Holes in 3d objects?

Hello, I’m dealing with a problem and I can’t find a way to fix it…
32116-hole1.jpg

as you see, there is a hole in my model that I’ve created with 3ds max, but if you look from the back of the model

32117-hole2.jpg

the empty space is actually filled, but I also noticed that the top of the horn has a hole as well… how do i fix this?

This is more than likely due to a problem with the face normal… you need to double check in your 3D editing software that they are all correct.