Evaluation of diamond-coated ultrasonic instruments for root-end preparation

Paul D. Brent, Leslie A. Morgan, J. Gordon Marshall, John (Craig) Baumgartner

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Ultrasonic instrumentation has been associated with cracking of the dentin in the area of the root-end preparation. The purpose of this study was to evaluate root-end preparations for cracking and to describe cavosurface morphology after the use of diamond-coated instruments. Forty teeth were inspected for intradentin cracks, incomplete canal cracks, and complete canal cracks before and after preparation with a stainless steel CT-5 ultrasonic instrument and again after root-end preparation with an S12D/90° diamond-coated instru-ment. Six teeth had polyvinylsiloxane impressions taken of the root ends after preparation with the CT-5 and again after preparation with the diamond-coated instrument. Replicas were made, split, sputter-coated, and inspected using the scanning electron microscope. This study indicates that use of the diamond-coated instrument for root-end preparation does not result in significant root-end cracking and that it can remove cracks created by a prior instrument's use. The use of the diamond-coated instrument resulted in a heavily abraded, debris-covered cavosurface that may affect the apical seal.

Original languageEnglish (US)
Pages (from-to)672-675
Number of pages4
JournalJournal of endodontics
Issue number10
StatePublished - Oct 1999

ASJC Scopus subject areas

  • Dentistry(all)


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