When there is insufficient space for a prosthesis due to excessive tooth wear, prosthetic restoration is necessary at the position where the original vertical dimension needs to be restored. The loss of posterior teeth loss results in the occlusal plane collapsing due to the extraction of the antagonist teeth and the lack of posterior support results in severe wearing of the remaining teeth. This approach maintains the patient’s actual maxillomandibular relationship at various vertical heights and can also reduce the chair time required when adjusting for errors. The printed cast is mounted on an articulator for subsequent procedures. After determining the optimal vertical dimension with consideration of the space required for restoration, maxillary and mandibular STL files are exported and the designed cast is created using a 3D printer. Additionally, then the occlusal vertical dimension is set to a new position based on the obtained trajectory. The movements of the targets are replaced with the movement of the patient’s oral scan data. Target materials for performing tracking are attached to the maxillary and mandibular anterior teeth to record opening and closing movements of the patient’s mouth in real time and align the patient’s scanned intraoral data or cast data. There has recently been increasing interest in tracking the trajectory of jaw motion of a patient, and this paper presents a new technique for altering the vertical dimension based on the measured trajectory. However, this can inevitably cause errors due to differences between the articulator hinge movement and the actual trajectory of the patient. When a change to a vertical dimension is required during the conventional prosthesis construction process, the maxillary and mandibular casts are mounted on the mechanical articulator using a facebow and bite registration and the elevation of the anterior guide pin of the articulator is used. Clinicians and researchers have used various methods to reproduce the maxillomandibular relationship and mandibular movement of individual patients using an articulator, with efforts being made to reduce errors associated with the conventional technique.
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