![]() The gelation times were determined according to Japanese Industrial Standards (JIS) T6505, and recovery from deformation, strain in compression and compressive strength were determined according to the International Organization for Standardization (ISO) specification 1563. The dynamic viscosity immediately after mixing was measured by means of a controlled-stress rheometer. Five powder-type alginate impression materials (Alginoplast EM, Aroma Fine, Algiace Z, Coe Alginate, Jeltrate Plus) and a paste-type alginate impression material (Tokuso AP-1) were used. This study examined physical properties and compatibility with dental stones of two types of alginate impression materials. Murata, H Kawamura, M Hamada, T Chimori, H Nikawa, H Physical properties and compatibility with dental stones of current alginate impression materials. Copyright American Academy of the History of Dentistry. The purpose of this article was to provide a comprehensive review about the historical development of impression dental materials. Futhermore, while continuous attempts are being made to enhance these materials, the ideal impression material has yet to be developed. Presently, the dental practitioner has access to a variety of impression materials and should be aware of their properties, indications and limitations as well. However, the introduction of elastomeric impression materials in the field of prosthodontics that offered the advantages of accuracy and dimensional stability substantially upgraded both the impression accuracy and the quality of the final restoration. During the 20th century, the advances in material development slowed significantly since the majority of the current impression materials had already been invented. The double (corrective) impression technique, along with the functional impression concept that was established after mid 1800s, are also identified as pivotal innovations. Beeswax represents the first impression material, while important bechmarks during the historical evolution of dental impression materials are considered to be the introduction of dental trays in the early 1800s and the invention of the gutta-percha, thermoplastic resins and plaster of Paris. To accomplish these goals, impression materials were essential. Dentists realized that the construction of a prosthetic restoration required both a detailed capture of the oral tissues along with stone cast fabrications. The concept of impression making process in dentistry began in the mid 1800s. Papadiochos, Ioannis Papadiochou, Sofia Emmanouil, Ioannis The Historical Evolution of Dental Impression Materials.
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