Inclusion Criteria:  who are ready for orthognathic surgery, , convenient to obtain centric relation records and gave consent.  Exclusion Criteria:  have any syndromes, cleft lip and palate, bruxism, TMJ or muscle disfunctions, used or under any medication like muscle relaxants, narcotics and antidepressants, use prosthetics or have toothless areas that can affect the wax impression for centric record, used horizontal elastics within the last 2 months