Chronic sinus infection as a result of dental implant

[Tubochka]

Chronic sinus infection?  I have gone for a dental implant about 2 months ago.  The implant was done on the upper left side. Following the surgery I ended up with chronic sinus infection, for which I took a course of amoxicillin.  That did not help and the oral specialist put me on augmentum.  Upon completion of that, infection came back 3 days later.  My dentist explained that inane a chronic sinus infection and would have to take implant out.  He removed the implant, cleaned the sinus and prescribed another course of augmentum.  
That did not help with the problem, as infection did not go away.  The surgical site seems to have cured but infectionis still in my sinus. He response from the dentist is 'I do not know- I have never seen cases that antibiotics so not work'.

I went to see ENT at this point who Prescribed omnicef and a nasal spray.  This does not seem to work as I still have foul smelling discharge from my nose and post nasal drip.  My teeth on the left hand side of the mouth still hurt (but they do not seem to be the source of infection) and still have headaches.
I was wondering if anyone has been in a similar situation and if there are additional things I could be doing.

[Caryopteris]

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[Caryopteris]

http://emedicine.medscape.com/article/863062-overview

It often goes fungal after treatment with antibiotics.