How to plan screw retained restoration | What information we get from provisional bridge

We started by extracting all the teeth, and then we placed eight implants and four bridges from second molar to second molar. We placed multi-units right after the implantation and then took some impressions so we could make a new provisional bridge. Once the provisional bridge is placed in the mouth, we sent the patient home for 3-4 months, after which she came back for us to change the lower bridge. What happened next watch in this video.