Creating a web flash service to model a graphical treatment plan

You need an interactive site where, by going to your personal account, you can create a graphic treatment plan (dentistry).
It's for doctors.
It's made in the form of a modular editing system, like the layers in Photoshop.
It is possible to dynamically manage patients.
The last visit and manipulations carried out.
There will be text content, but more emphasis on graphics.
Ability to save on a computer in PDF format
Possibility for further development.