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Some dentists will also finish root canal treatment by covering the exposed tooth with a crown. [1] A crown is typically bonded to the tooth by dental cement. They can be made from various materials, which are usually fabricated using indirect methods. Crowns are used to improve the strength or appearance of teeth and to halt deterioration.
This image taken from the Dental Cosmos shows a box of bottles containing dental cement which was used to lute dental crowns, bridges and inlays. It was produced by the L.D. Caulk Company in the early 1900s. A luting agent is a dental cement connecting the underlying tooth structure to a fixed prosthesis.
The crowns, and several of the veneers, now routinely pop off, forcing Reynoso to put them back in herself with denture glue. The entire ordeal—now, four years past—still haunts her.
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.
Once a correct size and fit is established, the crown may be adhered to the tooth. The stainless steel crown is secured to the tooth by partially filling the stainless steel crown with a self-curing glass ionomer cement and then placing over the tooth. [26] The stainless steel crown should "click" securely into place. [26]
Extracoronal preparations provide a core or base upon which restorative material will be placed to bring the tooth back into a functional and aesthetic structure. Examples include crowns and onlays, as well as veneers. In preparing a tooth for a restoration, a number of considerations will determine the type and extent of the preparation.