My iPhone wont respond to touch please help?

Hey everyone. A couple of months ago i was sitting with my friends on a bench in the park. I dropped the iphone on the ground and it hit the grass. There were no rocks or anything so i thought i was fine. I turned it on and the screen was not damaged. It simply did not respond to touch. There are no blank pixels or anything. I've seen on this website that there is the front panel replacement kit. I don't know what to buy to fix my iphone. The warranty is over. I also want to buy the back case. The iphone is the Iphone 3g. What parts do i need to fix it? I know how to take it apart and how to replace parts, i just don't know what parts to buy. I've also tried the reset which you hold the home button and the lock button thing. It still doesn't work. Please help!

Thanks in advance

-----------------------

Also

Im so confused, is the digitizer is the glass? Therfore thats what i need to buy so that my iphone responds to touch correct? I dont need to buy the LCD because the LCD on my iphone is not damaged. Im about the buy the front panel kit from IfixIt, is this what i need?