Biomedical subjects
Publications and source records attributed to M Orosz.
A rare case of a 10-year-old girl with an endodermal sinus tumor that occurred in the nasal cavity is presented. She received chemotherapy and radiotherapy at the age of 4. The subsequent abnormal development of the maxillary teeth is described and discussed in the light of the known effects of radiotherapy.
According to dental literature, the frequency of supernumerary teeth is 1-3%. The authors analyzed the orthopantomograms of 1875 children and adolescents aged between 6 and 18 years to determine the frequency of supernumerary teeth at the Department of Dentistry for Children and Orthodontics. The frequency was found to be 1.92%. The sequence of frequency of supernumerary teeth was: mesiodens, lateral incisor, central incisor. 77.8% of the supernumerary teeth occurred in the maxilla, 97.2% in the frontal region. Besides the data found, two successful cases of surgical and orthodontic treatment are also presented.
In order to find out what branches of Dentistry are recognized in Europe as Dental specialties a questionnaire was designed and sent to various Associations and groups across Europe. It contained eight main questions covering the various specialties that were recognised or were to be recognised. Responses were obtained from 28 countries, 15 EU member states and 13 non member states. The results from the questionnaire indicated that there was a broad agreement on many of the questions but a considerable variety of opinions. There seems to be a desire to harmonize standards across Europe for the benefit of the profession and the public.
In order to find out what branches of Dentistry are recognized across Europe as Dental specialties, a questionnaire was designed and sent to various Associations and groups across Europe. It contained 8 main questions covering the various specialties that were recognised or were to be recognised. Responses were obtained from 27 countries, 15 EU member states and 12 non member states. The results from the questionnaire indicated that there was a broad agreement on many of the questions, but a considerable variety of opinions. There seems to be a desire to harmonize standards across Europe for the benefit of the profession and the public.
Quantitative description of biomechanical behaviour of the blood vessel wall is needed for understanding normal and pathologic functions of the vascular system. In this study we investigated the stress relaxation of blood vessels. Strips were cut from the vessel wall and they were stretched in a stepwise manner until they tore. The mechanical stress (approximately 10(5)-10(6) Pa) induced in the strips was determined. This showed an initial steep rise and then a slow, near exponential decay (stress relaxation) after each step of stretch. For the mathematical description we used two technical models (the Maxwell and the Kelvin model--they are built of two elastic elements and of one viscous element), as well as a one-dimensional continuum mechanical model. The moduli of the models were identified with a curve fitting method. Our aim was to compare these models in order to elucidate, which one describes the rheological behaviour of the blood vessel more correctly. The results of our analysis show that the corresponding moduli diverge from each other in the Maxwell and Kelvin models: that is, they depend on the mode of the assumed connection between the mechanical units. In contrast, moduli of the continuous model are unambiguous. We conclude that the continuous model properly describes the stress relaxation of the vascular wall. Its advantage over the technical models is that moduli describing the viscoelastic behaviour of the tissue do not depend on the not wholly well-known structure of the wall components.
Eosinophil activation markers-eosinophil cationic protein, eosinophil protein-X-were investigated in acute severe asthma. The elevation of the eosinophil activity markers were found in every cases at the time of admission. The measurements were repeated eight days later. The eosinophil cationic protein and eosinophil protein-X levels were increased at the time of the admission, and a decreasing tendency was detected eight days later. The peak expiratory flow rates were monitored during the period of the hospital staying. It is important to note that, the size of the bronchial obstruction did not show any similarity in all cases comparing to the elevation or decrease of eosinophil activity markers. The authors proved the eosinophil activation in vivo in acute severe asthma. The continuous monitor of the eosinophil activity markers might have a practical value in searching of the optimal therapeutic modalities in the asthmatic patients.
Authors present a 12-year old boy, whose diagnosis was epidermolysis bullosa. Beside the general characteristics of the illness they discuss the dental status of the patient and sum up the literary references together with other anomalies occurring in epidermolysis bullosa hereditaria.
FDI was founded in 1900, Paris, 95 years ago. At this International Dental Congress professors József Arkövy and Lajos Ottófy both held lectures. The Hungarian Dental Association (HDA) could join FDI, however, only in 1966. Today close contacts and collaboration are developing between HDA and FDI.
The inflammatory mediators of allergy were investigated in symptomatic patients suffering from upper respiratory tract allergy. The serum tryptase level as an indicator of mast cell activation and serum eosinophil cationic protein level as an indicator of eosinophil activation were measured. They did not find any alteration in the serum level of tryptase. The level of eosinophil cationic protein significantly increased in symptomatic patients comparing to normal healthy controls. There was not any correlation to the severity of symptoms and to the absolute eosinophil count in the peripheral blood. The different activation possibilities of the eosinophil granulocytes are discussed, highlighting the role of Th2-helper lymphocytes.
The authors describe a case of a 4 years old boy. In connection with this case they discuss the latest classification of histiocytosis accepted by the Histiocytosis Society, and the stomatological aspects of the disease (severe gingivitis, necrosis of the gingivae, ulceration, and high degree of tooth mobility). The new classes of the disease: Langerhans cell's histiocytosis, Non-Langerhans cell's histiocytosis, malignant histiocytosis.
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In the oral cavity of white rats a series of experiments were made by CO 2 laser beam, by handpiece, micromanipulator, and an operation microscope. The authors examined the extent of the damaged tissue on the surface and in the depth of the wound. They established that in the case of 90 degrees angle of incidence--same power, exposition time and focus--the laser beam caused the deepest crater and the least damage to the surface. The decrease in the angle of incidence caused a decrease in the depth of the laser crater and increase in the surface. The 90 degrees angle of incidence CO 2 laser beam gives the optimal possibility for the precise elimination of the pathologic tissues on the surface and in the depth, without damaging the surrounding healthy structures. This operation not only protects the normal structures but also defends the physiological functions. In cases where it is not possible to apply the CO 2 laser beam at a minimum of an incidence of 60 degrees --the indirect way--the reflection has to be chosen. These aspects are important not only in the oral cavity but in other CO 2 laser operations.
The CO 2 laser beam caused typical "V" form defects in living tissues directed at an incidence of 90 degrees . In other cases the defects are elliptic. By decreasing the angle of incidence of the laser beam, the depth of the laser crater decreases and the healthy tissues are also damaged. The authors constructed a measuring instrument and performed geometric measurement in the oral cavity. At an incidence of 90 degrees , considered by them to be optimal, the laser beam can reach the surface of the two third parts (medial and posterior) of the oral cavity only through reflection. The authors constructed a laser endoscope with a fixed and revolving mirror. Using this device they could not only direct the laser beam to the areas of the oral cavity that are accessible with difficulty but they could also achieve a laser beam incidence always close to 90 degrees .
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Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.