AIM OF THE STUDY To describe prevalence and severity of periodontal diseases among urban and rural 11-15 year-olds in Lithuania and to evaluate risk factors, prevention and treatment needs. OBJECTIVES OF THE STUDY 1. To evaluate oral hygiene among 11-15 year-old schoolchildren and to describe dependence on gender, age, parients‘ education and living area. 2. To evaluate freequence of complaints of the bleeding gingiva among 11-15 year-old schoolchildren and to describe dependence on gender, age and living area. 3. To evaluate the dependence of freequence of complaints of the bleeding gingiva on oral higiene, living style and parients‘ education. 4. To describe prevalence and severity of periodontal diseases among urban and rural 11-15 year-old schoolchildren and to elucidate relation with local risk factors and oral hygiene. 5. T o evaluate treatment needs of periodontal diseases among urban and rural 11-15 year-old schoolchildren. 6. To create methods of prevention of periodontal diseases for the 11-15 year-old schoolchildren and present them too schoolchildren and dentists. ORIGINALITY OF INVESTIGATION OUTCOME For the first time in Lithuania the periodontal tissue condition of the eleven to fifteen years old town and village schoolchildren, the main periodontal disease risk factors, and the need for periodontal disease treatment was studied and evaluated, as well as the dental caries and periodontal disease risk factor relationship was identified. The periodontal... [to full text]

O objetivo deste estudo clínico foi comparar a influência do tipo de material e da estrutura física de dois fios dentais em liberar pirofosfato tetrassódico, no espaço interdental. Este estudo crossover foi conduzido em uma população de 10 indivíduos (ambos os sexos) com faixa etária variando entre 18 e 30 anos. Os sujeitos da pesquisa foram alocados aleatoriamente em uma das seguintes seqüências de uso dos fios dentais: (AB ou BA), onde A = polipropileno entrelaçado e B = nylon texturizado de acordo com o material e a estrutura com que os fios dentais foram produzidos. Cada indivíduo usou uma única vez, perfazendo 6 passadas por área-alvo (sendo definido como área alvo as duas faces interproximais dos dentes contíguos selecionados, ou seja, 3 passadas em cada face) cada fio da seqüência a ele alocada. Antes do uso do primeiro fio dental, assim como entre a permuta de fios, foi realizado um washout de uma semana sem fazer uso de qualquer produto que contivesse o princípio ativo (sal anti-tártaro). O fluido gengival das áreas-alvo foi colhido no espaço interdental, com cones de papel absorventes esterilizados (calibre # 35), nos seguintes tempos: (00) antes, (0) logo após; 1, 2, 4, (1, 2 e 4) horas após o uso de cada fio dental. A presença de pirofosfato nas amostras foi verificada por meio de cromatógrafo de íons IC 2000 (coluna AS-11 e pré-coluna AG-11). Os teores de pirofosfato foram comparados entre os dois tipos de fios dentais e entre os tempos de colheita das amostras. O pirofosfato tetrassódico foi detectado no fluido gengival de ambos os grupos em 95% das amostras no tempo 0 - imediatamente após o uso, em 45% das amostras no tempo 1 - após uma hora do uso e em 10% das amostras após 2 horas do uso. Após 4 horas do uso, em nenhuma das amostras foi detectada a presença do princípio ativo em níveis terapêuticos. Conclui-se que a composição do material e a estrutura física dos fios dentais não exerceram influência na liberação e na permanência do agente anti-tártaro, que permaneceu em níveis terapêuticos por um período de até 2 horas após o uso único. / The aim of this investigation was to compare the influence of the type of material and the physical structure of two antitartar dental flosses in releasing tetrasodium pyrophosphate in the interdental space. This crossover study involved 10 subjects (both genders) with ages ranging from 18-30 years old. The individuals were randomly assigned to one of the following sequences of use of the dental flosses (AB or BA), where A = tangled polypropylene and B = texturized nylon according to the structures and the materials what the dental flosses were made, forming two groups of five individuals each. Each individual used the floss 6 times in the target areas (defined as both interproximal surfaces of the selected teeth, 3 times in each surface). Before the use of the first dental floss and between the employments of the two flosses, a one week washout period was done without the use of products containing tetrasodium pyrophosphate. The gingival crevicular fluid of the target areas was sampled with sterile paper points (tapering # 35) in the following times: (00) before the use of the dental floss, (0) soon after the use; 1, 2, 4, (1, 2 and 4 hours after the use, respectively). The pyrophosphate contents in the samples were verified using an ion chromatograph IC 2000 (column AS-11 e pre-column AG-11). The contents of pyrophosphate were compared between the two flosses and among the sample collection times. Pyrophosphate was detected in the gingival crevicular fluid of both groups in 95% of the samples soon after their use, 45% after 1h and 10% after 2h of the use. After 4h, none of the samples had pyrophosphate at detectable levels. Both dental flosses released tetrasodium pyrophosphate at therapeutic levels for up to 2 hours after flossing. Based in the results it can be concluded that the material composition and the physical structure of the flosses had no influence in releasing the antitartar agent, which remained in therapeutic levels for a 2 hours period after the single use.