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So when you say screw fell out can you elaborate...you mean healing abutment, or you had a temporary that fell out, or the crown?
You can always take picture of the area if that's easier to explain, and when you state you screwed it back in how did you accomplish that?
Ok, so maybe you are actually meaning the abutment? Because the implant is deep in your bone, and then an abutment screws into that and its the abutment that typically holds the crowns or dentures. So abutment I'm hoping is what you mean.
Ok, good! What can happen is a screw can loosen within the abutment when unusual or increased amounts of torque are placed opposing it, so the good news is that an abutment coming out doesn't (again DOES NOT) mean implant failure. It more than likely means dentist may need a different abutment type or that it just needs to be torqued tighter.
It may take a little trial and error to figure out the best way to break that suction. If you already recognize that the front implant is the issue, then a couple options would be to try to break suction from the right or left first (in the posterior implant area I mean). In an ideal world you'd control both sides of denture in back and stabilize the front and in even grip remove it straight up and out. Pretty tough to do until the copings in the denture wear in a little more. The biggest advise I'd give you is to make sure that you don't grab it from the back and flip forward and out cause thatll exert the most unnecessary force on the anterior one. Also, when you go to your dentist this week he may need to adjust that anterior abutment attachment so that it removes a little easier up there.
That may keep you comfortable until you see your dentist, but there is likely a microgap between the abutment and implant so micro-movement is causing the irritation. So be gentle with eating in the front portion to not over work the area as it's not fully seated into the implant.
Is there anything more I can help you with? If not please take a moment to rate the post. Take care!
The dentist that re-inserted your abutment? Hopefully now the gum will be less sore now.