[Diffusion of hydroxyl ions from calcium hydroxide in the dentinal tubules]. / Etude de la diffusion des ions OH- de l'hydroxyde de calcium dans les tubuli dentinaires.

The aim of this study was to compare hydroxyl ions diffusion from various calcium hydroxide forms: Hycal (1), Roeko points (2) and aqueous suspension placed in the pulpar chamber (3) or in the root canal (4). These experiments were conducted with bovine incisors in order to obtain quantitative evaluation. 540 lateral cavities, deep and superficial, were created in root dentin to measure the hydroxyl ions diffusion with a color indicator, the Blue epsilon With Hycal and aqueous suspension the diffusion of the OH- is obtained in the superficial cavities situated in the coronal part at 14 days (1 = 72%; 3 = 44%; 4 = 100%, (n=18)). In the apical part of the canal this phenomenon is never complete at 21 days (1 = 17%; 3 = 22%; 4 = 17%, (n=18)). No diffusion was observed with the Roeko points (the first generation).

[Enamel asiderosis and dental caries]. / Asiderose amelaire et carie dentaire.

This study investigated the effect of the Stephan 580 cariogenic diet on the iron containing enamel in rat teeth. Forty Wistar rats (male and female) weighing 120 g, were given the Stephan 580 cariogenic diet for 21 days and compared to another similar group of forty rats weighing 120 g, given the normal A03 non cariogenic diet. The results of Energy Dispersive x-ray Analysis for iron showed a lack of detection of iron in the carious enamel of rats fed with the Stephan 580 cariogenic diet. Iron was found only in the non-carious enamel of control rats. The Stephan 580 cariogenic diet induced enamel asiderosis in rat teeth.