It appears that my scaffolding guess was correct but I think that the HAp will last much longer than the organic part of the filler. Over longer term of repeated use there may be a build up of HAp which I would expect to make the tissue hard and possibly cause damage.
In addition, the recrystallization rate of HAp might cause non homogenous redistribution (on a macro scale) such that hard spots might appear around injection sites.
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