The Sved appliance is used to treat functional muscle disorders, but liltle is known about its influence over the TMJxs condylar position. OBJETIVES: To determine the degree of condylar displacement at the glenoid cavity, at the center and medial pole, upon maximum voluntary clenching with a Sved appliance and its insertion. METHODS: Sixteen subjects without TMD according to the RDC-TMD classification participate in the study. Eight received a 4mm thickness Sved appliance, while the other eight one of 8mm. Both TMJ condylar positions were registered using a cone beam CT at maximum intercuspation (MIC) without the appliance, and at rest and maximum voluntary clenching with the appiance. The displacement magnitude was measured using a coordinate system developed to that effect. To standardize the imaging cuts at the center and medial pole of the condyle the One Volume Viewer program was used. RESULTS: Sved appliance at 4mm: The insertion produced in 56.25% an advance of 0.151mm (p=0.0584) and a descent of 0.367mm (p=0.0310) at the center, while a descent of 0.353mm (p=0.0695) at the medial pole. During clenching, the condyle ascended but not surpassing MIC (p>0.05). Sved appliance at 8mm: The insertion produced in 93.75% an advance of 0.536mm (p=0.0047) and a descent of 0.821mm (p=0.00001) at the center, while an advance of 0.796mm (p=0.00001) and a descent of 0.358mm (p=0.004), at the medial pole. During clenching, the condyle ascended positioning 0.499mm (p=0.00001) below and 0.396mm (p=0.0042) forward regarding MIC at the center, and 0.553mm (p=0.003) forward at the medial pole. CONCLUSION: The insertion of SVED appliances of 4mm and 8 mm thickness, produce an antero-inferior displacement, which is more pronounced at 8mm. During chenching with the appliance, the condyle ascended from this previous position without surpassing MIC at 4mm and without reaching it at 8mm.