Development and clinical use of measurement system of mandibular bone density without using X-ray

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The vibration analyzing system of the bone is used for the research purpose of screening osteoporosis. The purpose of this study was to apply this system to the mandible and fabricate the measurement system of mandibular bone density without using X-ray and check its possibility for the clinical use.Vibration of the mandible was produced through the procedures of setting the chin on the pick up sensor and hit the forehead by the hammer antomatically. The constant frequency (fc) was converted as a hardness of the bone, and the maturity and inner structures of the mandible were predicted. The data taking, frequency analysis and the calculation of the fc were automatically carried out by the hand-held FFT analyzer and the personal computer. The relationship between the growth indicators such as a body height, body weight, value of bone mineral density and the shape of the mandible, etc.and the fc of the mandible were evaluated.The results were as follows :1)The fc did not show the significant relationship with a body height and weight.2)The significant relationship was found between the fc and bone mineral density of the wrist bone.3)The size of the mandible, especially the ramus height, anterior alveolar height and the thickness of the symphysis showed the significance according to the cephalometric evaluation.4)The fc demonstrated the tendency that was higher at the Skeletal Class III and a short face.The results suggest that the parameters measured by this system might be used as the new indicators to evaluate the shape of the mandible and quality of the mandibular bone. This would lead the applications such as the evaluation of bone maturity, the indicators to predict the growth potentiality, healing procedure through the orthognathic surgery, the anchorage value for the teeth movement in orthodontic treatment.