Metal Crowns**
A dental crown, also known as a cap, is a restoration that covers the entire visible surface of a damaged or decayed tooth. It is an indirect restoration, meaning that it is made outside of the mouth and subsequently cemented into place. Crowns act to strengthen a damaged tooth, protect a cracked tooth, restore a worn-down or broken tooth, hold a dental bridge in place, cover a severely stained or discolored tooth, cover a root canal-treated tooth, cover a dental implant, or prevent further decay. They are typically made of metal, ceramic, or a combination of materials.
History of Metal Crowns
Metal crowns have been used inodontistry since ancient times when gold and silver were used as Crowns due to their high biocompatibility and resistance to corrosion. Over the years, other metals such as palladium, gold alloy, and base metal alloys have also been used to make crowns. With the development of dental technology, the materials and techniques have advanced, making crowns more durable and realistic.
Types of Metal Crowns
Gold Crowns
Gold crowns are made from gold alloy, which is highly biocompatible and resistant to corrosion. They have a high modulus of elasticity and can withstand heavy forces without wearing down the surrounding teeth. Gold crowns are typically used for molars and premolars.
Silver Crowns
Silver (stainless steel or cobalt-chromium) crowns are durable and affordable, but they can become discolored over time due to tarnishing. They are often used for anterior (front) teeth.
Platinum Crowns
Platinum crowns are made from platinum alloy, which is stronger, more durable, and resistant to corrosion than gold or silver crowns. They are more expensive than other types of metal crowns, but they are considered an excellent choice for tooth-colored crowns.
Palladium Crowns
Palladium crowns are made from a combination of palladium, gold, and other metals. They are a good option for patients with metal allergies because they are less allergic than gold.
Base Metal Alloy Crowns
Base metal alloy crowns, such as nickel-chromium or titanium crowns, are strong, durable, and affordable. They may cause allergic reactions in some patients, however.
Why Choose Metal Crowns
Metal crowns are often chosen for their durability and strength, making them appropriate for back teeth that receive significant chewing forces. They can last for up to 15 years or more with proper care and maintenance.
Disadvantages of Metal Crowns
Color Discrimination
One of the principal disadvantages of metal crowns is their color. They are typically not the same shade as natural teeth and may be more noticeable than other types of crowns, especially when they are used on front teeth.
Heat Conductivity
Metal crowns can conduct heat and cold, which may cause discomfort in some patients.
Wear on Opposing Teeth
Metal crowns may cause more wear on opposing teeth over time, due to their hardness.
Cost
Metal crowns can be more expensive than other types of crowns, depending on the type of alloy used.
Crown Process
- Preparation and impressions: The first step in getting a metal crown is to prepare the tooth by removing any decay or damage and shaping it to fit the crown. impressions of the tooth and surrounding teeth are then taken.
- Crowns Production: The crowns are custom-made in a dental laboratory and returned to the office when ready. A temporary crown may be used during this time.
- Crowns Placement: The permanent crown is placed on the tooth, which is checked for fit and adjusted if necessary. Adhesive cement is used to secure it.
- Aftercare: Regular check-ups and cleanings are required to maintain the health of the crown and surrounding teeth.
Cost
The cost of metal crowns can vary depending on several factors, including the geographic location, the dentist's experience and expertise, the complexity of the case, and any additional procedures required. Generally speaking, metal crowns are more affordable compared to other types of crowns due to the cost of materials and the simplicity of their fabrication process.
