Dental crowns are cemented inside the oral cavity with the help of dental cement and cap the entire visible portion of the tooth.
Dental cement, also known as dental glue, is used in various other dental procedures such as attachment of braces to the teeth. (1)
Dental crowns are used to replace a lost part of the tooth due to caries or fracture of the tooth and help us to restore our beautiful smile. A crown is also helpful in improving your bite making your teeth to chew better.
Let us see more about dental cement, its types, etc.
What is a Dental glue or dental cement?
Dental cement is group materials that have a wide range of application in dentistry. Common uses of dental cement include insulation and cementing of fixed prosthodontic appliances such as a crown or dental bridge, cavity linings to provide pulpal protection, and temporary restoration of teeth. (2)
Dental cement is used for cementing the dental crowns and bridges to hold them in place. It is also used to protect a damaged tooth from breaking or to stick the parts of a cracked tooth.
Dental cement also plays a significant role in orthodontic treatment. Direct and indirect bonding of orthodontic brackets to the teeth is accomplished primarily with the use of resin cement.
Types of dental cement
Dental cement is generally hard, a brittle material formed when a powdered oxide or glass material is mixed with a liquid.
When mixed to a cementing consistency, dental cement are used to retain restorations such as an alloy or ceramic crowns and bridges and aesthetic inlays, on lays, and veneers.
When mixed to a thicker consistency, some cement can be used as temporary filling materials and also provide thermal insulation and mechanical support to teeth that are restored with other restorative materials, such as amalgam, composites, or gold.
There are various types of cement in dentistry that are utilized for different purpose some of them are mention below:
Glass Ionomer Cement
Glass ionomer cement is water-based cement used for final cementation of primarily alloy crowns and bridges. (3)
Bioceramic cement is permanent, radiopaque, luting cement supplied n capsules. It contains glass ionomer and calcium aluminate powder plus water.
Zinc Oxide–Eugenol Cement
Zinc oxide–eugenol cement are the oil-based cement that has a soothing effect on the pulp and are particularly useful for temporary cementation for a prepared tooth with exposed dentine. The addition of splinting agents to zinc oxide–eugenol cement has resulted in permanent luting effects.
Temporary cement is not so strong but is useful for short-term cementation of temporary stainless steel crowns and permanent restorations. Zinc oxide–eugenol cement is cement used for short-term cementation of temporary acrylic crowns and completed cast restorations. (4)
Zinc phosphate cement
Zinc phosphate cement is the water-based cement that has been used for final cementation, although its use today is limited. Because of its acidity at the time of placement into a tooth, pulpal protection is needed.
The cement is formed when a powdered oxide is mixed with an acidic liquid.
Adhesive resin cement
Adhesive resin cement is used for bonding of most alloy and ceramic restorations, except veneers, implant-supported crowns and bridges, and indirect resin restorations.
Aesthetic Resin Cement
Aesthetic resin cement is tooth-color or translucent resins available in a variety of shades. Aesthetic resin cement is used in bonding for all-ceramic and indirect composite restorations.
How Dental Cement Work?
The mode of action for dental cement is by creating resistance and retention when compressed, and in some types of cement, even formation of chemical bond is also noted.
The force of compressed cement underneath the crown holds and bonds it together. Chemical bonding in cement supply additional strength and they are less likely to break down than non-bonding cement.
Chemically bonded dental cement has high strength, and it causes difficulty during removal of the crown for a replacement or repair.
Dental cement can be great for patients who grind their teeth as these provide extra stability of crown and increase the chances of the crown to remain intact.
Dental cement for a temporary crown
A permanent crown takes some time to be fabricated. So, the dentists often fit a temporary crown which is prepared with dental cement until the permanent crown is introduced.
The temporary crown also checks the teeth and jaw relation of both jaws. Zinc oxide-eugenol cement is most commonly used as the cement for temporary crowns which are prepared with zinc oxide powder, eugenol, and olive oil.
Cement for the permanent crown
Cement that is used to make permanent crowns are Zinc phosphate, glass ionomer, resin-modified glass ionomer, and resin cement.
Zinc phosphate was one of the earliest and most reliable cement that have been used to make permanent crowns.
Latest dental glue for crowns includes Glass ionomer and resin-modified glass ionomer cement, usually made from fluoroaluminosilicate glass powder and polyacrylic acid liquid.
Permanent cement is strong and sustains for years, unlike a temporary crown which is easily breakable.
Temporary and permanent indirect restorations such as dental crowns, dental bridges or some removable partial dentures are attached to abutment teeth with a specific material called dental cement.
The crown is put inside the gaps present between teeth with the help of dental cement and crowns nicely adhere to it as long as no bacteria enters the tooth though gum line or other paths and change the shape of the tooth.
Any type of cement that a dentist uses to attach a crown, its longevity always depends on proper oral care. Crowns are prosthesis that only covers teeth and leaves the gingiva, where bacteria can get lodged and cause decay.
If you have a dental crown, brush and floss it regularly to increase its longevity.