A Turkish man has revealed how a dental implant procedure went horribly wrong when the dentist allegedly pierced his jawbone and the screw ended up in his brain cavity. Ramazan Yilmaz, 40, went to a private clinic in Bursa, Turkey, with a toothache and ended up in hospital after the screw from an implant pierced his jawbone and into the area behind the eye where the brain and spinal fluid are located.