One implant failed. How soon can I attempt to replace it?

This varies in every case and area of the mouth, but I would say the average wait time is 3-4 months before attempting another implant.  The use of a 3D CT scan is very beneficial in determining if adequate bone is present to attempt another dental implant. Good luck.  

usually a bone graft procedure is done once the failed implant is removed ( depending on amount of bone destruction as a result of infection around the failing implant) Depending of the amount of bone regeneration needed, a wait time of 4-6 months is needed before another implant is placed pending adequate bone regeneration. If Bone graft is not done at the time of removal of this failed implant, about 2-3 months of healing is neededusually a CBCT scan is done to evaluate the available bone and decide if a new implant could be placed.  If adequate bone is not present, the bone will need to be regenerated. 

minimum wait time after implant failure is 3 months, ideal wait time is 6 months. if socket is filled with bone graft, it will take little longer time.