Z talked to me about bio-oss as well. He said basically the product is under patent protection so he couldn't say about how it is improved material compared to HA, but in his experience he would expect less complications with it. I talked to a a Spanish surgeon who uses it as well. He stopped using HA long time ago and feels more comfortable using bio-oss in terms of long-term safety. So, I have feedback about bio-oss from two surgeons.
After having lived a major infection from HA and ending up in hospital, I would avoid it, at least the type the butcher Mommaerts in Brussels uses, especially would avoid it in the orbital area. Z definitely said he's seen many cases with HA infections and it's complicated and expensive to remove. I know from personal experience. It would be good to clarify what type the butcher uses, as many people understand different things when they refer to HA. The type the butcher uses is definitely s**t.