What type of cement is used for permanently cementing a cast to a tooth?

Glass ionomer cement is commonly used for permanently cementing a cast to a tooth due to its unique properties that make it particularly suitable for this application. One of the key advantages of glass ionomer cement is its ability to chemically bond to both the tooth structure and the metal of the cast. This chemical adhesion contributes to a strong and durable seal, which is essential for the longevity of the dental restoration.

Additionally, glass ionomer cement releases fluoride over time, which can help protect the surrounding tooth structure from decay, enhancing the overall health of a tooth that has been prepared for a cast. Its good seal against microleakage also helps reduce the risk of postoperative sensitivity and failure of the restoration.

Other types of cement, while useful in various scenarios, may not provide the same level of bond strength, fluoride release, or adaptability to the tooth structure and cast materials as glass ionomer cement does in this specific context.