a b s t r a c t a r t i c l e i n f oMethods: Sixty-six mandibular premolars were prepared and randomly distributed into three groups, according to the root canal sealer used for filling, as follows: G1 AH Plus (Dentsply-Maillefer), G2 MTA Fillapex (Ângelus) and Sealapex (Kerr Corporation). After one week in an oven (37°C, 100% humidity), the teeth were immersed in India ink for 15 and 30 days (n = 10), and then submitted to diaphanization to verify the amount of coronal microleakage using an operating microscope. The values were statistically analyzed using Kruskal-Wallis test (p < 0.05).Results: MTA Fillapex had the highest coronal microleakage values, in both periods (15 and 30 days). Coronal microleakage mean values were only significant in comparison with AH Plus group at the 15 day-period (p < 0.05).Conclusions: None of the tested cements was able to prevent coronal microleakage. However, MTA Fillapex had the worst results at 15 days. Métodos: Sessenta e seis pré-molares inferiores foram preparados e distribuídos aleatoriamente em três grupos, de acordo com o cimento endodôntico utilizados para obturação, da seguinte maneira: G1 AH Plus (Dentsply-Maillefer), G2 MTA Fillapex (Ângelus) e Sealapex (Kerr Corporation). Depois de uma semana em estufa (37°C, 100% de humidade relativa), os dentes foram imersos em corante durante 15 e 30 dias (n = 10), e em seguida, submetidos a diafanização para verificar a quantidade de infiltração coronária utilizando microscópio operatório.
The aim of the present study is to report a clinical case of a root canal treatment of a maxillary central incisor with two root canals. The clinical examination showed a discrete increase in the crown width of tooth 11, which responded negatively to ice sensitivity, percussion and palpation tests. The tomographic examination of tooth 11 revealed the presence of two root canals and bone rarefaction in the periapical region, thus suggesting a possible pulp necrosis and asymptomatic apical periodontitis. Local anesthesia and proper isolation were performed, followed by coronal access to the pulp chamber with the aid of an operating microscope. The working length was established at 21 mm in the distal portion and 20 mm in the mesial portion of the tooth. The root canals were mechanically prepared with the Wave One ® system and obturated using the hybrid thermo-mechanical technique and AH Plus ® sealer. The patient remained asymptomatic during the 12-month follow-up period, which suggests that the therapeutic protocol was adequate and the treatment was
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