Effect of root resection on the apical sealing ability of mineral trioxide aggregate

Edwin L. Lamb, Robert J. Loushine, R. Norman Weller, W. Frank Kimbrough, David H. Pashley

Research output: Contribution to journalArticlepeer-review

51 Scopus citations


Objective. The purpose of this in vitro study was to determine the minimum depth of mineral trioxide aggregate (MTA; ProRoot; DENTSPLY/Tulsa Dental, Tulsa, Okla) required to maintain an apical seal following root resection. Study design. In 10 instrumented teeth, MTA was used to obturate the apical 6 mm of the root canal and was allowed to set for 48 hours. Leakage was determined by means of a fluid filtration method at a pressure of 20 cm H2O. Leakage was measured before root resection, and after 3, 4, 5, and 6 mm apical resections. Data were analyzed by means of a Kruskal-Wallis one-way analysis of variance with P < .05. Results. Fluid leakage was shown to increase after each resection, but did not reach statistical significance (P < .05) until 4 mm of the apex had been removed. Conclusion. The results indicate that root resection did not significantly affect the sealing ability of MTA when at least 3 mm of the MTA remained. Although there was a statistically significant difference in leakage following the 4 mm resection, it is unknown what the biological difference would be between the 3 mm and 4 mm resections.

Original languageEnglish (US)
Pages (from-to)732-735
Number of pages4
JournalOral surgery, oral medicine, oral pathology, oral radiology, and endodontics
Issue number6
StatePublished - Jun 2003

ASJC Scopus subject areas

  • Surgery
  • Oral Surgery
  • Otorhinolaryngology
  • Dentistry(all)


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