Dear Dr R,
Permit me to make my observations -
A 60 yr old pt who has had Immediate post extraction Implants done would heal rather slowly as one is expected to take into account the following facts
(I AM PRESUMING AS ALL OTHERS HAVE SO FAR THAT YOU ARE DOING A FULL ARCH REHAB OF THE MAXILLA)
1.Extractions and accompanying Inflammatory phase (Amler et al 1969)would result in an initial negative tissue response. Add to it the bone response to drilling (in a significantly more cortical bone with less Spongiosa - as in a 60yr old maxilla)it would add to the insult.
2. If the canine Implant was placed in an extraction socket and the adjacent (Lateral and Premolar) areas were previously edentulous already, it is likely that the Canine alveolar ridge was protruding out of the confines of the arch of form in the residual Maxilla. Making it quite likely that the Implant in its most apical position was actually positioned with a portion of its apical threads out of the confines of bone or with a thin sliver of recipient bone around it at the time of insertion.
(RADIOGRAPHS BEING 2-D WOULD NOT DISCLOSE THE PERFORATION OF THE BUCCAL CORTEX IN THE CANINE REGION)
3)If you did manage to get a few MDIs like you mentioned, then you may have had situation as the MDI's were probably inserted in the adjacent edentulous areas.
As a result you probably were required to raise a considerable amount of soft tissue (both attached gingiva and alveolar mucosa) off its attachment during surgery.
As Dr Hughes / Dr Moslemi and others pointed out (and you you have probably already noted) there is the possibility of the denture flange extending well into the Canine fossa region which would cause the swelling to be clinically contained within the precincts of the Central Incisor - Canine areas.
So after the initial wound healing took place, the perforation in the Canine region (or even the Nasal floor if you had less vertical height there and did violate the floor inadvertently during Implant placement)starting playing up and began to manifest as a swelling in the localised region.
5) I would however, strongly be inclined to believe that residual periodontal infections are one of the chief perpetrators of the "Early-delayed" swelling situations.
They have a way of sprouting sometime after the aftermath of the surgery has settled down.
Do we then discount the probabilities of Bisphosphonate therapy as Dr Emil Shiri points out, or Malignancies as Prof Jafari mentions ?As Dr Chow rightly says, it could be one of a gamut of causes which are usually considered the 'RARE' causes in literature (if you and the patient have been unlucky enough to have encountered them in this case !)
Well, would be really good from the Medico-legal standpoint to have them be discounted off straigthaway with appropriate investigative modalities - A CT and some Lab work would do the trick I am sure).
Having gotten these seemingly rare causes out of the way , you obviously would be wanting to get the swelling "Out-of-the-way" and get on with it !
ANTIBIOTICS - ??
I don't know too many folks in my fraternity ( I am a practicing OMFSurgeon since 17 years) or outside who would see a clinically presenting swelling with no reasonable cause and think twice to prescribe antibiotics.
We all do that I guess. The back up to rationalize the choice of Antibiotic therapy (which is usually empirical initially) would be the C&S result which would be a good 48 to 72 hrs later.
In your case, the choice of CLINDAMYCIN + METROGYL seems justified, as the combination covers the the range of micriobota very well.
Clindamycin is proven to be effective against Stretococci (from pyogenes to pneumoniae) including those which are usually resistant to Macrolides and some Quinolone derivatives . An Imidazole derivative such as Metrogyl as every dentist who has seen enough Odontogenic infections in the Head and neck region also is know is invaluable in quelling any microbiota suggestive of an Anaerobic infection. Although I must admit Antibiotic abuse is rampant, the line between Use and Abuse can at times get a little thin.
PLAN ?
I would follow the paths suggested by Drs Harpaz and Shamray.
1)Relieve the region of the prosthesis for a while
2)Get suitable investigations done to rule out the fringe possibilities (shud I say Impossibilities ?? )
3)Raise flap if it gets bad, revisit the wound for a more accurate visual assessment - debride , irrigate if necessary clear devitalized tissue debris)
4)Redraw the plan for provisionalization
5) Perform second stage grafting if necessary after subsidence of the acute phase.
Good luck doc
Cheers
Jeevan
So,