Alguns aspectos funcionais da articulação temporomandibular.

The authors emphasize the some functional characteristics of the Temporomandibular join, TMJ, and were made comparative study of the auscultatory and sphymografic techniques to TMJ examination. The findings shown that the auscultatory technique furnished important dates to preliminary diagnosis of the TMJ disfunction.

Sensibilidade do colo dental. Uma nova alternativa terapêutica.

The cervical hypersensitivity tooth was analysed and treated by application of a varnish with high fluoride ions content (Duraphat) and of a glass ionomer cement usually indicated to cavity lining (XR-ionomer-Kerr). This technique was applied in sixty-seven teeth of Clinic Graduation patients (Faculdade de Odontologia de Araçatuba) and demonstrated a high index of satisfactory results. The clinical findings of this study relate that, this technique is more one method of choose by clinicians.

Estudo das alterações lineares na região cervical de blocos M.O.D. fundidos em liga de cobre alumínio, segundo as técnicas de expansão higroscópica e térmica.

The authors studied linear alterations processed on copper-aluminum casten MOD blocks, obtained from two expansion techniques (termic and hygroscopic by immersion). UNITERMS: Investment expansion. Thermic expansion. Hygroscopic expansion. Casten Technique.

Biomecánica da movimentação ortodôntica--resposta inicial dos tecidos periodontais.

There occurs a biological response of the tissues of dental support, in answer to the external physiological forces and those realized during clinical treatments with orthodontical purposes. These forces differ from the first ones because they are continuous and time dependent. A great dental mobility is related to the degree of tissue organization of the periodontium system and the orthodontical movement must utilize this exceptional capacity of renewal and adaptation of the periodontium structures adequately. Therefore, through histological means a search was made to evaluate the succession of alterations of the periodontium system after the application of an orthodontical force on the molars of young rats and to interpret the standards of horizontal mobility and their consequences on the periodontium structures, biologically. An orthodontic force was applied on young rats utilizing steel wire placed in a ring form on a contact point between the first and second lower molars. The animals were sacrificed after 30 minutes, 1, 2, 6, 12, 24, 48, 72, 96 and 168 hours after the placement of the metal ring. After technical preparation, the microscopic slides were examined and the results were compared. In all the sections there was evidence of an intense metabolic activity. A gradual evolution of modification on the phenomenons had occurred.

Contribuição para o estudo da proção cervical da veia facial de fetos, recém-nascidos e crianças.

In the study of cervical posterior of the facial vein of the foetus, newborns and children we injected in the veins of the head and neck of 15 corpses, rubber material (Xantopren and or Neoprene Latex). The results showed than the retromandibular and or the facial vein form a venous trunk in 83.3%, what finish always in the intern jugular vein or join the retromandibular vein and casually also with a posterior auricular vein originating the extern jugular vein (16.7%).

Estudio radiográfico do desenvolvimento da dentição permanente de crianças brasileiras com idade cronológica variando entre 84 e 131 meses.

With the help of orthopantomograms we analyse the tooth development beside body weight and height from Brazilian healthy boys and girls. So, their dental age were compared to their chronological age. The results of this investigation, according to the methodology employed, indicated that: 1. girls showed accelerated formation of permanent teeth and mean values of dental age higher than boys; 2. the mean values of dental age in girls were higher than their chronological age in all groups; 3. the teeth development stages were appropriate in assessment of the degree of physiological maturity of a growing child.

Efeito da ciclofosfamida sobre o desenvolvimento de germe dental do incisivo do camundongo.

Thirty six female mice were injected on the 12th day of the gestational period with 0.2 ml of distilled water (control group) or of an acqueous solution containing either 30 mg/Kg or 50 mg/Kg of body weight of cyclophosphamide (treated group). The animal were killed at 24, 48, 72, 96 and 120 hours after the injection and 3 days after birth. It was verified that cyclophosphamide interferes on the tooth germ development and that this effect is in directly ratio of the doses used.

Efeito da ciclofosfamida sobre o desenvolvimento de germes dentais de molares transplantados para a câmara anterior do olho de camundongos.

Mice foetus were killed between 13 and 16 days of the gestational period and their molar tooth germs grafted into the anterior chamber of the eye. The hosts were injected either with 6.25 mg/Kg or with 125 mg/Kg of cyclophosphamide and killed 15 days later. The cyclophosphamide irreversibly, interferes on tooth germ development causing either its total degeneration or an alteration on its morphology forming hypodeveloped tooth germs; its action is directly proportional to the foetus age and to the dose used; it does not induce the formation of osteodentin while some predentin partial cell inclusion may occur.

Estudo histológico comparativo entre dois métodos de obtenção de cortes de alvéolos de ratos.

The chronology of the wound healing process following tooth extraction was studied by means of two kinds of histological cuts. Two groups of 42 albino rats were employed. In the first one, the sockets were cut in a transversal way. In the second one the cuts were performed in a longitudinal way. The rats were sacrificed after 3, 6, 9, 15, 21, 24, and 28 days following the surgeries. After laboratorial outline the obtained pieces were stained by hematoxylin and eosin for histological purposes. It way be concluded that: 1. The results got from longitudinal cuts were in agreement to those described by other authors; 2. The transversal cuts allow us to detect intensive resorption of the lateral alveolar wall at the cervical thirs; 3. On the 21st day following dental extraction the incisor socket of the rat shows a great deal of areas not ossified; 4. The healing process of dental extraction wounds of the upper incisor of the rat is completed between 24 and 28 post operative days.

Estudo histológico comparativo da mucosa palatina em pacientes portadores e não portadores de próteses totais antes e após a instalação de novas proteses.

The authors verified histologically in 20 no dentates patients, the influence of complete dentures on the hard palate mucosa. The patients were divided in two groups: I. Patients that never used complete dentures; II. Patients that were using complete dentures when this research was realized. New prosthesis were made for each one of the 20 patients. Immediately before they received the new prosthesis and ninety days after this, biopsies were realized. The circunferencial pieces of the hard palate mucosa were fixed in formol 10% and coloured with Hematoxylin/Eosin and Mallory's Tricomic for histomorphologic analysis and measuring of the stratum corneum of the epithelium. It was made the statistical analysis and the results showed that: 1. In normal conditions, the utilization of the full dentures produces the reduce of the thickness of the stratum corneum. This was more observed in Group I. 2. The range difference of the thickness of the stratum corneum between the first and the second biopsies in the groups I and II (4.86 microns and 2.18 microns) were not statistically significant. 3. With the use of complete dentures the stratum corneum of the epithelium showed tendence to parakeratinization.

Comportamento dos tecidos periapicais de dentes de cães após a obturação de canal com Sealapex acrescido ou não de iodoformio.

Some endodontists use iodoform in Sealapex in order to rend it more radiopac. This procedure is empiric and for this reason we decided to observe, histologically, if the iodoform introduces some modification in the biological properties of Sealapex. Thirty root canals of dogs' teeth were overinstrumented and filled, by lateral condensation technique, with gutta percha points and Sealapex, with or without iodoform. The iodoform was added in two different proportions: 30 mg or 112 mg for one centimeter of the base and one centimeter of the catalyst of Sealapex. The pieces were removed for histological studies, 6 months after the treatment. The histological results showed that Sealapex encourages apical closure by cementum deposition and that the addition of iodoform does not change that biological property.