Assess correlation between subgingival plaque and loss of attachment in JP patients. 27 teeth (incisors and first molars) were extracted from 16 patients with periodontitis. Ages: 12-22.
Teeth were grooved at the gingival margin and after extraction they were stained with toludine blue. Loss of attachment was measured as the distance between the CEJ and the remnants of periodontal fibers on the central part of the 4 surfaces. Two measurements were made of the distance from the plaque to the periodontal fibers; one at the point nearest to the apex and one nearest to the CEJ in areas of attachment loss.
Subgingival plaque was very thin (less than 1/4 of a mm). On most of the teeth plaque appeared to be totally uncalcified. Attachment loss was greater on M & D surfaces than B or L. Furcation involvement was found in all the molars. The highest speed of apical growth of the subgingival plaque was estimated to be about 1.8 mm /year and this was probably related to the high invasiveness of the plaque and defects in the host defense mechanism. Proposed the term "destructive juvenile periodontitis" instead of periodontosis.
Note: If apical growth of subgingival plaque is 1.8 mm /year that means that affected tooth will be loss in less than 10 years.
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