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We presented the prevalence of MIH in Dubai/UAE for the first time, which represents a developed Middle Eastern city and compared it to results obtained from Greifswald/Germany, which represents a developed European city. The results have shown that the prevalence of MIH in Dubai/UAE is higher than Greifswald/Germany. However, in comparison to the literature, the prevalence of MIH in Dubai is lower than other Middle Eastern cities. Furthermore, we have shown that there is a higher caries level associated with MIH in Dubai. This is also true in Greifswald, Germany and other international studies. In addition, we have reported the prevalence of caries and fluorosis in Dubai and compared them to Greifswald and the previous studies in Dubai. Nevertheless, caries values presented in this study and previous studies indicate that strong attention is required from health authority to this topic. This research provides a strong and comparable source of information on the prevalence of MIH in Dubai for other studies, since it followed strictly all methodological and clinical standards suggested for the assessment and diagnosis of MIH, which are the EAPD criteria. The findings presented in this study require particular attention from the local health authorities and general practitioners for such developmental defect to facilitate early and adequate diagnosis and treatment. This could be achieved by implementing continuing education courses on MIH detection, diagnosis, and treatment for general practitioners. Furthermore, this study has the potential to trigger new studies that would help in understanding the MIH etiology.
The Institute of German Dentists [Institut der Deutschen Zahnärzte (IDZ)] conducted four national cross-sectional surveys of oral health in the German resident population [German Oral Health Studies, "Deutsche Mundgesundheitsstudien", (DMS)]: in 1989 (DMS I, only West Germany), 1992 (DMS II, only East Germany), 1997 (DMS III), and 2005 (DMS IV). In this study, the first two surveys (1989/92) were merged to achieve comparability with the last two studies. The Studies of Health in Pomerania (SHIP) are two independent regional cross-sectional population-based studies conducted during 1997-2001 (SHIP-0) and 2008-2012 (SHIP-Trend) in northeast Germany. In this thesis, we addressed three main questions: First, we aimed to explore the relative contributions of clinical oral health variables assessing caries, periodontal status, and prosthetic status to self-perceived oral health by means of an age-specific approach in DMS IV. Second, we aimed to assess the changes of dental health in West and East Germany between 1989 and 2005 in DMS I-IV. Third, we aimed to evaluate the changes of periodontal status and number of teeth within the last decade based on data from the DMS and the SHIP studies. To explore the associations of self-perceived oral health with clinical oral health variables, we developed separate multinomial logistic regression models for adults and seniors in DMS IV by using stepwise methods. To assess the changes of dental health in West and East Germany between 1989 and 2005, we applied regression models and assessed associations between region, survey year, their interactions and variables assessing dental disease status (number of missing, filled, decayed and sound teeth, the DMFT-index and the probability of having ≤20 teeth), adjusting for potential risk factors for caries. To assess changes of periodontal status in Germany, prevalences, percentages and numbers of teeth affected were defined. In summary, the number of unreplaced teeth showed the strongest association with self-perceived oral health in adults and was the second variable to enter the model for seniors during the stepwise selection process. Between 1997 and 2005, the number of missing teeth considerably decreased in DMS but East Germans had consistently more missing teeth than West Germans in each survey year. Further, during the last decade, the periodontal status significantly improved in SHIP and in West German adults, which might translate into a even higher tooth retention in the future.