Enamel fracture: This level of injury includes crown fractures that extend through the enamel only. These teeth are usually nontender and without visible color change but have rough edges.
Enamel and dentin fracture without pulp exposure: Injuries in this category are fractures that involve the enamel as well as the dentin layer. These teeth are typically tender to the touch and to air exposure. A yellow layer of dentin may be visible on examination.
Crown fracture with pulp exposure: These fractures involve the enamel, dentin, and pulp layers. These teeth are tender (similar to those in the Ellis II category) and have a visible area of pink, red, or even blood at the center of the tooth.
Traumatized tooth that has become non-vital with or without loss of tooth structure.
Luxation: The effect on the tooth that tends to dislocate the tooth from the alveolus. Teeth loss due to trauma.
Avulsion: The complete separation of a tooth from its alveolus by traumatic injury. Fracture of root with or without loss of crown structure.
Displacement of a tooth without the fracture of crown or root.
Fracture of the crown en masse and its replacement.
Fracture of deciduous teeth.