EMPLOYEES WERE AT THE DUST COLLECTOR; ONE WAS INSIDE CUTTING REPLACEMENT BAGS. THE WIRE CAGE HASTO BE RAISED UP IN ORDER TO CUT THE BAGS. AN EMPLOYEE ON TOP OF THE DUST COLLECTOR WAS WAITING F OR THE CAGE TO BE HANDED TO HIM. HE LEANED OVER AT THE SAME TIME THE OTHER RAISED THE CAGE. THE CAGE STRUCK HIM IN THE MOUTH CAUSING A BLOW TO HIS TOOTH.