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허성주,김광남,장익태,Heo, Seong-Joo,Kim, Kwang-Nam,Chang, Ik-Tae 대한치과보철학회 1994 대한치과보철학회지 Vol.32 No.1
The purpose of this study was to evaluate the mandibular movements of TMD patients comparing to normal persons. Sirognathograph was used to measure five parameters of mandibular movements of twenty normal persons and eight TMD patients. Five parameters were (1) Maximum opening during maximum opening and closing, (2) Mean velocity during maximum opening and closing, (3) Maximum opening during unilateral chewing, (4) Mean velocity during unilateral chewing, (5) Consistency of mandibular movement during unilateral chewing. Based on above results, new Mandibular Movement Index(M.M.I.) was formulated and compared to Helkimo's Clinical Dysfunction Index by measuring two indices before treatment and 2 weeks, 4 weeks, 6 weeks, 8 weeks after treatment. The conclusions were as follows: 1, The amounts of maximum opening and mean velocity during maximum opening and closing of TMD patients were less than those of normal persons(p<0.01). 2. The amounts of maximum opening and mean velocity during unilateral chewing of TMD patients were less than those of normal persons(p<0.05) (P<0.01). 3. Although TMD patients showed limited mandibular movements during unilateral chewing, the consistency of mandibular movements was better than that of normal persons(p<0.05). 4. Both mandibular movement index and Helkimo's Clinical Dysfunction Index, were useful in diagnosing TMD patients.
허성주 대한두개하악장애학회 1995 대한두개하악장애학회지 Vol.7 No.1
The important causes of tooth wear were abrasion, erosion and attrition. Although there were occlusal wear in all persons, the severity of tooth wear were very different from person to person and area to area. The tooth contact patterns during chewing could be related with occlusal wear. There were two types of chewing patterns. One was chopping chewing pattern like carnivorous animal and the other was grinding chewing pattern like hernivorous animal. The purpose of this research was to study the relationship among tooth wear, chewing patterns and incisal guidances. 90 dental student, who had normal mandibular movements, normal chewing function and no occlusal restorations, had recording of chewing movements with Sapon Visitrainer. 12 students of chopping chewing group and 12 students of grinding chewing group were selected. Alginate impression were taken and stone model of each student were made. Ordinal scale was used to evaluate the degree of tooth wear for chopping chewing group and grinding chewing group. Incisal guidances of each student were measured and compared to chewing pattern and tooth wear. t-test was to used to evaluate the differnece of tooth wear between two groups. The correlation between incisal guidance and tooth wear was statisticaly evaluated with SPSS. The conclusions were following ; 1. The anterior teeth showed greater tooth wear than posteriror teeth in both groups.(P<0.01). 2. The chopping chewing group showed less tooth wear in anterior teeth, upper teeth, lower teeth, and all teeth than grinding chewing group. (P<0.05) 3. Incisal guidance of the chopping chewing group were not different from that of the grinding chewing group.(P>0.05) 4. The incisal guidance was not statistically related with tooth wear.(P>0.05)