Evaluation of cracks associated with ultrasonic root-end preparation

Carol A. Layton, J. Gordon Marshall, Leslie A. Morgan, J. Craig Baumgartner

Research output: Contribution to journalArticlepeer-review

84 Scopus citations


The purpose of this study was to evaluate the integrity of resected root-end surfaces of extracted human teeth after using ultrasonic tips at low or high frequencies for root-end preparation. Thirty bilaterally matched pairs of single-rooted human teeth had root-end resections using a low-speed diamond saw and were examined for root-end cracks. The matched pairs of teeth were then divided into two experimental groups, with one member of each pair being placed in each group. In group 1, root-end preparations were made with an ultrasonic tip on the lowest frequency setting. The preparations in group 2 were done on the highest power setting. Two investigators again examined the resected root-ends using a stereomicroscope at ×20 to ×63 and recorded the numbers, types, and location of the cracks. Three types of cracks were observed: canal cracks, intradentin cracks, and cemental cracks. There were significantly more root-ends with cracks after ultrasonic root-end preparation than after root-end resection only. In root-ends that had any cracks, significantly more canal cracks per root occurred when the ultrasonic tip was used on the high-frequency setting for root-end preparation than when the ultrasonic tip was used on the low power setting.

Original languageEnglish (US)
Pages (from-to)157-160
Number of pages4
JournalJournal of endodontics
Issue number4
StatePublished - 1996
Externally publishedYes

ASJC Scopus subject areas

  • Dentistry(all)


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