![]() ![]() Agar was first introduced into dentistry for recording crown impressions in 1937 by Sears and was the first elastic impression material available. It is fundamentally a hydrophilic, emulsoid polysaccharide. Inelastic impression materials include impression waxes, impression compound, impression plaster, and metallic oxide pastes.Īgar-agar is an organic colloid obtained from the cell wall of red seaweed. Elastic impression materials include the following: reversible hydrocolloid, irreversible hydrocolloid, polysulfide, polyether, addition silicone (polyvinyl siloxane ), condensation silicone, and vinyl polyether siloxane. Hence, conventional impression materials are of two subtypes: elastic and inelastic. Impression materials can be categorized on the basis of their composition, setting reaction, and setting properties, but a commonly used system is based on the properties after the material has set. Ĭlassification of Dental Impression Material A systematic knowledge of these concepts is essential if the clinicians are to produce accurate reproductions of oral structures. Along with this, all these materials have different indications and contraindications for use. Both physical and chemical properties of all the impression materials are different from each other. ![]() In today's modern field of dentistry, numerous impression materials are available. Dental impression materials in prosthodontics: An overview for the general dentist. How to cite this URL: Arqoub MA, Rabi T, Arandi NZ. How to cite this article: Arqoub MA, Rabi T, Arandi NZ. Keywords: Alginate, impression material, prosthodontics Hence, in the present review, we aim to highlight some of the important aspects of dental impression materials used in prosthodontics. The accuracy and dimensional stability of impression materials are of paramount importance to the accuracy of fit of the resultant prosthesis. Impression making is a routine procedure carried out at the start of any prosthodontic procedure. This way the practitioner knows exactly when the right time for each step of the process is.Dental impression creation is the procedure of formulating a negative replica of the teeth and oral tissues, into which different die materials can be processed to create working analogs. Some materials can change their color depending on the stage of the process (e.g. Setting time may vary between 1 and 3 minutes, depending on several factors : The 2 substances can be 2 paste substances, a paste and a liquid or a powder and a liquid (which may be water). Usually, impression materials are prepared by mixing 2 substances: the base substance and the catalyst. Not irritating or toxic to the oral tissues. Setting time : has to be short, but enough. That means the fidelity of the impression will be preserved until reaching the dental lab. ![]() Stability : the quality of the material to maintain its exact shape for a certain period of time. A proper impression material must have several qualities :įidelity : the ability of the impression material to record the finest details.Įlasticity : the property of the material to keep the fidelity of the impression when removed from the mouth. ![]()
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