Dentures are made in multiple stages to make sure they function and look as best as possible.
Impressions will be taken at the fist appointment to make a mould of your teeth and gums. The next appointment the dentist will take an impression of your bite in a wax material and maybe another impression is also required for a more accurate result. This helps the lab work out how you bite and shows them where to position the teeth. Then you will have a try in appointment, so we can see how it fits, check the bite and also the aesthetics of the denture, whilst the lab can still make adjustments as required. Finally the denture will be fitted by the dentist and they will ensure it fits well and make any final slight adjustments there and then.