AP BIOLOGY

Detailed explanation-1: -The crown is the part of the tooth that you can see above the gums. The root is the part of the tooth that is below the gums. The top layer of the crown is enamel. Below the enamel is dentin, which surrounds the pulp.

Detailed explanation-2: -Crown: The visible portion of the tooth, or the white part that you use to bite and chew. Enamel: The hard surface of the tooth, or the outermost layer that you clean when you brush.

Detailed explanation-3: -If a gap forms between the gum tissue and the restoration, it’s a sign your crown no longer fits. Gum recession often results from an infection caused by improper oral hygiene habits. The gap will trap plaque and food particles, feeding the bad bacteria.

Detailed explanation-4: -Metal Showing Through At the time your crown was fitted, you may not have noticed a black line because it was hidden underneath the gumline. But as you age and the tissue recedes, the border between your crown and the natural tooth becomes visible.

Detailed explanation-5: -The clinical crown is the tooth structure that can be seen when looking into your mouth, while the anatomic portion also includes tooth surface hidden by the gumline.