Ellis Class I- 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.
Ellis Class II - 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.
Ellis Class III - 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.
Ellis Class IV - Traumatized tooth that has become non-vital with or without loss of tooth structure.
Ellis Class V - Luxation: The effect on the tooth that tends to dislocate the tooth from the alveolus.
- Teeth loss due to trauma.
Ellis Class VI - Avulsion: The complete separation of a tooth from its alveolus by traumatic injury.
- Fracture of root with or without loss of crown structure.
Ellis Class VII - Displacement of a tooth without the fracture of crown or root.
Ellis Class VIII - Fracture of the crown en masse and its replacement.
Ellis Class IX - Fracture of deciduous teeth.
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