An impression of your existing teeth is performed one week before your tooth extractions. This is mandatory so that your temporary prosthesis will be ready to use immediately after the extraction takes place. Your immediate prosthesis will be in place during the entire gum healing phase (which can take several months), so you can carry on your daily activities.
During the gum healing phase, your gums will shrink and change form. Therefore, your temporary prosthesis will need readjustments by filling the gaps between it and your gums. Readjusting the prosthesis does not only make it more comfortable and efficient, but it also helps for optimal healing.