Fogorvosi szemle, 2006 (99. évfolyam, 1-6. szám)
2006-04-01 / 2. szám
FOGORVOSI SZEMLE ■ 99. évf. 2. sz. 2006. 67 Material and methods: Calibrated dentists of the Department of Prosthodontics performed oral health surveys according to WHO criteria. “First” survey was conducted between 1985-1989, “second” in 2003-2004. Subjects were interviewed and clinically examined using artificial light source, plane mouth mirrors, dental probes. After formal consent 4606 individuals, originally referred to perform x-ray lung screening examination, were enrolled in the nation-wide study. Representative sample sites from all regions of the country were selected, the patient sample comprised the population of the capital city, large towns and the rural areas. In the “second” survey data collected on 765 RPD - 380 lower and 385 upper jaw restorations-from 607 participants were analyzed. Examined aspects of RPD design were: assured freedom of gingival margin, extension of major connectors, base plate materials, tooth and tissue support. With respect to remaining teeth (3740 teeth) contact with the denture, level of damaging was estimated. Remaining teeth used for retention or support, teeth with other type of denture - contact and remaining teeth free from contact with denture were observed. Remaining teeth damages in the same prosthetic class without treatment were evaluated to use as a point of reference. For interpreting data SPSS 10.0.5 for Windows was applied, statistical analysis was performed using two-way ANOVA. Results:- approximately 50 percent of dentures showed dento-mucosal or muco-dental support- metal base was present in 45-48 percent of dentures- 47 percent of major connectors were designed with reduced extension- freedom of gingival margin was assured in 43-45 percent of dentures- 26.10 percent of reference teeth; 19.11 percent of teeth used for support; 31.53 percent of teeth used for retention; 28.07 percent of teeth free from contact with denture and 38 percent of those remaining teeth with other type of denture-contact showed a sign of damage Conclusions: Findings of our survey show considerable improvement in all aspects of RPD design, but still further progression is required. Dental education and its principles of RPD design influence daily dental practice to a greater extent. Assessment of remaining teeth damages are in agreement with our previous publications from 1990 and confirms the standards we outlined for RPD design with the main priorities of dental support and freedom of gingival margin. DR. K. GÁBRIS,1 DR. B. SZENDE,1 2 DR. M. OROSZ3 1 Department of Pedodontics and Orthodontics; 21. Department of Pathology and Experimental Cancer Research;3 Dental Training Unit, Department of Oral Surgery, Semmelweis University, Budapest NEW DATA TO CLINICO-PATHOLOGY OF PREGNANCY EPULIS During pregnancy many changes occur in the oral cavity, influencing the condition of dentition, periodontium and the mucous membranes. These changes can be: suseptibility to gingivitis; an increase in the amount of dental plaque, and the number of lactobacilli in the saliva; and the decrease of the saliva pH value. Pregnancy epulis is strongly related to gingivitis during pregnancy. For the past 25 years, two of the authors (MO and KG) have provided dental care and surgery for pregnant women, and have performed the related crosssectional and follow-up screening examinations. The total number of examined pregnant women was 2260. In the course of the examinations, a total number of 12 pregnancy epulis was found, i. e. a frequency of 0.48 per cent. The authors present the clinical symptoms of pregnancy epulis, the places of occurence, the indications of excision, the histopathologic examination and the immunohistochemical characteristics of the epulis. The case study of a patient with two pregnancies will be detailed, because the experiences differ from similar reports in international literature. DR. J. GÁSPÁR,1 DR. L. BORBÁS,2 DR. L. PATONAY,3 DR. F. THAMM,2 DR. P. HERMANN,1 J. LUNCZER,4 DR. I. BOJTÁR,2 DR. P. FEJÉRDY1 1 Semmelweis University, Prosthetic Department, Budapest; 2 Budapest Technical University, Biomechanical Research Centre, Budapest;3 Semmelweis University, Anatomical Institute, Budapest; 4Lunczer Dental Laboratory, Budapest THE BIOMECHANICAL EXAMINATION OF MANDIBLE DEFORMATION Introduction: The aim of this in-vitro examination was to register the deformation of mandible under physiological loading. Authors were interested in demonstrating what strains present themselves in the lower jaw during chewing. The importance of the measurement lies in finding out whether the mandible deformation can be the reason of damages in lower fixed restorations. Material and method: Therefore a fully dentate mandible was covered by a photoelastic coating resin in order to indicate strain change using a video-recorder. A specific frame was manufactured to substitute the hang of lower jaw. The physiological loading was executed by different casts of antagonist teeth. The interval of exerted force was decided 0-600 N in accordance with the literature. The photostress analysis determinates the arising strain distribution and can be converted to stresses by an appropriate scale. Finally bone segments were detected. Results: Results were used in a finite element calculation which illustrated the mechanical parameters including the deformation of mandible. A 3D-modell was built according to bone structure. The promising results obtained have proved that the methodology can be successfully utilized in the next steps of planned investigation series even for more complex cases.
