Abstract
Considering that there would be some relation between progress of pyorrhea alveolaris and vitality of parodontium, we studied on katalase, one of the necessary ferments to human body, in pyorrheal gingiva. The results were as follows.
1) Katalase activity of pyorrheal gingiva was less than 2/3 of normal gingiva.
2) Stronger the inflammation or deeper the gingival pocket, less the katalase activity.
It seemed that katalase activity of pyorrheal gingiva was inversely proportional to the progress of pyorrheal condition.
