If you get infection on your tongue side, I am assuming, most probably, the jaw bone was perforated, and the tip of the implant is hanging out of the
jaw bone, cannot see it on xray, unless you get a
cat scan done. If this happened on the upper, and the tip of implant ended up in sinus, it's generaly ok. On the lower molar area, it's starts out thick and then it narrows down, to a thinner thickness.