Prakticke zubni lekarstvi最新文献

The authors investigated the problem of the effect of a damp environment on the mechanical properties of aesthetic materials used for fixed prostheses (top lacques Conalor and polymethylmetacrylate resin Superpont C and B). For tests they used bodies made from chromium cobalt alloy with two types of retention--R-polymer and loop. In the combination metal-resin the differences of values are significant, when the top lacquer Conalor is used, the changes of values are not so maded to be statistically significant. A traction test of bodies prepared from Superpont C + B wal also to assess the range of firmness in relation to the period of storage in distilled water. The authors found an increase of the range of firmness within one week and a marked decline after two weeks. The performed tests provided evidence of a rise of the binding firmness due to the absorption by the resin, and confirmed the stabilized behaviour of the lacquer Conalor.

In 1987 a nation-wide survey of the state of dentition of Czechoslovak population in age groups of 2-65 years and above was made. The paper presents the results in the age category of 5-6 years, 12 years, 18 years, 35-44 and 65 year and more, with regard to criteria defined for WHO targets for the year 2000. Data for the CSSR, SSR and CSSR are presented separately.

In the submitted paper the authors investigated the state of teeth, periodontium and the need of treatment in a group of Prague university students. In the investigated group they recorder a lower cariosity than in the same age group 30 years ago. The percentage of subjects without dental extraction on account of caries is smaller than foreseen by WHO in the year 2000. Both is evidence of early therapeutic and preventive care in previous years. To maintain therapeutic and preventive care in previous years. To maintain the positive results of systematic dental care, regular dental treatment also in adult age is essential.

Consistent with the declaration of WHO "Health for all by the year 2000" and the FDI programme "Oral Health by the year 2000" the aim of our work was to become familiar with habits and knowledge on oral hygiene in 16-year-old adolescents. In 1988 we examined a total of 180 adolescents selected at random in one Prague secondary school and two centres for apprentices. For the assessment of habits regarding oral hygiene and knowledge on oral hygiene we used own questionnaire comprising 33 questions. The investigation provides evidence that it is essential to motivate patients more effectively to improve oral hygiene and to instruct during dental examinations on the importance of proper dental care. Dental surgeons should use every visit of the patient to explain oral hygiene and check adherence to it.

The selection of diamond-coates whetstones manufactured by Chirana for turbine drills is extended at present by two new types of toods with a different size of diamond particles. In practice they prove useful in more effective in the final stages of the final preparation of the ground surface.

In the introduction the authors give a brief account of the development of different methods used for correction of a low, shallow vestibule by Schmid and Mörmann's operation which is a modification of Edlan and Mejchar's method. With regard to the favourable results obtained with this operation so far, the authors recommended its wider use.

The authors examined a group of 573 Prague children aged 12-15 years. In addition to the incidence of disorders of the structure of dental tissues they investigated the coriosity (DPE), oral hygiene (OHI) and condition of the gingiva (PI). Their main interest was focused on impaired mineralization of dental tissues the incidence of which is indemic in Prague children. The group was compared with 62 university students. It is of interest that in all indicator except impaired mineralization, the children had significantly better results. The rising curve of impaired mineralization signalises the ever deteriorating living environment in the capital.

The author draws attention to some short comings of contemporary advice regarding the preparation of pillar teeth, in particular as regards the relationship of their longitudinal axes and corresponding surfaces. The author indicates possibilities sparing preparation and the test its importance experimentally with regard to sparing of hard dental tissues.