Resumo

BRITO-JUNIOR, Manoel et al. Sealing ability of MTA-Angelus with propyleneglycol in furcal perforations. Acta odontol. latinoam. [online]. 2010, vol.23, n.2, pp.124-128. ISSN 1852-4834.

This study evaluated the sealing ability of gray MTA-Angelus mixed with propyleneglycol in furcal perforations using a bacterial leakage test. Furcal perforations were created in 30 human mandibular molars using a size 3 round bur. The samples were divided randomly into 2 experimental groups (n=10) according to the mixing agent. In G1, the MTA powder was mixed with propyleneglycol, while distilled water was used in G2. A 3:1 powder-liquid ratio was used for both groups. The MTA was placed in the perforation with an MTA carrier and condensed with hand pluggers. Nonrepaired (n=5) and totally sealed (n=5) perforations served as positive and negative controls, respectively. Bacterial leakage was assessed daily for 30 days in a double-chamber apparatus with Enterococcus faecalis. Data were analyzed using Fisher exact test (p<0.05) for three leakage periods: 1st to 10th day (P1); 11th to 20th day (P2); and 21st to 30th day (P3). The positive control presented leakage in all specimens within the first 24 hours, while no leakage was observed in the negative control during the experimental period. Leakage was observed in five (50%) of the 10 samples of the propyleneglycol group (G1) and seven (70%) of the distilled water group (G2) by the 20th day, without significant difference between the groups in periods P1 and P2 (p=0.137). The leakage was significantly lower for G1 than G2 in period P3 (50% versus 100%, respectively, p=0.016). In this single aerobic bacterial leakage method, the use of propyleneglycol as a vehicle for gray MTAAngelus increased its sealing ability in furcal perforations at the end of the 30-day experimental period.

Palavras-chave : Mineral trioxide aggregate; Dental pulp cavity; Enterococcus faecalis.

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