A three-dimensional study of mandibular rest position in young children

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Using a functional method based on the principle of the"Amplitude-Histogram", the method that divides the electric potential curve of an analog signal into a clock-time, converts a division into digital data and then makes a histogram, we determined the mandibular rest position of a young child in the primary dentition stage and examined age-related three-dimensional changes in this position.The purpose of this study was to obtain new information to help us understand the maturation of the neuromusculature through changes in the mandibular rest position.The subjects were 18 children (6 three-year-olds, 6 four-year-olds and 6 five-year-olds) with normal occlusion.The results were as follows:<BR>1. Vertical component: The mean values of the freeway spaces decreased with age and the rest positions approached the centric occlusion. Also they scattered vertically have converged.<BR>2. Lateral component: The rest positions were scattered around the median line in three-year-old children, but they have converged at the median line with age.<BR>3. Anteroposterior component: The rest positions were scattered anteroposteriorly in three-year-old children, but they have converged below the centric occlusion with age.
日本顎口腔機能学会の論文