of magnesium oxide (MgO) is previously observed to act as cross-linker agent in dental alginates. The typical formulation of alginate includes sodium or potassium compound for ensuring good reproducibility of impression at interface with storage material. This can lead to compromised accuracy of impression, having adverse effect on clinical outcomes.1 The resulting process occurs simultaneously therefore, alginates can be regarded as especially susceptible to unpredictable distortion after immersion into liquids. This osmotic potential can be reversed when the water-soluble salts, which are present in the matrix of alginates, are eluted, leading to diffusing out of water, subsequently causing the material to shrink. Keywords: Dental Alginate, Impression material, Storage, Dimensional changesĪlginates are hydrophilic in nature and alterations in osmotic potential after immersing them in liquids cause them to absorb water, leading to swelling up. Byline: MUHAMMAD ANWAAR ALAM, MUSTAFA QADEER, FAREED AHMAD, FAIQUA YASSER, ALI ANWAAR AND PARS MUGHRBI
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