A haunting selfie taken by an Arizona man hours before he suffered a fatal brain injury during a routine dental implant procedure has resurfaced as his distraught parents settled his wrongful death lawsuit. Derek Swanson, 40, took a picture of himself beaming in a dentist’s chair on March 3, 2023. He captioned the photo: “Yesterday, new car. Today, implant! Fun never stops.” Swanson, an avid gym-goer, was eager to receive a long-awaited dental…