[A weight and surface analysis of glass ionomer cements in the presence of acid solutions]. / Analisi ponderale e della superficie di cementi vetroionomerici in presenza di soluzioni acide.

The surface and solubility of some glass ionomer cements have been assessed after exposure to four acids (acetic, formic, lactic and propionic), that are usually present in the bacterial plaque. Therefore, we prepared 80 samples--20 for earl of 4 commercial products; after 7 days and, then after 30 other days, the samples were examined by microscope and weighed. Finally, those showing the most significant modifications were photographed.

[Linear and volumetric calculations of the free gingiva on deciduous and permanent teeth]. / Computi lineari e volumetrici della gengiva libera, in denti decidui e permanenti.

The authors expose the results of an analysis made by measurements and volumetric calculations, of deciduous and permanent teeth, estimated at the level of the cementum-enamel junction and of the circumferences passing through the points of the occlusal and apical maximum convexity of the junction itself. It may be useful to remember free gingiva is that part of gingival sulcus included between the gingival margin and the bottom of sulcus, it is a tridimensional structure, having triangular section, where the gingival sulcus depth is the height and the thickness at the bottom of gingival sulcus is the base of the triangle. These measurements can be useful to examine closely the analysis of periodontal physiopathology.