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An in vitro study of coronal leakage after intraradicular preparation of cast-dowel space
A F Pappen1, M Bravo, S Gonzalez-Lopez
1Department of Endodontics, School of Dentistry, University Federal de Pelotas, Rio Grande do Sul, Brazil.
Statement Of Problem:
Coronal leakage can produce contamination of periapical tissues, resulting in endodontic failure.
Purpose:
The purpose of this in vitro study was to evaluate the ability of 2 sealers to prevent coronal leakage in canals filled with gutta-percha and prepared for cast dowels but without coronal sealing.
Material And Methods:
The crowns of 60 extracted single-rooted teeth were amputated. The root canals were prepared corono-apically and filled with gutta-percha cones and 1 of 2 different endodontic sealers: a resin-based sealer (AH Plus) and a calcium hydroxide-based sealer (Sealapex). Specimens were then stored in water for 7 days to allow the sealers to set. The specimens were prepared in 1 of 2 ways: no preparation for cast dowel or preparation of cast-dowel space (n=15). External surfaces of the roots were sealed with cyanoacrylate cement. The teeth were thermal cycled at 5 degrees and 55 degrees C in water baths (dwell time=30 seconds) for 500 cycles. Specimens were then submerged in 2% methylene blue colorant for 24 hours. Microleakage was measured according to the percentage of area stained with the colorant. Effects of each factor (cast-dowel preparation and type of sealant) on microleakage were analyzed by the Student t test (alpha=.05).
Results:
The AH Plus and Sealapex sealers with cast-dowel preparation resulted in significantly (P<.001) more leakage compared to sealers with no dowel preparation.
Conclusion:
Cast dowel-space preparation had a negative influence on the sealing ability of the remnant root-canal filling material.