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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.
Crown to root ratio is the distance from the occlusal/incisal surface of the tooth to the alveolar crest in relation to the length of root within the bone. The minimum ratio of crown to root is considered to be 1:1, although the most favourable is a crown:root of 2:3. As the proportion of tooth supported by bone decreases, the lever effect ...
Some methods are quite similar and utilize either very similar or identical materials. Crowns may be made of gold or other similar metals, porcelain, or a combination of the two. Crowns made of Zirkonia Oxide are being made more popular due to their high translucency and durability as opposed to the chipping disadvantages of porcelain crowns.
[2] [3] [4] During initial development of implant retained teeth, all crowns were attached to the teeth with screws, but more recent advancements have allowed placement of crowns on the abutments with dental cement (akin to placing a crown on a tooth). This has created the potential for cement, that escapes from under the crown during ...
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]
If permanent restoration cannot be carried out immediately after tooth preparation, temporary restoration may be performed. The prepared tooth, ready for placement of restorative materials, is generally called a tooth preparation. Materials used may be gold, amalgam, dental composites, glass ionomer cement, or porcelain, among others.
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