This was a study of the clinical characteristics of Odontomas (benign odontogenic tumors) discovered at the Barros Luco-Trudeau Hospital between the years 1976 and 1983 by means of the statistical method. The data which was compiled was tabulated and the values expressed as ratios. The results were compared with those published by other investigators thus showing the differences and similarities with the analyzed sample.
An in vitro study about the influence of temperature on the solubility of deciduous powdered enamel protected by sodium fluoride (0.05%) was made to observe the variation of the weight loss when the tissue was exposed to 0.5 N lactate buffer at pH 4.5. The protective capacity of fluoride to decrease the acid solubility in temporary tooth enamel presumably can be attribute to increase the temperature measured by scale centrigrade.
We studied the adsorption of sodium fluoride, ammonium fluoride, tin fluoride and sodium monofluorophosphate to synthetic hydroxiapatite in function of the pH (pH 4.7, 5.5 and 6.1). In two models; in a first model was eluted the fluorides of the hydroxiapatite column with artificial saliva; in the second model were incubated the fluoride with bufferized hydroxiapatite to the above pH. The fluoride determination was done by potentiometric method with a specific ion activity electrode. The results in the elution indicated that the sodium and tin fluorides give elution levels different at the pH studied. By other hand ammonium fluoride did not present differences. The results with incubation demonstrated that ammonium fluoride gives the greater adsorption, the sodium fluoride is slightly lower, and the sodium monofluorophosphate the lowest. Also, was observed that the adsorption decrease with the increase of the pH for the three fluorides. The comparison of both models showed that the incubation presented higher values of adsorption than the elution for the pH studied.
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