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An articulator is a device to which upper and lower casts are mounted in order to reproduce the positional relationships of a patient’s upper and lower dentitions.  Essentially, the purpose of the articulator is to simulate the dental patient either for diagnostic purpose or to allow the dental technician to fabricate the definitive prosthesis.  The dentist can make several measurements of the patient’s facial structure using a face bow and transfer this information to the articulator.  Casts are used to simulate the patient’s teeth.  Using various settings on the articulator, a dentist or dental technician can then mimic the jaw movements of the patient and contour of the definitive prosthesis according to the functional and anatomical needs of the patient.