6/30/2023 0 Comments Agar dental impression materialThis has resulted in the development of two major classes of products-agents that occlude dentin tubules and desensitizing agents that interfere with the transmission of nerve impulses. The treatment and prevention of dentin hypersensitivity has focused on eliminating the ability of the causative agent to stimulate discomfort. The external stimulus is usually transitory, and the discomfort subsides shortly after the stimulus is removed. An external stimulus, such as a change in external temperature, air movement, or physical stimulus, can cause the patient discomfort. Then, an appropriate treatment plan to address the problem can be implemented.Īs a result of any number of factors, including abrasion or periodontal disease causing gingival recession, or erosion removing the surface of tooth enamel, the underlying dentin and dentin tubules can become exposed. The dental professional often needs to perform a thorough examination, as well as additional tests, to determine why the pain is occurring and to rule out other possible causes of the pain (periodontal disease, caries, etc). The cause and description of the pain reported by the patient can vary and is often not adequate to make a definitive diagnosis. The diagnosis of dentin hypersensitivity often poses a challenge for the dental professional. Alginates remain as an economical option and easily manipulated impression material.An effective treatment for dentin hypersensitivity. Agar-agar impression materials are no longer used in clinics because of the inconvenience of manipulation, whereas alginates are still popularly advocated. The use of agar-agar was not convenient as it required special equipment such as heaters, syringes, and water-cooled rim-lock trays. All impression materials with agar-agar component have a jelly-like substance which becomes soft when heated and hardens when cooled. 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. A systematic knowledge of these concepts is essential if the clinicians are to produce accurate reproductions of oral structures.Ĭlassification of Dental Impression Material 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. 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. Arandiĭental 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.
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