Three teeth have been extract from the lower jaw, i plan on having inplants if there is no bone loss how long should i wait before i have a cbct scan?

About 3 months: Hopefully your dentist/surgeon grafted the sockets of your extracted teeth. Bone will usually begin to remodel almost immediately. If the sockets were not grafted then there is a good chance you will lose bone height and volume when it is healed enough to do the scan. If you lose too much bone you may not be able to have implants placed without an additional surgery to replace it.

Minor point: I agree with most of the answer provided but add the caveat that it depends on the implant method used. In addition to grafting some dentists place the implants immediately. Then others, like me, use mini implants which do not require a large bulk of bone and perform quite well, depending on individual circumstances.

Treatment planning: Philosophies and methods vary among dentists as well as specific circumstances that cannot adequately be evaluated over the internet. What is important is that you discuss this with the surgeon and restorative dentist (one in the same or separate) who will actually be treating you. They can evaluate your situation and go over timing of procedures.

2 to 3 months: Latest study showed that immediate implants may be at a higher risk of implant failure and complications than delayed implants. The study suggested 2 to 3 months of alveolar ridge remodeling following tooth extraction is an optimal time. It may be inconvenient to some patients, but the results are more predictable. Just remember, if the maintenance is good, dental implants can last a lifetime.

Cbct scan: Don't know what a cbct scan is. If the infection is cleared up and gone then you can have implants.

Implants: Did your dentist do a bone graft? Generally it takes t least 3 months of healing before implants are placed. This is best determine by the dentist who will be placing your implants. Discuss the time frame and all of your concerns and questions with your dentist.

Ask: Ask the Dentist or dental specialist who will be placing the implant fixtures. Generally about 3 months but there may be reasons for altering this time average. Know that there may be a time lag between calling for an appointment and the availability of an appointment, so work this out with the appropriate practitioner.