No abstract

The Pantographic Reproducibility Index (PRI) has been developed to evaluate mandibular dysfunction through the reproducibility of lateral border movements. There exist no data on the Japanese population regarding PRI. The purpose of this study is to determine the normal range of PRI in normal subjects. Those data will be compared to the patient data and an evaluation of the treatment outcome. Ten male and ten female Japanese who reported no signs and symptoms of Craniomandiubular Disorders were used in this study.1. The average PRI in males was 6.95 (5.93).In females the average was 7.30 (4.45). There was no statistical difference between sexes.2. One male subject showed a PRI at 25 and was classified to the slight dysfunction category suggested by Clayton where as other 19 subjects were classified as normal.3. Within the 24 divided section, the largest PR value was 2 and average varies from 0.03 (saggittal orbiting path early part) to 0.58 (saggittal rotating path later part).

The change of the reproducibility of maximum border movements in patients with CMD has been studied in the Untited States. Clayton and others reported a change of PRI, pantographic reproducibility index.There is no information on this in the Japanese population. Also, there is found no study on each section of a scribed line, pantographic reproducibility value (PRV). The purpose of this study is to analyze each section's characteristics with a Japanese population. 30 craniomandibular disorder patients were used in study. The Denar pneumatic pantograph has used. The average PRI before treatment was 35.5 and after treatment was 14.8 Statistically significant correlation (r=0.56) was found in PRI between before and after treatment All 12 sections showed a stasistically significant difference in PR value between before and after treatment Sensitive

In this study, 7 intraoral sites were analyzed. The results were compared with previous studies (high to low).1. The order of pain was: 1. Lateral pterygoid muscle 2. Medial pterygoid muscle 3. Posterior part of tongue and Anterior belli of digastrics 5. Temporalis insertion and middle part of tongue 7. Anterior part of tongue. This order was constant before and after the splint therapy.2. Intraoral sites showed significantly higher tenderness compared to corresponding intraoral sites. Temporalis showed 2.29 times or more in before treatment and 10.85 times or more after treatment. Medial pterygoid shows 1.47 times higher before and 5.32 times higher after treatment. Anterior belli of digastrics shows 1.34 times higher before and 2.49 times higher after treatment to the Posterior Belli of digastrics.

Digital palpation has been used to evaluate patients with craniomandibular disorders. Tenderness at each site is classified on a 0 to 3 scale and evaluated as total summation. Tendernes were ranked on the scale.Nonparametric statistics were applied to analyze these data. 34 kind 64 sites makes 192 steps in total summation. Increase of step yielded similer results in parametric and nonparametric statistics. The purpose of this study is to clarify the difference in results between non parametric and parametric statistics. 100 female CMD patient data were used to make group of 13,25,50 and 100 subject group. 16 kind 30 sites, 23 kind 44 sites and 34 kind 64 sites were anlysed as summation. The Wilcoxon test and t-test were used to analyse before and after treatment data. The Spearman's correlation coefficient and Pearson's correlation coefficient were analyzed. In the probability, nonparametric statistics always showed more conservative result than parametric statistics.Discrepancy between nonparametric and parametric statistics decreased with an increase of the number of subjects. With 50 subjects, the maximum discrepancy was 0.0011. Discrepancy between correlation also decreased with an increase of the number of subjects. With 50 subjects, the maximum discrepancy was 0.0095. There found very little difference if the number of subjects is more than 50.