Porcelain crowns are protection for teeth with enough decay that they cannot be restored with fillings. A crown protects the tooth structure underneath by encasing the entire tooth surface. By encasing the entire tooth structure, the crown strengthens the tooth and restores the appearance to the original size and shape. Similar to composite fillings, there are several different materials used for crowns. Porcelain crowns are used most often because of the natural tooth-like coloring. Porcelain crowns not only resemble natural teeth, but they are also very durable. Each porcelain crown is made to match the shape, size, and color of your natural teeth.