<prompt> Crown en-masse fracture is:Ellis 1 fractureEllis 2 fractureEllis 8 fractureEllis 7 fracture  <response>: 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. 