A few weeks ago I chipped a tooth. I had it repaired today by my dentist, who is always happy when I chip a tooth--I think I paid for his new set of ping irons.
Anyway, he applied a glob (technical term) of stuff (another technical term) to my tooth. I assumed it was an epoxy which would have to cure for quite a time before he could grind it down to match the old tooth. I was surprised when he pulled out a special light and the glob hardened in about 60 seconds.
That's right, he used a photosensitive dental composite. According to the Teck who was working with it, it hardens in proportion to the amount of light it receives (I drove her crazy with questions.). This got me thinking (always a dangerous thing), could this be used to make photographs? After reading all I could about the material on the net, I assume it could be used to make a plate like making line drawings on circuit boards. The dental composite may turn out to be more interesting, however, because it can be molded into any shape.