In vivo measurement of the 3D kinematics of the temporomandibular joint using miniaturized electromagnetic trackers: technical report

Baeyens, Jean Pierre and Gilomen, Hans and Pintens, Seppe and Wehrli, Brigitte and Clijsen, Ron and Cabri, Jan and Vissers, Dirk (2012) In vivo measurement of the 3D kinematics of the temporomandibular joint using miniaturized electromagnetic trackers: technical report. Medical & Biological Engineering & Computing.

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Abstract

Objective The aim of this study was to evaluate the use of miniaturized electromagnetic trackers fixed on teeth of the maxilla and mandible to analyse in vivo the 3D kinematics of the temporomandibular joint. A third sensor was fixed to the forehead and a fourth sensor was used as a stylus pointer to detect several anatomical landmarks in order to embed a local frame on the cranium. Results The point vectors of left and right tragus and the midpoint between the infra-orbital landmarks proofed most accurate to detect and were therefore used to define a local frame on the cranium. The differences in between the position of two mandibular respectively two maxillar fixed trackers remained under the magnitude of the relative translations between the forehead sensor and the sensor fixed on the maxilla, i.e. between 0.67 mm and -0.53 mm for the X-axis, between 0.49 mm and -0.54 mm for the Y-axis and between 0.73 mm and -0.55 mm for the Z-axis, which is negligible as compared to the translations of the condyle with opening and closing (13.1 ± 1.2 mm). These results suggest that a maxilla fixed sensor is the better alternative compared to a forehead sensor. Conclusion Using miniaturized electromagnetic trackers glued to the teeth is a user friendly and non invasive way to accurately quantify the motion of the TMJ three-dimensionally.

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