Regular development of our teeth is the result of reciprocal induction processes with continual development stages. The non-interrupted development of the organism is the basic precondition of healthy dental tissues. It is, therefore, necessary to be aware of the fact that everybody takes on full responsibility for their own health. If we want to have clean and healthy teeth without tooth ache, oulitis and other problems we must take proper dental care. Tooth decay is the most widespread disease affecting the humankind from of old and proper dental care is, therefore, very important. Deteriorating dental tissues result in tooth decay and have various speed and intensity. Tooth decay affects tooth enamel, get to dental pulp and consequently may cause neuritis the result of which is prolonged pain. In the worst case, abscess may appear. The consequences may become the source of protracted disorders of permanent teeth development. Stomatologists can introduce to us the basics of proper dental care. The first visit at the dentist is recommended before a problem appears. If some problems occur it is necessary to visit the dentist sooner, then the regular preventive exams follow. At least twice a year, we should undergo preventive checkups. Regular monitoring of dental health is important especially for the early identification of undesirable changes in our teeth and gums. Relationship between the dentist and child is also very important. Factors that are important for the prevention of teeth damage are motivation, suitable diet, physical condition, physical education, regular mouth hygiene performed with the use of chemical and mechanical applications. Using of fluoride, changes in life style, suitable eating habits and hygiene habits are also important. If a person develops bad eating habits at a young age the risk tooth decay is becoming more probable. Unhealthy nutrition causes metabolism disorders that result in the increased occurrence of tooth decay and mucosa disease in oral cavity. The nutrition composition is important also for the mineralization and development of hard adenoblasts. Not balanced nutrition leads to the poor development of man and, therefore, to the easier occurrence of the tooth decay. Most serious problems are caused by sugars as bacteria use it as a source, and acids as the subsequent products diminish tooth enamel, dentine or dental pulp. Alcohol, drugs and smoking are counted among other risk factors with negative influence on dentition. Eating disorders are the opposite of healthy and correct eating habits. They are often encountered in diseases connected mainly with lack of appetite. The excessive intake of food occurs especially in obese children. Strengthening of dental tissues resistance, supporting the mineralization process and protection against the bacteria creation is supported by fluorine. For the healthy development of tissues the intake of calcium, phosphor, proteins, minerals and vitamins is important. A very important part of the rational nutrition represent milk and cheese. Pregnant women and nursing mothers especially should follow an appropriate diet. Apart from others consequences, the nutrition structure influences the composition and amount of saliva. Chewing of gum that increases the production of saliva serves also to the teeth cleaning and balances the mouth pH. Chewing can even be better than tooth brushing with toothpaste. Teeth are the symbol of energy and vital force. Poor teeth show lack of immunity and represent the sign of lowering vitality.

My diploma work deals with the relationship between the oral health condition of patients and their socio-economic status. The theoretical section of my work is focussed on stomatology and its division, oral cavity disorders and their treatment, prevention and prophylaxis, the distribution of teeth defects and their treatment. The practical section is based on a hypothesis. The objective of my paper consists in the evaluation of the impact of the socio-economic status of a person on his or her KPE index value. The hypothesis has been evaluated on the basis of a secondary analysis of data acquired from the case histories of patients attending a dental practice as well as on a questionnaire survey. The oral health evaluation has been supported by KPE index and the supplementary CPITN and API indexes. Goldthorp´s class diagram has been used for the purposes of the respondents´ socio-economic status evaluation. The status creating factors applied in my research have been the standard and level of education and professional training of a respondent, family income, his or her share in the power and decision sphere etc. It has been found that there is a correlation between a higher level of achieved education and professional training, a higher social status, a higher income on the one side and more favourable KPE index values as well as a better overall dental health on the other side. Primarily, the research presents the basis of my diploma work. It may also be published in a journal for stomatologists, nurses and dental hygienists. It is also aimed at internal use in the dental practice.

"Oral health is important for general state of health and also for quality of life". This is how treatise on problems of oral health WHO starts. This sentence was an inspiration for this dissertation called "Comparison of oral health of 12-15 year old adolescents in the region of Jihlava and Havlíčkův Brod". All over the world 60-90 % of school age children have a dental caries. It is a localised patological process of microbiological origin which affects hard tooth tissue. It can lead to the loss of vitality of a tooth marrow and other patological phenomena. It is a very frequent disease in children´s age. One of the indicators of level of oral health is DMF index. It is a sum of permanent teeth with decay, with filling and teeth already extracted due to tooth decay. This thesis traditionally consists of theoretical part, which is a compiled information from specialized literature and practical part, where a method of cross-sectional study was used. The practical part consists of a cross-sectional study. The aim of this part was to map the occurence of tooth caries at 12-15 year old adolescents in chosen regions. It focuses on comparison of differences in oral health between these two regions and between boys and girls in both regions measured by DMF index. Part of this study is also a comparison of oral health of chosen population with recommended parameters of WHO for 12 years old. To fulfil this target, selected dentists were contacted and asked for cooperation. Collection of data was done with help of nurses in the dentists' offices. Data were recorded from health cards of the patients to a prepared record keeping sheet. Anonymity was preserved during collection and processing of data. To validate the data the corectness of inserted data was randomly rechecked. Data were entered into Microsoft Office Excel data sheet and were backed up. Three hypotheses were rised in this thesis: H1: There exists statistically significant difference in teeth defectiveness in chosen regions. The difference at defectiveness of teeth has been demonstrated. Higher level of oral health is in Jihlava region study population. H2: There exists statistically significant difference in teeth defectiveness between girls and boys. This hypothesis was rejected. Alternative hypothesis was accepted: Statistically significant difference in teeth defectiveness between girls and boys does not exist. H3: Oral health of 12-15 year old adolescents in chosen regions has got parameters recommended by WHO. This hypothesis was rejected. Alternative hypothesis was accepted: Oral health of 12-15 year old adolescents in chosen regions does not have parameters recomMended by WHO. Results of this study will be communicated with all participating dentists. Results of the study has also shown a significantly higher defectiveness of teeth in the studied population in comparison with foreign study in a similar age sample of young people from New South Wales. On the other hand, young people from Jihlava and Havlíčkův Brod more often attend dentists and their results are much better at this point. In comparison with national studies from years 1998, 2003 and 2010 our results are more positive. It is possible to see gradual increase of percentage of young people with intact teeth and also slow decrease of average DMF value. In comparison of these two regions Jihlava and Havlíčkův Brod, the results from Jihlava were more positive. Statistically significant difference in defectiveness of teeth between girls and boys was not notified. Average DMF in studied population was 1,7. WHO recommended DMF 3 for the year 2000 and 1,0 for the year 2010. DMF index in our study did not reach the level recommended by WHO for the year 2010.