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Recording the mandibular movement of young children has been one of the difficult work in pedodontics. This is mainly because the recording equipment used so far are too much of a burden on the children to provide sufficient cooperation which the researchers require. A specially designed pedodontic mandibular movement recorder (PMMR) is presented in this paper, which three-dimensionally detects the position detectors fixed perpendicular to the sagittal and frontal planes. The PMMR has the following advantages: 1) The light position detector used is small, light in weight and of high accuracy. 2) By means of simple adaptors the light position detector can be fixed stereotaxically to the skull with little change, which may be caused by the movement of the children's head during the jaw movement. Thus, the data obtained by the PMMR are highly reproducible and easily normalized. 3) Because of the small size and light weight, the PMMR does not restrain the subjects' head movement during the measurement and makes the children cooperative by decreasing the burden on them both physically and mentally.At the same time, it makes it easier for the clinician to examine the mandibular movement of the children at chair-side. These advantages demonstrate the PMMR as an equipment suitable for recording the various types of mandibular movement in the young children, including the border movement and the masticatory movement.

Three-dimensional recording apparatus (PMMR) of mandibular movement of young children using light position detector.