ABSTRACT
ABSTRACT Mineral trioxide aggregate (MTA) has been indicated for apexification because it has desirable properties such as excellent biocompatibility, low solubility and dimensional stability. This procedure consists of inducing root apex formation in teeth with incomplete root formation. This article reports a case of trauma in a young dental element, with necrotic pulp and incomplete root formation. For its treatment, apexification with white MTA was performed, which showed excellent results in inducing the continuity of root formation with mineralized tissue in the apical portion. Therefore, MTA is a viable option for apexification, bringing as its main advantage, faster treatment and immediate coronary rehabilitation of the dental element.
RESUMO O agregado trióxido mineral (do inglês, mineral trioxide agregatte - MTA) por possuir propriedades desejáveis como ótima biocompatibilidade, baixa solubilidade e estabilidade dimensional pode ser utilizado para apicificação. Este procedimento consiste na indução da formação do ápice radicular em dentes com rizogênese incompleta. Esse artigo relata um caso de trauma em um elemento dental jovem, com polpa necrosada e rizogênese incompleta. Para seu tratamento, realizou-se a apicificação com MTA branco, que demonstrou excelente resultado ao induzir a continuidade de formação da raiz com tecido mineralizado na porção apical. Portanto, o MTA é uma opção viável para a apicificação, trazendo como principal vantagem, um rápido tratamento e a possibilidade de restauração coronária imediata do dente.
ABSTRACT
Objective: to evaluate the ability of different MTA thicknesses (3 and 5 mm), with or without conventional fillings, in preventing bacterial infiltration of Enterococcus faecalis in teeth with incompletely formed apices. Material and Methods: apical barriers were created which 3- and 5-mm-thick of MTA with and without conventional filling of the remaining root. 48 single-rooted human teeth were divided into four experimental groups (n=10) and two controls groups (n=8). After being mounted on a testing apparatus, Enterococcus faecalis was used as an indicator of bacterial infiltration. Inoculations were renewed every 3 days during a period of 60 days, and infiltration was assessed daily by checking the culture medium for turbidity. The results were analyzed using descriptive and analytical statistics (survival analysis). The level of significance was set at 5%. The tests were performed using the software GraphPad Prism 5.00. Results: the positive control group infiltrated within 24 hours, while the negative control group, no infiltrated. The Long-rank test did not demonstrate the existence of differences between groups. However, the Long-rank test for tendencies showed of a tendency to retard the infiltration. Conclusion: none of the MTA barriers were effective in preventing bacterial infiltration. The gutta-percha filling of the root segment in association with the 5-mm apical barrier of MTA showed a tendency to delay bacterial infiltration.