I'm not really following here, if the bone looks a bit marbly or however you want to describe it, that probably wouldn't show through unless your super old? It can't be smoothed out? Supposedly a medpor implant could be shaved even after it's been in one's chin (per Dr. Stephen Warren), so why not HA if its applied directly to the bone?. And if you for whatever reason wanted an implant down the line, can't you just get a custom one that would sit properly over the HA paste but outwardly give a normal, smooth implant 'look'?