The hinge is made of metal so you most likely cracked the plastic case and bent to metal hinge or it is possible broke the weak aluminum screws that hold the hinge to the laptop body. From the photo you posted it looks like the screws have come loose and possible broken.
You need to get the top case off of the laptop and expose the part of the hinge that is inside the laptop body. It will look like this.
http://i.imgur.com/Mr6RWF1.jpg
Then post more photos so I can see what the damage really is or you can judge for yourself and might be able to bend the hinge back.
###WARNING###
Remove the battery before dissembling laptop to avoid electric shock
Under no circumstance use power tools to disassemble laptop.