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This randomized, controlled, double-blinded study related the effect of osteopathic manipulative treatment (OMT) of the temporomandibular joint (TMJ) and the orthostatic posture using the molar shim (MS) as a postural adjustment factor. Twenty individuals classified with temporomandibular disorder (TMD) were randomly assigned to a treated group (TG, n = 10) and placebo (PG, n = 10). The independent variables were: MS and OMT of the TMJ. The dependent variables were: DC-TMD data; local pressure pain using algometry; and orthostatic posture assessed by the distribution of plantar pressures (baropodometry), in the evaluation periods before and immediately after the interventions. Results: pain did not show a statistically significant difference after the interventions. However, when comparing the Effect Size (ES) between the groups in the post-intervention moment, a moderate relationship was observed for the left trapezius muscle (0.51) and right and left TMJ (0.41 and 0.54 respectively). When correlating the pain and percentage of anteroposterior postural dislocation variables, a significant moderate inverse correlation was observed in the post-intervention moment. The results of the MS pointed to a significant decrease (p ≤ 0.05) of the average peak pressure (Medium P) during the use of the MS (503.4 ± 44.1 kgf/cm2) and after performing the OMT (516.5 ± 49.6 kgf/cm2), both for the TG compared to the pre intervention moment (519.3 ± 42.9 kgf/cm2). There is a correlation between TMJ and orthostatic posture. OMT of the TMJ influences orthostatic posture. The MS can be added to the evaluative context of TMD. • The molar shim can be used as a test to highlight the TMJ on postural functional changes. • The evaluation of the stomatognathic system may have clinical importance in postural treatment. • The fascia represents the "connecting" elements that integrate the mechanical forces of the entire body. • The osteopathic manipulative treatment of the TMJ influences the postural system. [ABSTRACT FROM AUTHOR]