The aim of this study was to investigate the geographic variation in mortality indicators in Songjiang District of Shanghai under rapid change with urbanization. Geographic Information System (GIS) was used to visualize the distributions of health status and to test the extent of spatial auto-correlation in the indictors. In 2001, total crude mortality was 687/100,000 for the district; the rates for the townships (N=15) in the district ranged from 444/100,000 to 805/100,000. GIS maps indicated that the mortality was higher in the marginal areas of the district. Significant positive auto-correlations were found in total crude mortality rates, death rate for infectious diseases, and death rates for digestive diseases. The measures that consider intra-region inequality in health needs will be required in the regions under urbanization.

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The purpose of this study was to investigate a suitable occlusal height for an implant prosthesis by examining the responses of the periodontal tissues around a natural antagonist. The subjects were three Japanese females with two posterior missing teeth restored by ITI system implants (Straumann). Two kinds of experimental implant prostheses were adjusted as follows; one was adjusted in heavy clenching (HC), and the other was adjusted in light clenching (LC). The periodontal pulsation, displacement during biting an occlusal force meter and the mobility of the antagonist were measured before and one week after temporary cementing HC and LC, and one week after removal. In each prosthesis, there was no significant difference in the amounts of the pulsation and mobility of the antagonist before and one week after cementing, and one week after removal (p>0.05). The displacement of the antagonist during biting the occlusal force meter did not change much during the conditions. The results of this study suggested that an implant prosthesis adjusted not only under heavy clenching but light clenching like crown restorations for natural teeth did not affect the periodontal tissues of the antagonist in a harmful manner.

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The purpose of this study was to investigate occlusal pressure patterns of complete denture wearers to evaluate progress of occlusal adjustment of dentures. Thirty three edentulous subjects volunteered to participate in this study. A computer- based device was used to measure occlusal pressure sequence while tapping with their new dentures. The following variables obtained from each occlusal pressure pattern were assessed: Peak Time; Duration from the onset of pressure to the maximum pressure, Unloading Time; Duration from the maximum pressure to the end of pressure, Contacting Duration; Duration from the onset of pressure to the end of pressure, Tapping Cycle; Duration from the onset of pressure to the next onset, Peak Ratio; ratio of Peak Time to Unloading Time. Recordings were performed after the occlusal adjustment at each appointment and continued until denture adjustments were completed. Variables were analyzed using ANOVA and Bonferroni. A significant decrease was seen in Peak Ratio as the occlusal adjustments progressed (p<0.05). Its coefficient of variation was constantly the lowest among variables. The coefficient of variation of Peak Ratio was significantly lower than others at the completion of the adjustment (p<0.05). It was suggested that Peak Ratio was useful for evaluation of occlusal adjustment.

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