Francisco V. Dominguez

Myxoma of the jaws

Abstract A series of twenty-one primitive myxomas of the jaw, twelve of which were of central location, has been studied. The roentgenologic, macroscopic, microscopic, and clinical data are compared with the information obtained from ninety-five cases published in the literature. Myxoma of the jaw, in our experience, is a tumor found fairly frequently, the average age of the patient being 33 years. It is found more often in the female subject and in the lower jaw. The evolution differed in each case, but, in those cases in which the tumor was not widely resected, it tended to recur.

Tissue response to a glass ionomer used as an endodontic cement: A preliminary study in dogs

A glass ionomer and a standard zinc phosphate were compared with respect to their biocompatibility as endodontic cements. The tissue response was assessed by implantation of both materials in dog tibias. In general, the glass ionomer appeared to provoke a slightly lesser inflammatory response than the zinc phosphate, but this was significant only at the 10- and 30-day observations. At the end of 90 days the tissue response to the tested materials appeared to be similar and the inflammatory picture tended to be resolved with progressive new bone formation. These findings suggest that the tested glass ionomer might adequately replace the zinc phosphate cement as a luting material for endodontic implant stabilizers.

Focal epithelial hyperplasia: Report of five new cases from Argentina

Five cases of focal epithelial hyperplasia in Argentina from 1968 to 1974 are reported. There was an age range from 11 to 27 years, with an average of 18 years. Three of the patients were born in Jujuy in the northwest corner of the country. Two of these cases were observed in an epidemiologic study carried out among 8,895 20-year-old Argentine men from different areas.

Silver accumulations in periapical granulomas: Report of five cases using the scanning electron microscope, the electron microprobe, and other complementary methods☆

A series of cytologic imprints obtained from periapical granulomas were studied with the conventional light microscope, the scanning electron microscope, and the electron microprobe to analyze the chemical composition of several black deposits that were randomly observed near or in the cytoplasm of macrophages and multinucleated giant cells. These granulomas had been removed from endodontically treated human teeth in which the root canals had been obturated with silver cones and Grossmans sealer 3 to 5 years previously. To investigate whether corrosion had occurred on the silver cones, the cones were also examined with the scanning electron microscope and the electron microprobe. Our observations revealed that all the examined silver cones showed different degrees of corrosion on their surfaces, whereas different concentrations of silver, sulfur, and chlorine were detected at the same sites in the cytologic imprints. However, it is impossible to determine from this study whether the presence of corrosive by-products in the periapical tissues is responsible for the development of a pathologic reaction at these sites.

The formocresol technique in young permanent teeth. A histopathologic study.

Twenty-six extractions were performed at random among seventy-six young, permanent teeth, treated by the formocresol technique, between 5 and 20 months after treatment: twenty-one with penetrating caries (nine vital and twelve nonvital) and five healthy. As a control group, thirteen permanent teeth with penetrating caries were removed: seven vital and six nonvital. The histopathologic analysis compared pretreatment and posttreatment radiographic examinations. In the control cases, there was almost always inflammation and/or necrosis in the entire root canal. In the experimental cases, fibrosis and osteodentin predominated in the apical third, diminishing gradually near the cervical third. Inflammation and necrosis, very low in the apical third, increased similarly near the cervical third. This response seems to be a stage in a process of evolution in biologic scar healing. The complete cure must require a greater lapse of time than that of this experiment--around 10 to 12 months.