[Value of thallium 201-SPECT in typing brain space-occupying lesions]. / Valor de la SPECT con Talio-201 en la tipificación de lesiones ocupantes de espacio intracerebrales.

OBJECTIVE: This study was designed to assess the diagnostic accuracy of single photon emission computed tomography with Tl-201 (SPECT Tl-201) to establish the tumoral or non-tumoral nature of brain space occupying lesions in comparison with usual diagnostic techniques. MATERIAL AND METHODS: The study population consisted of 37 patients, 24 men (64.9 %) and 13 women (35.1 %), mean age 48 +/- 16 years. After establishing the clinical and radiological diagnosis of brain lesion, all patients underwent SPECT Tl-201, evaluating it only by subjective analysis and blinded to neuroestructural techniques. After surgical resection all patients were evaluated anatomopathologically to establish the histologic nature. RESULTS: The sensitivity of SPECT Tl-201 (0.87) was higher than standard neuroimaging techniques (0.78). Specificity (0.43), positive (0.87) and negative (0.43) predictive values of SPECT were similar to neuroestructural procedures (MRI and CT scan) with 0.43, 0.82 and 0.38 values. Tumoral disease prevalence was 0.81. Neuroestructural procedures were non-conclusive in 18.9 % of the studies. No non-conclusive results were obtained with SPECT Tl-201. CONCLUSIONS: SPECT Tl-201 is a diagnostic procedure of high sensitivity to establish the tumoral nature of brain lesions, with poor specificity, similar to structural X-ray techniques.

[Orbicular eye reflex (R3) and the valsalva manoeuvre]. / El reflejo orbicular de los ojos (R3) y la maniobra de Valsalva.

INTRODUCTION: Different kinds of tests have been devised to evaluate the autonomic nervous system, including the changes in heart rate and arterial blood pressure after carrying out Valsalva s manoeuvre. However, to date, the behaviour of the three responses to the orbicular eye reflex during this manoeuvre was not known and this was the reason for carrying out our study. POPULATION AND METHODS: We evaluated 12 neurologically normal persons before and after doing a Valsalva manoeuvre by studying the orbicular eye reflex using the method of Kimura and recording the three responses: R1, R2 and R3. RESULTS: The late results (R3) of this reflex, but not those of short (R1) or medium (R2) latency were significantly modified whilst the manoeuvre was carried out (p< 0.05). CONCLUSIONS: Inhibition of the gamma motor neurones during this inspiratory manoeuvre, which are also related to activity of the facial muscles, seems to be the mechanism most likely to explain the findings during the practice of BREATH (Blink reflex autonomic testing in humans). Studies which evaluate only the first two responses to this reflex whilst the manoeuvre is carried out should not be taken too seriously since they may lead to dangerously erroneous conclusions.

Odontodisplasia regional: un caso en el maxilar inferior / Regional odontodysplasia: a case in the lower jaw

La odontodisplasia regional es una rara anomalía dentaria de desarrollo sobre la cual hay solamente alrededor de 100 casos publicados. Clínicamente se presenta como dientes pequeños de color y forma atípicos. Radiográficamente aparece como un "diente fantasma". Se presenta un paciente de sexo masculino de 24 años de edad, con piezas retenidas en el maxilar inferior. Se evalúa su historia clínica y se presenta el tratamiento

Odontodisplasia regional: un caso en el maxilar inferior / Regional odontodysplasia: a case in the lower jaw

La odontodisplasia regional es una rara anomalía dentaria de desarrollo sobre la cual hay solamente alrededor de 100 casos publicados. Clínicamente se presenta como dientes pequeños de color y forma atípicos. Radiográficamente aparece como un "diente fantasma". Se presenta un paciente de sexo masculino de 24 años de edad, con piezas retenidas en el maxilar inferior. Se evalúa su historia clínica y se presenta el tratamiento (AU)

[Use of thermoplasticized gutta-percha in retrograde obturation]. / Uso de la gutapercha termoplastizada como material para la obturación retrógrada.

In 29 teeth, apicoectomies with retrograde instrumentation and retrofilling with low temperature thermoplasticized gutta-percha were performed. Nineteen of them were clinically an radiographically evaluated, showing the following average rate: successes 84.2% (16 cases), failures 10.5% (2 cases) and incomplete healing 5.2% (1 case). The observation period varied from 12 to 41 months. The use of retrograde instrumentation an retrofilling with thermoplasticized gutta-percha is suggested as a useful method in surgical procedures.

Uso de la gutapercha termoplastizada como material para la obturación retrógrada. / [Use of thermoplasticized gutta-percha in retrograde obturation]

In 29 teeth, apicoectomies with retrograde instrumentation and retrofilling with low temperature thermoplasticized gutta-percha were performed. Nineteen of them were clinically an radiographically evaluated, showing the following average rate: successes 84.2

(16 cases), failures 10.5

(2 cases) and incomplete healing 5.2

(1 case). The observation period varied from 12 to 41 months. The use of retrograde instrumentation an retrofilling with thermoplasticized gutta-percha is suggested as a useful method in surgical procedures.

Uso de la gutapercha termoplastizada como material para la obturación retrógrada / [Use of thermoplasticized gutta-percha in retrograde obturation]

In 29 teeth, apicoectomies with retrograde instrumentation and retrofilling with low temperature thermoplasticized gutta-percha were performed. Nineteen of them were clinically an radiographically evaluated, showing the following average rate: successes 84.2

(2 cases) and incomplete healing 5.2

(1 case). The observation period varied from 12 to 41 months. The use of retrograde instrumentation an retrofilling with thermoplasticized gutta-percha is suggested as a useful method in surgical procedures.

[Mouth diseases and acquired immunodeficiency syndrome]. / Enfermedades estomatológicas y síndrome de inmuno deficiencia adquirida.

The purpose of this article is to describe oral manifestations of AIDS, specially opportunistic infections, hairy leukoplakia and Kaposi's sarcoma. Fungal infections, viral infections, salivary glands disturbances and neoplasms are related. Treatment and epidemiology in Argentine are included.

Enfermedades estomatológicas y síndrome de inmuno deficiencia adquirida. / [Mouth diseases and acquired immunodeficiency syndrome]

The purpose of this article is to describe oral manifestations of AIDS, specially opportunistic infections, hairy leukoplakia and Kaposis sarcoma. Fungal infections, viral infections, salivary glands disturbances and neoplasms are related. Treatment and epidemiology in Argentine are included.