Histomorphometric comparison of three bioabsorbable GTR barrier membranes in the canine model.

Guided tissue regeneration (GTR) using bioabsorbable barrier membranes has shown promising and somewhat predictable clinical results. However, limited information is available on the stages of histologic healing when these types of barriers are used. Therefore, the aim of this study was to compare three currently available bioabsorbable GTR barriers (type 1 collagen, polylactide/polyglycolide copolymer, and citric acid copolymer) for the treatment of surgically created periodontal dehiscences in dogs.

[Prevalence of hypertension and its treatment in a population of 26,374 workers].

The control of hypertension requires large scale epidemiological studies to determine the prevalence of the disease and to evaluate the results of therapeutic intervention. This study was based on the examination of 26,374 salaried adult patients during a 12 months period in the Tarn-et-Garonne Regional Industrial Medecine Service. The results of this study showed: 1) the prevalence of hypertension defined as greater than 165/95 mmHg was 5.

[Effect of sleep on blood pressure].

Unlabelled: Seventeen normotensive subjects have their blood pressure recorded each 10 mn, at home, from 7 pm to 9 am, by Spacelabs 5200, and undergo polygraphic, recording of EEG, activity of the mylohyoid muscle and horizontal oculogram allowing in this way to specify the different sleeping stages. The analysis method using increasing rates of SBP, DBP and HR according to different sleeping stages, has showed following results: 1--the pre sleep period (one hour before sleep) is marked by a decrease in blood pressures, with SBP changing sooner than DBP. HR is the variable which fluctuates the most.

[Measurement of arterial flow in the limbs: plethysmography, isotopes, electromagnetic methods].

Measurement of arterial flow is a very old practice, and intra-arterial recordings of pressure and flow have long served as a reference for experimental studies (fig. 1). The definition of a hemodynamic state is inconceivable unless these two parameters are associated.

[Diagnostic value and significance of photoplethysmography in venous insufficiency].

In this study, including 62 patients, or 104 lower extremities, the author demonstrates first, with the chi-2 test, that the method based on Photoplethysmography has a good diagnostic value (sensitivity: 92%, specificity: 88%). Then, with the Student t-test, he demonstrates that the advantage of Photoplethysmography in venous insufficiency is to differentiate easily normal subjects from subjects affected with valve insufficiency, and to establish the differential diagnosis between superficial valvular insufficiency and deep valvular insufficiency. On the contrary, in analyzing the discrepancies between clinical examination and the results of Photoplethysmography, he demonstrates that the diagnosis obtained with Photoplethysmography is limited in the presence of edema, isolated varicose veins, Phlebitis and arterial disease, or during an ineffective compression of the reflux of the superficial venous system.

[Photoplethysmography (PPG) or photoreflexometry (PRM): principle and reproducibility (study of the validity of the method in healthy subjects)].

Photoplethysmography, a non-invasive vascular exploratory test, has recently made great in the evaluation of venous haemodynamics. The principle of Photoplethysmography uses the cutaneous reflection of infrared light in the intradermal venous plexi. Then methods are presented for a reliable implementation of the tests.

[Trial modeling of acinous structures of the rat sub-mandibular gland].

The sub-mandibular glands of rats subjected to unbalanced protein diets for six months were submitted to histomorphometric study in optical light microscopy. Protein deficiency led to slower growth although an hyperprotein diet did not alter acini distribution significantly. The results allowed an acinous structure model related to the diet protein ratio to be tested.

Is osteonecrosis of the femoral head avascular? Bone blood flow measurements after long-term treatment with corticosteroids.

Since nontraumatic osteonecrosis of the femoral head is usually considered primarily as an ischemic disease, blood flow has been studied in femoral segments in two groups of geese, one control group and the other treated with a high dose of corticosteroids for 5 months. There was no histologic evidence of osteonecrosis in femoral heads, and mean bone blood flow in any femoral segments was not reduced in the treated group. These results suggest that osteonecrosis of the femoral head is not caused primarily by ischemia, even if ischemia may play a secondary role in the evolution of the disorder.