How long after Sculptra & Voluma am I in the clear for vascular occlusion/complications?

I recently read an alarming article on fillers & vascular occlusion and was wondering how long after your last filler injection would put you in the clear? FYI My last Sculptra (temples) was 5 mos. ago & Voluma (temples, jawline, brow) 7+ mos. but was looking fwd to doing more soon. Also, would Voluma be considered safer than Sculptra in these areas? Thx!