Ultrasound Investigation of Tongue Movement for Implant Overdenture

Inclusion Criteria: * All patients were completely edentulous for at least one year, had a normal maxillo-mandibular relationship, and had available inter-arch space. They were nonsmokers and free from any systemic diseases that could affect implant osseointegration Exclusion Criteria: * Patients with head and neck surgery, skeletal deformity, and temporomandibular joint disorder were excluded from the study.