The measurement of mandibular movement permits a subjectspecific dynamic analysis (1) and is useful for the diagnosis of oral disorders and for designing the functional occlusal surfaces of dental prostheses (2). Furthermore, mandibular movement data can be utilized to evaluate the outcomes between before and after prosthodontic treatments and can be critical to predict the prognosis of oral rehabilitation (3, 4). A threedimensional (3D) mandibular movement device is ideal for tracking the condylar and incisal inclination movements. These devices include the magnetometry (Mandibular kinesiograph) and optoelectronic tracking systems (Sirognathograph) (5, 6) , and the Gnathohexagraph (Gnathohexagraph III, JM-2000, GC, Tokyo, Japan) , which is an optoelectronic jawtracking system with 6 degrees of freedom. These devices can measure mandibular movements during mastication using cameras to track the spatial position of lightemitting diodes (7). However, these devices are often not available in clinics because of its high cost in general, (8) , and complex to handle in daily clinical practice. Therefore, a simple, acceptable, and reliable device to measure mandibular movement is needed by clinicians. The anterior deprogramming device (ADD) , also known as the Lucia Jig, comprises an individually fabricated anterior guide table, which allows for mandibular Correspondence to:
Visualizing mandibular movement is essential for evaluating the treatment outcomes before and after prosthodontic intervention. It is also critical for predicting prognosis before treatment (1) (2). A threedimensional (3D) mandibular movement device is ideal for tracking condylar movement and incisal inclination. In general, the 3D device tracks mandibular movement using magnetometry (mandibular kinesiograph) and optoelectronic systems (sirognathograph) (3) (4). These devices can measure the mandibular movements during mastication using cameras that track the spatial position of the lightemitting diodes (5). The Gnatho-Hexagraph III (GH) (GC Corporation, Tokyo Japan) is also a 3D device. However, these devices are generally expensive, complicated for use in daily clinical practice, and are therefore, often irrelevant in the clinical setting (6). However, a simple and reliable device for measuring mandibular movement may be suitable as a clinical screening tool. In general, "screening" is the presumptive identification of unrecognized disease or defect with tests, examinations, or other procedures. A screening test identifies the individuals at risk of having a particular condition, so that they can be referred to a specialist (7) .
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