crestal resorption

crest·al re·sorp·tion

(krestăl rē-sōrpshŭn)
Resorption of the crestal bone of the alveolar ridge.

crestal resorption (kres´təl rēsôrp´shən),

n bone resorption at the border or crest of the dental alveolus. This bone loss follows tooth extraction and may result from periodontal infection or through the use of heavy orthodontic forces.