There are a variety of dental implant types available. The one you choose depends in part on which teeth you need to replace. Most require a similar method of placing the implant, allowing the site to heal, and then installing the crown. Take the time to understand the different options available so you can make an informed decision when consulting with your dentist.
The most simple of implants is the single implant. In most cases, this type of implant is only used to replace a single missing tooth. If you have two or three missing teeth that are not beside each other, then you may need to get a single implant for each of these missing teeth. There will be only one crown—the part that looks like a natural tooth—for each implant, which is the metal post that is inserted into your bone.
For those missing several adjacent teeth, the supported bridge is a much better option. You will need fewer implants since one implant can support several teeth. Fewer implants also means lower cost. The implant is installed in the location where it can best support the necessary bridge. The crowns are then affixed to a bridge that is molded to the shape of your gums, and then it is attached to the implant post. Teeth don't necessarily have to be fully adjacent for a supported bridge, either. For example, if you have two missing teeth but a natural tooth between them, then a bridge can be made that allows space for the natural tooth between the two crowns.
A supported denture is sometimes called an "all on four". This is because four implants are installed—one for each quadrant of your mouth. Then, a top and bottom set of crowns are placed on a denture base. The base is affixed to the implants with two implants per denture. This is much less invasive and requires less healing time than trying to put in an implant for each crown. Supported dentures are best for those that are missing all or most of their teeth on the top or bottom jaw. Unlike traditional dentures, a supported denture will act much like your natural teeth. You will brush and care for them the same, and you won't have to worry about them slipping.
Contact an implant dentist in your area to determine the right implant for your needs.