Make sure to consider why you're taking an impression before beginning each time. Step 1: Complete & Review Stone Model/Impression Submitting A Stone Model/Impression Case.We hope you liked it and don't miss our social networks where we tell you about the best news in the dental sector each week. This is the end of our article on dental plasters and casts! Remember that at Dentaltix we have a wide variety of dental casts available that are sure to perfectly meet your needs. Two top tips to keep in mind when proportioning is to follow the manufacturer's instructions and to be aware that variations in water/powder affect the strength or accuracy of the setting material. This proportion should be measured as indicated by the manufacturer in each case, but we are going to tell you what the recommended proportions are depending on the type of plaster!įirst, the powder should be weighed on a scale and the water should be measured with a graduated cylinder: Then pour the plaster in the highest area and finally fill in the plaster without going over the edge. Pouring technique: how is plaster prepared?, we'll tell you! First, the plaster must be vibrated to remove bubbles and improve the strength.What happens when the temperature is above 90º? There is no setting time because at such a high temperature the powder is dehydrated. Water temperature: low temperatures are synonymous with shorter setting time, while temperatures above 37º means longer setting time.Spatulate: the more spatulate, the higher the number of crystallisation nuclei and the shorter the setting time.What does this mean? Longer setting time. Water to plaster ratio: it is important to understand that the more water, the lower the number of crystallisation nuclei.⚠️What factors must be taken into account to mix the plaster correctly? Alpha 2 dental plaster: used when high precision and strength are required: prosthetic work and for orthodontic models.It is used for some restorations, study and diagnostic models. Alpha 1 dental plaster: characterised by its hardness and dimensional accuracy.It is used for plaster casts, model bases and set-ups. Beta dental plaster: known as white plaster, it is the least resistant but least expensive plaster.For this reason the type of plaster will influence the amount of water to be used when mixing each one. What are the differences between the types of dental casts? For example the size, shape and porosity of the calcium sulphate crystals. Dental plaster designations and applications: beta, alpha 1 and alpha 2 They are used to balance the crystallisation shrinkage of high melting alloys or shrinking materials. Must be abrasion resistant with minimal set expansion. The newest dental plaster! It has high compressive strength (more than type IV). The Type II dental plaster is the most commonly used in laboratories: Nowadays it is practically unusable because it is weak and porous. It is a compound of plaster of Paris (dry white powder) with some components used to regulate setting and expansion. Don't miss it! We will also show you examples of each of them. Now, let's tell you about the classification of dental plasters according to the ADA (American Dental Association), as the manufacturers of this material are guided by these regulations. To obtain dental casts or plasters, this material undergoes a calcination process at around 120✬ and is then mixed with water for its correct setting, obtaining a dehydrated calcium sulphate stone. Plaster is a mineral obtained from a natural reserve, a type of sedimentary rock composed of calcium phosphate formed in areas where sulphuric acid is in action on calcium minerals. Don't miss it because we're getting started! Looking for a complete overview of dental casts and plasters? Stay right here! In this article, we will tell you what these materials are used for, their classification, applications and very interesting facts that you're sure to find useful. Dental plasters are materials commonly used in dentistry, especially in the laboratory when creating models for prostheses or coatings for casts.
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