The initial stage for having an implant done is the investigation. This stage is where the implantologist will go through options with you, take x-rays and photographs and start to plan exactly where the implants will be placed.
During this stage sometimes the implantologist will request that you have a 'surgical guide' made. This is like a denture that is clear and has holes drilled into it. This assists the implantologist when placing the implants to improve accuracy.
They may also request that you have a CBCT scan done. This allows them to use special programs on their computers to plan and place implants. This means that they have an even better idea of the best place to insert the implant to ensure the highest success rate.