Interesting, thanks for sharing. I just received an email from a dentist who said that Point 4 is a good hard filling material but it contains barium which you found out. Here is the email below. I too am trying to find a good product that is non-toxic. It's proving to be very difficult. I just sent him an email back so I will let you know what I find out. I've also been looking at Diamondcrown materials. They are supposed to be good. But of course that depends on who said it's good.
There are a few filling materials that you should consider. Holistore by Den-Mat is a composite that contains no Aluminum oxide, iron oxide or fluoride. The wear factor is not the best. Point 4 by Kerr is a good hard filling material however it contains barium. I use electrodermal screening to pick the best filling material for your system. I believe it is a better way than the blood test because it deals with energy of the material and your energy. The BelleGlass is used unshaded and bonded in with Panivia 21 that contains no fluoride. It is a hard material and seems to do the job. Hope this is helpful.