An observation and evaluation of the reproducibility of the mandibular movements has been a integral part of j test for mandibular function and dysfunction. After Pantographic Reproducibility Index(PRI) was introduced tr - dentistry, many authors have used the index for investigation of mandibular movement function, especially incompartment. However, the difficult and time-consuming work of instrumentation for getting the PRI has beers major obstacle -in using -pantograph. This study was performed´ to try a new mandibular .reproduciibility index, so-called.BioEGN reproducibility index(BERI), calculated from- mandibular trajectory recorded with BioEGN,
?6 dental students without any signs and symptoms of to poromandibular disorders and 22 patients temporomandibular disorders took part in this study and classed to control group and patients group, respecdvdpPantronic and -BioEGN were used to record and calculate the indices, PRI and BERL PRI had only one value, ba BERI had two values of outgoing and incoming movement in each scale. With two scales of small and large, as a result, BERI had four values in this study. PRI corresponded to BERI in small scale on outgoing total movements
The data were calculated and analyzed with SAS/stat program and the conclusion of this study were as follows´
1. In every scales, in each movement, BERI on outgoing movement in control group was lower than that in patients group, respectively, but BERT on incoming movement was only different in one side movement, that was, left excursion.
a The difference between BERT on outgoing movement and BERI on incoming movement was only shown in small scale on total movements, not in each movement, in control group. However, there was generally a positive correlationship between BERI on outgoing movement and BERI on incoming movement in each movement in both groups.
3. Simple statistics of PRI was similar to that of BERI on total movements in small scale, but there was a negative correlation between PHI and BERI on total movements in large scale only in patients group.
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