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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.
If a temporary crown becomes de-cemented, it is important that a dentist examine the patient as overeruption of the opposing teeth may prevent accurate fitting of the final crown. [8] If a dentist cannot be seen in a timely manner, the temporary crown may be re-cemented by applying temporary cement to the temporary crown.
Zinc phosphate cement is used for cementation of inlays, crowns, bridges, and orthodontic appliances and occasionally as a temporary restoration. It is prepared by mixing zinc oxide (ZnO) and magnesium oxide (MgO) powders with a liquid consisting principally of phosphoric acid , water, and buffers .
Temporary crowns can either be direct, if constructed by the dentist in the clinic, or indirect if they are made off-site, usually in a dental laboratory. Generally direct temporary crowns tend to be for short-term use. Where medium-term or long-term temporisation is required, the use of indirect temporary crowns should be considered. [10]
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.
Dental cements are used most often to bond indirect restorations such as crowns to the natural tooth surface. Examples include: Examples include: Zinc oxide cement—self setting and hardens when in contact with saliva.