The Measurement of Tooth Displacement under Small Loading on Experimental Periodontitis in Dogs

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  • 実験的歯周病罹患歯の微小荷重に対する変位動態

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Abstract

The main purpose of the present study was to compare tooth displacement under small loading between the same teeth in healthy state and in experimental periodontitis. Five mongrel dogs served as the subjects. High accuracy laser displacement transducer was used in this study. At all tested sites, probing depth (PD), clinical attachment level (CAL), gingival crevicular fuluid (GCF) and tooth mobility (Periotest value) were recorded. The tooth displacement was studied by using 1-100g of vertical loading. Each load was suddenly applied, maintained for 30 seconds, and then suddenly removed. The experimental tooth was unloaded for 5 minutes before the application of a further load. The time between each sampling was set as 0.05 second. The results obtained were as follows : 1. The two-stage intrusion pattern was observed in experimental periodontitis teeth, as shown in healthy teeth. 2. In experimental teeth the two-stage tooth displacement was observed from 1g of loading which was not observed in healthy tooth. 3. The tooth displacement distance both in 1st-stage and 2nd-stage significantly increased on tooth which was affected with periodontitis. 4. A significant correlation was observed between intrusion distance of phase1 (loading of 10-50g) and tooth mobility. The change in mobility of tooth displacement may have the possible role in pathological tooth movement which was observed in severe periodotits.

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