 Hard tissue injuries to teeth and bones can occur with contusions, such as Battle sign, which indicates basilar skull fracture, and so-called raccoon eyes, which indicate mid-face fractures.However, tooth fractures are the most common type of tooth injury, and can be categorized as crown infractions, enamel-only fracture, enamel-dentin fractures, and fractures that extend through the enamel and dentin into the pulp which are defined below.In addition to tooth fractures, there are several types of bone fractures as well.