The use of magnetic sensory system for mandibular movement patterns recording in patients after TMJ reconstruction

Abstract

The aim of this study was to record mandibular kinematics in patients after total TMJ endoprosthesis using a magnetic sensory system. The movement of the mandibular was examined in 10 patients who underwent TMJ reconstruction using total endoprostheses. The condylar range of motion, the angle of the transversal condylar inclination (TCI), the speed of joint movement (max S) and the stability distance between the position at the beginning of movement and at the end (Start/end) of TMJ prostheses and native joints were measured 1 week before surgery (T0) and 12 months after (T1). The study showed an increase in the linear distance of the native joint when opening (p=0.004), protrusion (p=0.004), balancing side (p=0.001) and max S of the native joint and endoprosthesis when opening (p=0.009), working side (p=0.008) and balancing side (p=0.001). A decrease in indicators was observed in the Start/end of the native joint when opening (p=0.035), protrusion (p=0.02), working side (p=0.004), as well as the endoprosthesis relative to the pathological joint when opening (p=0.028), protrusion (p=0.001) and balancing side (p=0.003). In the present study, in all cases, a slight but clearly defined translational shift on the side of the intervention was detected on the control condylograms, which can be referred to as «pseudotranslation».