Inclusion The study will include 60 adult patients (>18 years old) with ASA physical status class I and class II scheduled for elective surgery under general anesthesia where SADs ara planned to be used as airway devices  Exclusion Criteria:  Patient refusal limited mouth opening(<2 fingers) Facial &upper airway trauma Patients with dentures or who were edentulous (as accurate objective measurements would be difficult to determine) Head and neck surgery (as surgery may influence TMJ function) GITsurgery (as SAD doesn't completely protect air way against aspiration ) Pt with preexisting tempromadibular joint dysfunction Duration of anaethesia less than 1 h or more than 4hs-