Stresses occured mostly around implants when the overdenture was supported by six implants; however, the stress distribution around implants was low with two implants because of tissue support.

The aim of this study was to determine and compare the dimensional changes of polyether and vinyl polyether siloxane impression materials under immersion disinfection with two different disinfectants in three time periods. Impressions were obtained from an edentulous master model. Sodium hypochlorite (5.25%) and glutaraldehyde (2%) were used for disinfection and measurements were done 30 min later after making impression before disinfection, after required disinfection period (10 min), and after 24 h storage at room temperature. Impressions were scanned using 3D scanner with 10 microns accuracy and 3D software was used to evaluate the dimensional changes with superimpositioning. Positive and negative deviations were calculated and compared with master model. There was no significant difference between two elastomeric impression materials (p>0.05). It was concluded that dimensional accuracy and stability of two impression materials were excellent and similar.

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Computerized tomography is a tool that is based on the original concept of conventional tomography [8,9]. Tomography is a type of image in which a 2-D slice is captured and the surrounded slices are blurred. This works by the sensor and the x-ray tube moving in opposite directions around the source. During this movement, the plane of interest remains fixed, and the surrounding planes become blurred due to constantly changing positions on the sensor. A panoramic image is a single tomographic image [9]. Panoramic radiographs cover large anatomical areas, have low radiation doses, and are easily and quickly done, though their distortion and 2-D quality limits their diagnostic value. Computed tomography (CT) was introduced in 1973 by Godfrey Hounsfield. It works by an x-ray tube and a series of detectors which rotate in synchronous directions, as the x-ray tube

This report describes a different approach for diminishing the movements of orbital prosthesis during mimic movements and chewing function. Mechanical devices such as magnets are used to enhance the retention in case lack of the implants. However rigid fixation of obturator and orbital prosthesis can result in movements of the orbital prosthesis during mastication. In this case obturator and orbital prosthesis are combined by magnets. However this combination is not rigid because of an active part which provides movement. This active part allows movements in a space constructed in the acrylic base of orbital prosthesis. Thus, the movements that may occur on orbital prosthesis during chewing can be diminished by this simple mechanism. Due to the fact that designing such a mechanism that minimizes the movements of the orbital prosthesis contributes patient’s comfort. (Eur J Dent 2011;5:459-464)

Purpose: Information about public's knowledge and attitude about oral diseases and their prevention would indicate the need for education of the community. The objective of this study was to have a foresight about oral health attitude and behavior among adult patients in a state dental hospital, Ankara. Material and Method: Questionnaire was prepared using Turkish version of Hiroshima University Dental Behavioural Inventory (HU-DBI) and additional 7 questions. 258 number of patients participated. Edentulous patients and patients under 12 years old were kept out of the study. Pearson's Chi-Square,Kruskall-Wallis H and Mann-Whitney U Tests were used to analyse the results. Results: The average age was 33.0. Of the participants, 51.2% was female and 48.8% was male. 14.3% of the patients was graduated from primary school, 12.1% secondary school, 36.4% high school, 3.9% open university, 33.3% university and post graduate. The mean HU-DBI score was 5.3 (out of 12). Females had significantly higher HU-DBI scores than males (p=0.039). Individuals brushing before sleep had significantly high scores (p=0.0001). Females brushed their teeth before sleep more than males (p=0.019). Females preferred medicine first more than males (p=0.019). Statistically significant difference in prefering medicine first was determined in the group of primary school (p=0.012). As level of education increased, usage rate of dental floss increased (p=0.018). Conclusions: Oral health attitude and behavior of the population studied was not satisfactory. Oral health education should be provided for the community.

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