Biomedical subjects
Publications and source records attributed to O Ciobanu.
The aim of this study was to quantify the stress induced in the periodontal ligaments by the orthodontic appliances. A finite element model of an orthodontic system, applied on a lower premolar, was developed in different loading conditions. The maximum stress values depend on the location, direction and the magnitude of force application.
The stress quantification in dento-periodontal structures is an important concept, as stress in the tissue and in surrounding structures. A number of clinical studies have suggested figures for such an optimal stress strange. The clinical experiments can be completed with mathematical analysing methods as finite element method. Once the basics of biomechanics understood laws the treatment goes clearly defined, the computer aided design improve the optimal restorative prosthetic or orthodontic appliance. The finite element method (FEM) makes possible the numerical simulation of different clinical situations. Based upon mathematical modelling and extrapolation from experimental studies, practical conclusions can be drawn concerning the different types of forces and their subsequent induced relationship to the stresses. Clinical and histological experiments confirm the mathematical prediction offered by the FEM.
The paper presents some aspects about synthesis of new materials called zeolites which can be utilised as filters with wide application in clinical practice in microbiology and in pharmaceutical industry. The SAPO-5, SAPO-11 and SAPO-34 zeolites were synthesised by hydrothermal crystallisation and using different mixtures. The crystallisation was carried out in teflon-lined stainless steel autoclaves at 180-195 degrees C for 1-2 days, under autogenous pressure. Filtering properties of these materials are different because their pore diameters are different.
The authors are reviewing on a lot of 2844 cases between 1996 and 2000 the difficult problems of differential diagnosis between acute surgical abdomen in children and intestinal tuberculosis, abdominal tumors and inflammatory diseases such as acute osteomielitis. They are presenting 13 particular cases in which the acute abdomen diagnosis was difficult or even omitted.
The Leonardo da Vinci training programme supports innovative transnational initiatives for promoting the knowledge, aptitudes and skills necessary for successful integration into working life. Biomedical engineering is an emerging interdisciplinary field that contributes to understand, define and solve problems in biomedical technology within industrial and health service contexts. Paper presents a Leonardo da Vinci pilot-project called Web-based learning and training in the field of biomedical and design engineering (WEBD). This project has started on 2001. The WEBD project proposes to use advanced learning technologies to provide education in the www. Project uses interactive 3D graphics and virtual reality tools. The WEBD distance training permits users to experience and interact with a life-like model or environment, in safety and at convenient times, while providing a degree of control over the simulation that is usually not possible in the real-life situation.
Intussusceptions is the most common cause of bowel obstruction in children between 5 months and 1 year of age. Intussusceptions occurs when a portion of the bowel folds like a telescope, with one segment slipping inside another segment. This study refers to a group of 72 children, with intussusceptions diagnosis between 1975-2000 in our clinic. The authors are also analyzing these cases from the point of view of frequency on years, seasons, age, sex, residence, clinical forms, time since the intussusceptions occurred until the treatment begun.
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The paper deals with the graphic reconstruction of anatomic surfaces in a virtual 3D setting. Scanning technologies and soft provides a greater flexibility in the digitization of surfaces and a higher resolution and accuracy. An alternative cheap method for the reconstruction of 3D anatomic surfaces is presented in connection with some studies and international projects developed by Medical Design research team.
The paper presents a new approach to human movements and positions using Descriptive Geometry, a discipline used in 2D and 3D description of object positions in space. Some particular positions of the human body are depicted using a reference system formed by three orthogonal planes: horizontal, vertical and lateral. Positions of arms are described using precise terms used in Descriptive Geometry. The use of precise terms in human positions description can improve communication and understanding of more complex positions in space.
Paper presents the results of an international research project carried out by author in the laboratories of the University of Pisa, Italy and funded by NATO. Research showed the feasibility of the measurement of residual stress up to 90% of the material yields strength using a four gages rosette and analytical relations. This new method can be used with an improved accuracy in residual stress measurements in bones, prosthesis and implants.
The paper present a number of 17 cases of esophageal atresia, hospitalised and operated in a period of 4 years (2001-2004). The authors are underlining the importance of the prenatal diagnosis, preoperative and postoperative care, the chance for primary anastomosis for type III A of the disease, complications and prognosis related to the type of atresia. Esophageal atresia is a success of a complex team where the role of the neonatologist and anesthesiologist, next to the surgeon, is very important.
Gastroschisis is a severe congenital malformation of the abdominal wall, with relative low incidence. The authors are analysing different therapeutic methods, in a group of 17 cases, hospitalised and operated in Department of Pediatric Surgery, Emergency Hospital of Craiova. They are underlining the importance of the ultrasound prenatal diagnosis of the malformation, close related to different therapeutic methods applied in this period of time and also are advising secondary closure of the abdominal wall, using a synthetic material (Silo-bag) for temporary coverage of the intestine developed outside the peritoneal cavity. This method helped with the decreasing of mortality in gastroschisis but with high costs of treatment.
The lesions of the anus and the rectum are not very really found in children, representing even a appreciable percentage; in the Pediatric Surgery Clinic of the University Hospital no. 1 of Craiova were admitted and operated 12 patients with lesions of the rectum between 1986 and 1998. The causes of these lesions were: polytraumatism--3, falls in different sharp things--7, rectal perforations on the septic base from the peritoneal cavity--1, iatrogenic cause--1. The surgical treatment were consisted in: the suture of wounds on the perineal way, lavage, drainage, antibiotherapy--6 cases, the iliac left anus with the re-establishing of the continuity--3 cases, the suture of wounds on the perineal and abdominal ways--2 cases. The conditions were good in 9 cases--cured, and 3 deceases (2 polytraumatism, 1 case malformed new-born with perforation produced by using haegar).