## 1 Introduction  
For a complete understanding of the kinesiology of the mandible, it is necessary to record muscle activity and movement pattern simultaneously as a strategy to relate the phases of chewing cycles to muscular contractions [1]. Neuromuscular analyses involving surface electromyography (SEMG) of the masticatory muscles and kinematics of the mandible have been widely employed in clinical practice and research. These techniques allow quantification of disharmony in pathological conditions as well as the outcome of given therapies [2]. Some studies involved simultaneous recordings of both kinds of signals [1, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18] but only a few achieve synchronization [1, 3, 4, 5, 15]. To synchronize signals from different acquisition systems is a challenging task, and the methodology employed by researchers is not always clearly reported.  
Current advances in technology have allowed dentists precise methods to evaluate mandibular movements (MM) and muscle activity. Surface EMG is a non-invasive technique that provides information on muscle properties through electrodes located over the skin. The surface EMG is the sum of the electrical contributions of the active motor units and reflects both the muscle membrane properties and the central control strategies [19]. Many researchers apply surface EMG recordings in both basic research and clinical studies [20]. In controlled experimental conditions, surface EMG has been shown to be a powerful tool to study the jaw elevator muscles physiology and muscle impairments associated with different temporomandibular disorders (TMD), and also to detect muscle hyper- and hypo-activity, muscle imbalance, rest position, and fatigue [20].  
Electromagnetic articulography (EMA) is a non-invasive technique that can be employed to analyze kinematics of the mandible [21]. It is based on the inductive measurement of distances, originally introduced to track the movement of articulators such as the tongue and lips during speech production [22]. EMA systems generate an alternating magnetic field of controlled frequency in the measurement area by the implementation of transmitter coils [22; 23; 24]. The magnetic field induces an alternating electric current in small receiver coils, which are also called sensors [22]. The induced current is analyzed to calculate the spatial position of the sensors [22]. [PERSON] et al. employed the AG501 articulograph to assess cinematic characteristics of masticatory cycles in healthy participants with normal occlusion, tracking the position of an EMA sensor placed in the interincisal midline of the mandible [25; 26; 27; 28; 29]. [PERSON] et al. employed the Wave articulograph to analyse the micro-movement of dental prosthesis during mastication [30]. Compared with other methods employed to track MM, EMA systems allow more natural movements because they do not restrict the movement of body--including the head--and also achieves high spatial precision (up to 0.3 mm) and temporal precision (sample frequency of up to 1 kHz) [25; 26; 31].  
Fusing electromagnetic articulography with surface electromyography provides new opportunities to analyze the biomechanics of the mandible. Our goal is to propose and establish the proof-of-concept of an approach to synchronize a 3D electromagnetic articulograph with a surface electromyograph based on the standard components of the equipment, showing that there is no significant interference between the systems.