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After the prefabricated post is properly cemented into the post space, a core material, such as dental composite, can be packed around the cemented post. After the material has been cured or has had a chance to set and properly formed into a crown preparation, an impression can be taken for the fabrication of a prosthetic crown.
Using mathematical models and cast models, Dr. Ali Nankali was able to analyse, compare and categorise the structures in different ways which was a part of this study. Thus, the Nankali's post and core classification is based on designs, methods of production, retention/resistance systems and clinical indications.
The Nankali post system is a post and cores prosthesis, which is used in prosthodontology and dental restoration. This post and core consists of a single smooth or serrated post and core which has an additional circle ring (counter sink) around it.
In dentistry, a crown or a dental cap is a type of dental restoration that completely caps or encircles a tooth or dental implant. A crown may be needed when a large dental cavity threatens the health of a tooth. Some dentists will also finish root canal treatment by covering the exposed tooth with a crown.
Earlier versions of dental amalgams, known as 'conventional' amalgams consisted of at least 65 wt% silver, 29 wt% tin, and less than 6 wt% copper. [12] Improvements in the understanding of the structure of amalgam post-1986 gave rise to copper-enriched amalgam alloys, which contain between 12 wt% and 30 wt% copper and at least 40 wt% silver. [12]
The material is also suitable for cementing prefabricated or cast metal post-cores. [27] It can also be used to lute long span bridges. [1] The use of zinc phosphate in luting a porcelain crown may result in decreased aesthetic properties due to the high concentrations of unreacted zinc oxide, especially if the cement lute margin is visible.
A dental impression is a negative imprint of hard and soft tissues in the mouth from which a positive reproduction, such as a cast or model, can be formed. It is made by placing an appropriate material in a dental impression tray which is designed to roughly fit over the dental arches.
Zinc phosphate was the very first dental cement to appear on the dental marketplace and is seen as the “standard” for other dental cements to be compared to. The many uses of this cement include permanent cementation of crowns, orthodontic appliances, intraoral splints, inlays, post systems, and fixed partial dentures.
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