Revista de la Facultad de Odontologia最新文献

It is work out and discuss one of the principal problems in the laser therapy use during the TMJ dysfunction treatment: the determination of the application points for the soft-laser stay, detailing the position of some of them that are essentials to obtain the objectives of this type of treatment.

Evolutionary, structural, ultrastructural and cytochemical studies (PAS, alcian blue, toluidine blue, Ruthenium red) were performed in chick tongues 7 to 19 days development, with the aim of observing the histomorphological changes during growth and differentiation. At 7 days the tongue was covered by a flat epithelium without cornification, with four cell lines. As an axis was observed a central hyaline-cartilaginous skeleton surrounded by mesenchyma. Since 11 days appeared glandular buds and canalized cell cords united trough complexes. At 15 days the epithelial thickness increased remarkably. The subepithelial connective tissue, already notably differentiated, formed papillae. Glandular acini contained PAS positive, alcianophilic, metachromatic and positive ruthenium red substance. Ultrastructurally, glands showed clear cells, with decreased electronic density and organoids randomly distributed and dark cells having electrodense cytoplasm and more organized organoids. At 19 days the epithelium was cornified in the tongue anterior half. A net increment of glycoconjugates was detected in glands. These observations show: 1) lingual glands secrete mucins since 15 days of embryonic development; 2) the cornified anterior epithelium is the result of a genetic pattern and not of a later functional adaptation to the type of feeding (grain eating birds).

The object of this work was to establish whether induced stress leads to morphological changes in the sublingual and submaxillary glands of rats. General adaptation syndrome (S.G.A.) was induced in 25 young adult male Wistar rats through cold and immobilization. The animals were killed 48 hrs. and 10 days after stressor (E.A.) application. To verify stress condition, the adrenales were weighed and plasmatic corticosterone were carried out. The sublingual and submaxillary glands were dissected, fixed in buffered formol and stained with H.E. The results histology indicate that the submaxillary is more sensitive to cold than the sublingual, while the reverse holds true form immobilization.

The structural and histochemical patterns of the salivary mesenchyma were analysed in relation to the epithelium of the labial glands during the embryonic development to correlate the structural and histochemical characteristics in both tissues during the histogenesis. Samples of human fetal lips were analysed using H/E, PAS, Cason, Alcian blue, Toluidine blue and Methenamine/silver. The process of glandular histogenesis begun between 8 to 10 weeks. The mesenchyma surrounding the glandular buds had PAS positive granulations which were also alcianophilic, metachromatic and periodatoreactive. Periodatoreactive collagenous fibrillae, reticular cells and nervous fibers of considerable diameter were observed. Basement membranes were PAS positive, alcianophilic and discontinuous. At 12 weeks the mesenchyma differentiated as loose connective tissue which produced a delicate periglandular capsule with fibroblast and collagenous fibrillae. From 20 to 24 weeks the acini were structurally and histochemically differentiated as serous, mucous and mixed. It was postulated that the periglandular mesenchyma would play and important role in the morphogenetic process in relation to the histochemical identification of molecules which have a specific biological functions in the epithelium-mesenchyma interactions during organogenesis.

The aim of the present work is to study on standard porcelain teeth the acid concentration to produce the micromechanic retention with the cemented resin and then to enamel. Teeth were beater-up following the described technique, the application of two different types of etch solutions: hydrochloric acid and fluorhidric acid, in a lack of application time between 10 to 20 minutes. With the purpose of determine the type of etch solution that produce the best amount of micropores in standed porcelain laminates veneers we can conclude that: to the internal etched of the standard porcelain laminates veneer, the utilization of fluorhidric acid is the most convenient, also is necessary the previons stand blaster with aluminum oxide of 25 um to increase the retentive capacity over the etch surface.

Three patients, sisters of B, 12 and 14 years of age with a diagnosis of Gardner's Syndrome are reported. The family history indicated that their mother died of a carcinoma of the intestine at the age of 30. This Syndrome, which is of dominant autosomic inheritance, can be seen in aur city, with so heterogeneous hereditary features. Dentists must know the oral cavity characteristics of this disease (odontomas, cementomas, cysts, supernumerary teeth) that accompany gastric, intestinal, skeletal and tissular disturbances an of other organs (polyps, osteomas, cysts, adenomas), being intestinal poliposis of the colon the most important feature that becomes an "Adenocarcinoma", in the third ald fourth decade in a 100% of the cases. Its incidence in our city is real. The proper diagnosis is made when the clinical study is completed and the dentist may be the first one to watch this syndrome's feature in the oral cavity. A proper medical diagnosis would allow a preventive procedure and a patient's control until the "total surgery of the colon", which is the appropriate therapeutic procedure, is achieved; although there are controversies as regards the time to be carried out.

Salivary glands are dependent on sexual hormones. The aim of the present work is to study the behavior of inflammatory response induced in animals that were castrated and injected with estrogens. Male adult wistar castrated rats (60-90 days) were used. A phlogogen pellet (zinc-oxide-turpentine essence) was placed between their sublingual and submaxillary glands and they were daily injected with 5 units of estrogen. The rats were killed after 8 and 12 days of treatment; submandibular pack was weighed, dissected and fixed in phormol Ph7 for its morphohistochemical study. Phlogogen pellet breaks out an acute inflammatory response that appears attenuated in castrated animals. Such character is enhanced when estrogens are used, disappearing ductal ectasis, becoming evident a granulation tissue of strange body in phagocytic activity and in contact with the pellet. As a consequence its follows that estrogen administration in castrated animals attenuates acute inflammatory response broken out by phlogogen pellet, determining characters with tendency to chronicity and giant cells differentiation of strange body.