Correlation Between Missing Posterior Teeth and Vertical Dimension Measurements With Temporomandibular Joint Disorders in a Sample of Adult Egyptian Subjects

The goal of this observational study is to learn about the correlation between missing posterior teeth and vertical dimension cephalometric measurements with temporomandibular disorders in a sample of adult Egyptian subjects in. The main questions it aims to answer are: * Is there a correlation between missing posterior teeth and temporomandibular disorders? * Is there a correlation between vertical dimension cephalometric measurements and temporomandibular disorders? Participants will be asked for the following:- * to give their phone numbers \& it will be collected through the orthodontic department patient's database ensuring complete confidentiality. * to fill Personal data chart (name, age, date of birth, mobile number, address). * to receive Clinical examination to determine number of missing teeth. * to receive Clinical examination to diagnose TMD using the DC/TMD. * to do Lateral cephalometric radiograph to measure the vertical dimension.