MTA Fillapex and Endofill had an antibacterial effect against E. faecalis before setting, but none of the sealers maintained antibacterial activity after setting, despite the high pH of the MTA-based materials.

ResumoO objetivo deste estudo foi avaliar a qualidade das obturações dos canais radiculares realizados por estudantes de graduação em Odontologia. A amostra foi constituída por 156 canais radiculares obturados e analisados através de radiografi as periapicais. Compuseram a análise dentes uni e multirradiculares com tratamento endodôntico concluído há pelo menos dois anos. As radiografi as foram avaliadas por três endodontistas calibrados. A condição periapical foi classifi cada como tendo ou não presença de lesão. Já a qualidade da obturação radicular foi determinada através de dois parâmetros: a relação do comprimento da obturação com a extensão do canal e a qualidade da condensação do material obturador. Os resultados mostraram que 75 canais (48%) foram classifi cados como tendo qualidade de tratamento satisfatória. Em 101 canais radiculares (64,5%), observou-se a presença de lâmina dura, caracterizando, portanto, uma condição periapical normal. Palavras-chave:Proservação; Qualidade do tratamento endodôntico; Condição periapical; Estudantes. AbstractThe aim of this study was to evaluate the periapical condition and the quality of root canal fi llings accomplished by undergraduate students. The sample was constituted by 156 fi lled root canals of one-root and multi-root teeth whose treatment conclusion had happened at least two years before. Periapical radiographies were evaluated by three calibrated endodontists. The periapical condition was classifi ed as having or not having periapical lesion. The quality of the root fi lling was determined using two parameters: the relationship between the length of the fi lling with the extension of the canal and the quality of the condensation of the fi lling material. The results showed that 75 (48%) root canals were classifi ed as possessing satisfactory treatment quality. In 101 root canals (64.5%), the presence of hard layer was observed, characterizing a normal periapical condition.

Purpose: To compare the accuracy of three electronic apex locators (EALs) and evaluate the influence of cervical preflaring in them. Methods: The working length (WL) of thirty extracted human mandibular incisors was determined visually. All teeth were mounted in conducting medium and tested with: Novapex, Mini Apex Locator and Propex II. The electronic WL was determined before and after preflaring with LA Axxess burs. Differences between the electronic and visual WL were calculated and analyzed by Friedman and Wilcoxon tests. Radiographs were taken using the electronic WL of each EAL and the distance between the instrument tip and the radiographic apical vertex was measured. This value was compared to a reference or ideal value (1 mm) by one-sample t test. Results: The Novapex was the most accurate EAL before and after the preflaring procedure, which was confirmed by the radiographic analysis. All EALs tested increased their accuracy after preflaring, but no significant difference was noted for the Novapex. Conclusion: The Novapex was more accurate compared to the Mini Apex and Propex II. Preflaring procedure was advantageous for all EALs.

Em uma primeira etapa deste trabalho, buscou-se desenvolver uma técnica de polimento químico de resinas acrílicas que utilizasse o forno de microondas LG Modelo MB (315m1- 1.000watts) para o aquecimento de líquidos para polimento. A potencia do forno de microondas e o tempo necessários para aquecer os líquidos para polimento ate uma temperatura de 81 ± 5°C — intervalo de temperatura equivalente ao obtido na polidora elétrica- foram 900 watts (90% da potencia máxima) e 90 segundos. A seguir, foram confeccionados 100 corpos-de prova, 50 amostras de resina acrílica quimicamente ativada e 50 de resina acrílica ativada por energia de microondas, os quais foram submetidos a cinco diferentes técnicas de polimento: 1) polimento mecânico- controle, 2) polimento químico com liquido para polimento em polidora elétrica, 3) polimento químico com monômero de resina acrílica em polidora elétrica, 4) polimento químico com liquido para polimento aquecido em forno de microondas, 5) polimento químico com monômero de resina acrílica aquecido em forno de microondas. Eles foram comparados, quanto a eficacia da técnica, usando como parâmetro a rugosidade superficial das resinas acrílicas. Para essa avaliação foi usado um rugosímetro SJ-201 (Mitotoyo - Japan). Os resultados foram submetidos a analise de variância e as medias comparadas pelo teste de Tukey (a = 1%). Os resultados mostraram que todas as técnicas de polimento geraram valores de rugosidade com diferença estatística significativa quando comparados com a técnica de polimento mecânico (controle), a qual apresentou valores de rugosidade superficial abaixo do limiar de Ra, estabelecido como 0,2 um. Não houve diferença estatisticamente significante entre as quatro técnicas de polimento químico.

Purpose: Calcium hydroxide is not fully effective against Enterococcus faecalis (E. faecalis), a facultative anaerobic bacterium proven to be resistant to most conventional disinfection processes. The aim of this in vitro study was to evaluate the effect of calcium hydroxide, omeprazole and the association of these substances against Enterococcus faecalis, as well as to evaluate if the acidcatalysation of the omeprazole had any influence in the results. Methods: The Minimum Inhibitory Concentration (MIC) of these drugs against E. faecalis (ATCC 29212) was determined using macrodilution test adapted from the CLSI (Clinical Laboratory and Standards Institute). Solutions with different concentrations of calcium hydroxide, associated or not to omeprazole, were tested. Data were statistically analyzed using ANOVA test with Tukey post-hoc, with a level of significance of 5%. Results: The MIC to calcium hydroxide was 32 mg mL -1 and, when associated with omeprazole, this was reduced reduced to 16 mg mL -1 . The omeprazole and acidified omeprazole had similar activity. Conclusions: Omeprazole potentiated the effect of calcium hydroxide, since the association of these drugs reduced the MIC for E. faecalis. The acidification of omeprazole, when associated with calcium hydroxide in different concentrations, did not influence its effect.

The aim of this study was to evaluate histologically the passive use of ultrasound for cleaning the apical portion of flattened root canal systems. Material and methods:The sample consisted of 20 extracted human mandibular incisors which were divided into two groups after being prepared with the rotary system Hero 642 up to size #45 surgical diameter: Group A – final irrigation with 4 ml of 2.5% sodium hypochlorite by the conventional technique using a syringe, and Group B – final irrigation with 4 ml of 2.5%, sodium hypochlorite divided into 1 ml amounts which were activated with the passive use of ultrasound for 15 seconds each time, generating a total activation period of 1 minute. Following, the teeth were subjected to morphometric analysis to evaluate the cleaning ability promoted in both groups. Results and Conclusion: Statistical analysis showed significant difference (p < 0.05) between the groups, with the passive ultrasonic irrigation resulting in cleaner canals.