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Science of Computerized Mandibular Scanning (CMS) – Jaw Tracking


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Advanced Techniques for Precision and Accuracy – Computerized Mandibular Scanning

Computerized mandibular scanning (CMS) or “jaw tracking” was invented by Dr. Bernard Jankelson and further developed and perfected by his son Dr. Robert R. Jankelson in 1971. Low frequency Myomonitor TENS (transcutaneous electro stimulation) was first developed by Dr. Jankelson senior in 1964 in conjunction with Myotronics/ Normed, Inc. Tukwila, Washington.

The use of computerized electro-diagnostics is a more sophisticated approach to accurately and objectively define and treat TMJ/ TMD. A variety of techniques have been developed to diagnose TMJ diseases and disorders including mandibular jaw tracking (1971), surface electromyography (1980) and electrosonography (1987). In the past these technologies were not available, thus resulting in erroneous conclusion, misdiagnosis, and misguided treatments.  Today, accuracy and precision is key and of great significance to the discerning and astute electro-diagnostically oriented clinician.

Computerized Mandibular Scanning (CMS)

Computerized Mandibular Scanning is a more complex assessment of mandibular function using biomedical instrumentation which measures the rotational movement in the frontal and sagittal planes thus confirming a neuromuscular dysfunction. The computerized mandibular scanner measures jaw movement (both qualitatively and quantitatively in several dimensions) to within 0.1 millimeters of accuracy. With a magnetic tracking device and sensor array, it projects the data on a calibrated computer monitor.

The CMS measures jaw movement is far more accurate than the eye, making it possible to document characteristics of mandibular motion considered significant to evaluate jaw function. It also identifies the amount of free space, the swallowing pattern, and the quality of the occlusion, and substantiates the presence of disc derangements and their prognosis for reduction. It is a multi-dimensional assessment of torquing movements used to differentiate between contributing factors of a pathologic position to a non-pathologic position on opening and closing of the mandible. It is used in conjunction with EMG recordings.

Graphic recording of opening/ closing paths of jaw movements from the side and front views can be analysed to assess abnormal mandibular paths of movement. The speed at which the jaw can open and close is also simultaneously recorded.

The literature supports the efficacy of mandibular tracking in the diagnosis and treatment of TMD.

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