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Studying of influence of periodontal disease on vitality of pulp, the response thresholds of 421 teeth (250 normal teeth, 171 periodontal diseased teeth) were examined electronically by means of an automatic pulptester. (ANALYTIC TECHNOLOGY CO.) The pulp tester values of three experiments were averaged. The average value of normal teeth was 36.3 and that of periodontal diseased teeth 31.4. The response thresholds of periodontal diseased teeth were lower than those of normal teeth. This indicated that pulp was inflamed by periodontal disease and pulp vitality became weak.
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