Resumo

CAMEJO SUAREZ, María Valentina; GOZALEZ BLANCO, Olga  e  PACHECO, Aura. Microfiltración coronaria in vitro de streptococcus mutans,  a través de tres cementos provisionales en dientes tratados endodóncicamente. Acta odontol. venez [online]. 2008, vol.46, n.3, pp.301-310. ISSN 0001-6365.

The coronal microleakage is cause of endodontic failure. The purpose of this study in vitro was to evaluate the ability of IRM®, Cavit® and glass ionomers GC Fuji I® to prevent the coronal leakage of S. mutans in endodontically treated teeth to 90 days. Forty intact extracted human teeth were coronally shortened to a uniform length of 14 mm. The root canal were prepared and obtured with sealer and gutapercha with lateral condensation. The dentinal smear layer was removed before obturation. Standardized access cavities to 4mm depth. The teeth were divided in two groups: Experimental group (30 teeth) and Control group (10 teeth). The teeth were placed into a coronal leakage apparatus that contained an upper and lower chamber, daily observations were made for bacterial growth and for determine the length of time for the bacteria to penetrate complete of canal root. All positive control teeth showed bacterial penetration in the first 7 days, while the negative control teeth no showed contaminatied thoughout the test period. The groups "IRM" showed 100% leakage, "CAVIT" 60% and "FI"40% . The mean measure days for group "IRM", "CAVIT" and "FI" were 25,4 , 28,67 and 56,75 respectivement.

Palavras-chave : Coronal microleakage; Streptococcus mutans; Provisional restaurations; endodontically treated teeth.