Which materials are commonly used to seal the crown after root canals are filled?

The commonly used materials to seal the crown after root canals have been filled include calcium hydroxide, zinc oxide-eugenol (ZOE), and glass ionomers. Each of these materials has specific properties that make them suitable for this purpose.

Calcium hydroxide is favored for its antibacterial properties and its ability to promote healing in the dental pulp. It also serves as an effective base or liner for the cavity preparation, providing thermal insulation and protection to the pulp.

Zinc oxide-eugenol is known for its sedative effects on the pulp, as well as its ability to provide good sealing properties when used as a root canal sealer. It also has some antimicrobial properties that enhance its effectiveness in preventing infection.

Glass ionomers are used frequently due to their chemical bonding to both enamel and dentin, enhancing the seal and minimizing microleakage. They also release fluoride, which can help in preventing recurrent decay.

Each of these materials offers structural and functional benefits that make them ideal for sealing the crown after root canal therapy, contributing to the longevity and success of the endodontic treatment. Other materials, while useful in different contexts, may not possess the same combination of properties necessary for effective sealing in this specific scenario.