A digital approach to dynamic jaw tracking using a target tracking system and a structured-light three-dimensional scanner

Abstract

The digital implementation of mandibular movement using a 3D optical scanner and target tracking system is not prone to the same restrictions and limitations inherent in mechanical equipment; therefore, it is possible to reconstruct more realistic movement(s). This technique can be used in a wide variety of dental applications involving movement of the mandibular jaw, such as fabrication of dental prostheses, or for the diagnosis and treatment of temporomandibular joint disease.

Measurement of normal and pathological mandibular and temporomandibular joint kinematics: A systematic review

“…By attaching adhesive markers to the surfaces of the mandibular and maxillary incisors, and inserting a lip and check retractor to ensure consistent visibility of the markers, their positions may be tracked during mandibular movement using a structured light 3D scanner at a framerate of up to 50 frames per second (Figure 8). A previous study has registered this motion data to 3D cone-beam CT scans (CBCT) to evaluate condylar trajectories during mandibular border movements (Kwon et al, 2019). Alignment of kinematic data from the 3D scan to the CBCT models is achieved via image registration software.…”

“…Alignment of kinematic data from the 3D scan to the CBCT models is achieved via image registration software. This method of mandibular kinematics measurement may be applicable to the clinic, since it requires only the placement of a retractor and small adhesive markers, and is fast and low cost (Kwon et al, 2019). By attaching small markers directly to the teeth, skin motion artefact and unintended loading of the mandible can be mitigated; however, it may restrict natural mandibular motion, while CBCT registration greatly increases data processing time and exposes participants to ionising radiation.…”

“…By attaching small markers directly to the teeth, skin motion artefact and unintended loading of the mandible can be mitigated; however, it may restrict natural mandibular motion, while CBCT registration greatly increases data processing time and exposes participants to ionising radiation. One study of moderate quality showed that 3D scanning can be used to quantify the position of a circular marker with a precision of 4.1 -6.9 µm (Kwon et al, 2019).…”

Restorative Space Analysis by Jaw Motion Tracking Using a Template in Completely Edentulous Patients

“…Although several methods for transferring jaw movement data into digital software have been suggested [12], they require the patient to wear bulky equipment, which interferes with natural jaw movements and is also uncomfortable, restricting their clinical application. A target-tracking method has been described to overcome these limitations, wherein target materials and an optical scanner are used to scan jaw movements, and the data are overlaid onto a full arch model using reference points [13][14][15][16]. This approach is more rapid than conventional methods, is conducive to patient comfort and natural movements, and does not involve exposure to ionizing radiation [13][14][15][16].…”

“…A target-tracking method has been described to overcome these limitations, wherein target materials and an optical scanner are used to scan jaw movements, and the data are overlaid onto a full arch model using reference points [13][14][15][16]. This approach is more rapid than conventional methods, is conducive to patient comfort and natural movements, and does not involve exposure to ionizing radiation [13][14][15][16]. However, within the limits of the author's knowledge, no technical note has yet been reported that analyzed the restoration space of a complete edentulous patient using the jaw motion tracking technique and attempted vertical dimension alteration.…”