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. 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. Also, if the ideal procedure is not followed, it will lead to a compromised fit of the final prosthesis and failure of the treatment.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. Conclusion: The ideal materials, technique, and armamentarium are required for the long-term success of the treatment for fixed dental prosthesis. ![]() Most of the participants used addition silicone with single mix heavy body with light body technique for making final impression and some of them used polyether. Maximum participants used hemostat along with retraction cord. ![]() 80% of them used retraction cord for gingival retraction and only few of them used elecrosurgery, lasers, rotary curettage and gingifoam. Results: Results shows that, majority of responses indicated use of irreversible hydrocolloid in stock metal tray for making the preliminary impression. Data were analyzed by using SPSS 19 software. A self-administered anonymous questionnaire was distributed to the participants. Ethical approval for the beginning of the study was obtained via Institutional Review Committee, Ibn Sina National College for Medical studies, Jeddah. ![]() Material and methods: A questionnaire based survey was conducted among the dental practitioners of Makkah region of Saudi Arabia. The aim of this survey was to integrate impression techniques evolved all over the years for fixed partial dentures and to know the techniques and materials which are used in the present day by the practitioners.
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