| Abstrakt: |
Material from 20 young rhesus monkeys was prepared for study of the interdental gingival epithelium. An additional four young monkeys were injected with tritiated thymidine and radio-autographs prepared for-analysis of cell turnover. It was found that the interdental gingiva between recently erupted teeth in proximal contact has a col form. The appearance of the col can be simulated by vertical sections close to the roots of single teeth. Analysis of section through the actual col showed that it is always lined by squamous epithelium, five, or more cell-layers thick, without any recognizable ameloblasts. The radioautographs showed consistent evidence of thymidine uptake, indicating cell-division, in all epithelia lining the col. It was concluded that the histoIogical features and turnover-rate of epithelium in the interdental region are closely-analogous to those of epithelium on other aspects of the teeth. Clinical studies of the presence and amount plaque and gingivitis in 1,075 intact interdental areas in 48 young adults showed a high degree of correlation between the presence and amount of plaque and the presence and severity of gingivitis, and ten support to the hypothesis that gingivitis starts interdentally because plaque accumulates there. [ABSTRACT FROM AUTHOR] |
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