Crown en-masse fracture is:
Class I: Simple fracture of the crown involving enamel.
Class II: Extensive fracture of the crown, with considerable amount of dentin involved but no pulp exposure.
Class III: Extensive fracture of the crown, with considerable amount of dentin involved, with pulp exposure.
Class IV: Traumatized tooth becomes nonvital (with or without loss of crown structure).
Class V: Tooth lost due to trauma.
Class VI: Fracture of root with or without crown or root structure.
Class VII: Displacement of the tooth without crown or root fracture.
Class VIII: Fracture of crown en masse.
Class IX: Fracture of deciduous teeth.
Ellis 1 fracture
Ellis 2 fracture
Ellis 8 fracture
Ellis 7 fracture