Trans-gingival or Subcrestal Short Implants Posterior Maxilla Bone Changes

a minimally invasive full-thickness flap will be raised in order to visualize the anatomy of the ridge. The vertical thickness of the supracrestal soft tissue will be measured and recorded. The preparation of the implant site will be performed with rotary burs and the bone quality will be recorded. An implant will be placed according to the manufacturer's recommendations. The length of the implant will be chosen in order to obtain a bicortical anchorage on the floor of the maxillary sinus