Effects of citric acid on diseased root surfaces

Abstract

The effect of topically applied citric acid on periodontally diseased root surfaces was evaluated using the scanning (SEM) and transmission (TEM) electron microscopes. Results with the SEM indicate that acid application had no effect on specimens that had not been root planed. After application to root planed surfaces, however, the acid priduced a fiber‐like surface with frequent depressions. TEM observations showed that the acid application produced a four micron wide demineralized zone, which was characterized by exposed collagen fibrils. These fibrils seemed to be continuous between the mineralized and demineralized zones of the root. It appears that the relative success of the citric acid application in periodontal reattachment procedures is realted to the fact that the acid causes exposure of collagen fibrils in the dentin matrix, thus providing a suitable nidus for splicing with new fibrils during the healing process.

Demineralizing Agents Versus Er: Yag Laser Irradiation Effect on Root Surface Demineralization:a Scanning Electron Microscopic Study.

“…Tubule orifices were regular in shape, being funnel shaped, indicating better smear layer removal properties. These findings were similar to those obtained by Garett et al, [32] Polson AM et al [33] The findings obtained in this study in tetracycline group were consistent with Soares PBFet al [34] who showed that the dentinal tubules were completely covered by Tetracycline residues and failed to effectively remove the smear layerand Fontanari LA et al [35] who showed Tetracycline had a poor capacity to remove smear layer. In this study, majority of the specimens showed evidence of exposure of collagen fibres which were consistent to findings of Nadir Babay et al [25] Although lasers were not very effective in root surface smear layer and opening of the smear layer in our study, it did cause irregularities on the root surface.…”

Bacterial Adsorption to Fetuin and Mucin Pellicle.

“…This structural relationship is of interest because collagen is a major component of the matrices Department of Bacteriology, Nihon University School of Dentistry To whom all correspondence should be addressed: Dr. Yasuyuki Hirano, Department of Bacteriology, Nihon University School of Dentistry, 1-8-13 Kanda-Surugadai, Chiyoda-ku, Tokyo 101, JAPAN. of cementum and dentin, and collagen fibers become exposed when these tissues are subjected to acids produced by oral bacteria [22,23]. The purpose of the present investigation was to devise a new bacterial adhesion assay system for use in elucidating bacterial adhesion mechanisms.…”

Efeitos do condicionamento ácido na descontaminação da superfície radicular e no recobrimento radicular: análise em MEV e estudo clínico randomizado

“…Apresenta ação desmineralizante da superfície dentinária, observando-se que a aplicação por 1 minuto resulta em desmineralização superficial de 4.5 µm de profundidade (HÉRITIER et al, 1984), compatível com aquela sugerida por Garret et al (1978) e Ririe et al (1980) após o uso de ácido cítrico pH 1.0 durante 3 minutos.…”