This Clinical and radiographic study will be designed to evaluate the temporomandibular joint condition post longstanding mouth opening during dental procedure using rubber dam. primary outcome : preoperative and postoperative assessment of interincisal distance , occlusal biting force , visual analogue scale , lateral excursion movement and Magnetic resonance imaging (MRI).
Secondary outcome: investigator will try to answer the question of what is the best duration of time could the dentist use rubber dam isolation in dental procedures without harmful effect on TMJ and its supporting structures?
Patients aged from 18 - 40 years old of both sexes.
No evidence of bad habits that affect occlusion like bruxism or clenching.
Patient with normal occlusion.
Patient free of any signs and symptoms of TMD and myofascial pain.
Patient with systemic or local diseases that can affect TMJ like osteoarthritis, rheumatoid arthritis, or systemic lupus erythema.
Patient with trismus.
Patient with Recurrent dislocation of TMJ.
Swelling affects mouth opening.