What is the success rate of second tooth implant after an infection?

Hello Milton,
An infection with any surgical procedure is always possible regardless of previous infection. However with proper curettage of the infection site and a successful bone graft an implant usually should not fail. That being said one of the risks of every implant is infection. You can always have your doctor put you on a antibiotic after implant placement to prevent issues. Usually 7 day course is adequate. 
Best Regards,
Sanaz Vahid DDS 

That's very unfortunate, I always preface my comments by stating that photos and x-rays are helpful to give a more accurate assessment.  Hopefully the second implant will integrate well and last a very long time.  The success of an implant really depends on multiple factors:  1)  Health - presence of smoking, uncontrolled diabetes, autoimmune diseases, "bone diseases" such as osteopenia/osteoporosis, or medications that can alter your inflammatory response will compromise the longevity of an implant among many.  2)  Oral health/hygiene - diligent routine to thoroughly clean around your implant as well as frequent professional maintenance at your dentist to eliminate plaque and bacteria  3)  Amount of vertical bone height, depth and width available for the implant to "fit" and integrate with your jaw bone properly.  A cone beam CT scan is helpful in 3D planning, to help determine if there is adequate bone for the implant to be placed.   4)  Skill, expertise, technique and planning by the treating clinician - whether that's a general dentist, oral surgeon or periodontist.  Pre-planning (CBCT) and obtaining a complete medical history in my opinion are the most important components of successful implant placement.  Also following aseptic technique principles, in which the clinician must exercise caution while performing the implant surgery not to contaminate any instruments or introduce bacteria into the mouth, and verify any presence of infection is thoroughly cleaned, disinfected and eliminated.  If bacteria are still present as the implant is placed, it will most likely fail.  Sometimes a ridge augmentation or bone graft may be necessary to facilitate implant healing and success.  Finally the type and manufacturer of the implant are important too.  There are many types, shapes and sizes that coincide with different cases, scenarios and also location in the mouth - front of the mouth, back, upper, lower, etc.  The clinician must be selective in choosing the appropriate implant design for your needs.  Hope this helps, good luck!