If turned upside down there would be a tendency for the water to rise to the highest points, causing faulty cusp tips on the model. The tray should be placed with the teeth down. Thick mix of plaster or stone can entrap air bubbles. Undermixing - Inadequate wetting, lacking homogeneity and poor detail reproductionĬasts should be poured using vacuum mixed stone and a vibrator.Overmixing - Reduction in final strength and working time.What are the mixing times for alginate impression materials?Ĭare should be taken to not overmix or undermix the material as it may result in the following undesirable outcomes: What are the different types of dental alginate?īased on the setting time alginate impression materials can be classified as: Studies show that alginate can be used as a final impression material for indirect restorations, that have chamfer preparation margins. They are also used extensively for making impressions to fabricate orthodontic models, sports mouth guards, bleaching trays and many more. Alginate impression materials can be used to make preliminary impressions for provisional crown and bridge restorations, study models and impressions off the opposing dentition. Alginate has been the staple of most dental offices in the world. They are simple, cost-effective and with command over the working of the material, the dentist gets the impression right the first time. Alginates are elastic, irreversible hydrocolloid materials that form an inseparable part of indirect restorations in dentistry. Alginate is a peculiar extract yielded by certain brown seaweed or algae. The word alginate is derived from term ‘Algin’, coined by a chemist during the end of the 19 th century. Alginate impression materials are widely used in dentistry. A universally used impression material, to make preliminary impression of the dental arches is the irreversible hydrocolloid, Alginate. It also depends on the type of dental treatment. Dentists use various impression materials for different stages of treatment. Impression materials are an essential part of the inventory in a dental office.
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