Abstract
Accurate diagnosis of mandibular motor function requires comprehensive examination and testing ofboth opening/closing and various eccentric movements. Depending on the treatment plan derived from thediagnosis, we may perform mandibular movement testing or complementary mandibular movement testingto transfer the mandibular movement information to the articulator, as well as to assess the state of jaw andoral function. The measurement of the condylar path during mandibular movement is critical; specifically,the sagittal protrusive condylar inclination is closely related to the height of the occlusal surfaces in the molarregion and the sagittal incisal inclination in the anterior region. Therefore, it is an important factor to considerwhen constructing an occlusion harmonized with jaw and oral function. Traditionally, mandibular movementmeasurement employs a mandibular condyle movement path measurement device, which requires securingthe Lower Facebow to the mandible via a tray clutch attached to the mandibular dentition. However, thethickness of this clutch presents a significant methodological concern: it can cause condylar displacement,potentially leading to substantial measurement errors. Therefore, this study was conducted to examine thispotential measurement error. We gathered multiple subjects and measured the sagittal protrusive condylarinclination using the mandibular movement recording device, both with and without the tray clutch in place.Concurrently, we performed standardized TMJ radiographs. We then compared the measurement results forthe inclination of sagittal protrusive condylar path and the condyle position obtained from these two distinctmethods.
