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Biomedical subjects

R de A Cruz

Publications and source records attributed to R de A Cruz.

9 recordsLinked to original sources
PubMed1993

Topical application of fluorides on teeth. New concepts of mechanisms of interaction.

Prevention of caries in exposed root surfaces constitutes an important clinical problem. It is thus important that clinicians involved with periodontology have an insight into fluoride prophylaxis. The understanding of the cariostatic mechanism of fluoride has improved during recent years. The aim of the present review is to give a short account of the present concept. Calcium fluoride appears to be the only product which is formed on enamel, dentin or cementum during brief topical treatments with fluoride or use of toothpaste containing fluoride. This calcium fluoride is stable in the oral environment; this is contrary to what was believed until recently. The calcium fluoride constitutes a pH-dependent reservoir of fluoride which releases fluoride when pH drops. The practical consequences of this concept is discussed.

Calcium Fluoride↗
PubMed1977

[The influence of the quality of proteins in fluoride bone fixation].

45 rats Wistar, 30 days old, were divided into five groups, receiving different diets: casein, bean and wheat flour. The last two diets were supplemented or not by D-L Methionine and D-L Lysine, respectively. Diets and fluoridated water (25 ppm) were given "ad libitum" for 28 days. After this period of experience, the animals were sacrificed and the mandible and the tibias removed for analyses of fluoride, calcium, phosphorus and ash. The A.A. main conclusions are the following: The fixation of fluorides in bones is significantly increased with the supplement of the limitant factor to dificients diets. In this condition, the mandible shows smaller fixation of fluorides than tibias. The level of calcium, phosphorus and ash shows to be similar in the diferentes groups. This data suggests interaction of the protein quality and the percentual fixation of fluorides, and the necessity of further studies about this problem.

Animals↗