The Effect of Ultrasonic Post Instrumentation on Root Surface Temperature

Andrew S. Huttula, Patricia A. Tordik, Glen Imamura, Frederick C. Eichmiller, Scott B. McClanahan

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


This study measured root surface temperature changes when ultrasonic vibration, with and without irrigation, was applied to cemented endodontic posts. Twenty-six, extracted, single-rooted premolars were randomly divided into two groups. Root lengths were standardized, canals instrumented, obturated, and posts cemented into prepared spaces. Thermocouples were positioned at two locations on the proximal root surfaces. Samples were embedded in plaster and brought to 37°C in a water bath. Posts were ultrasonically vibrated for 4 minutes while continuously measuring temperature. Two-way ANOVA compared effects of water coolant and thermocouple location on temperature change. Root surface temperatures were significantly higher (p < 0.001) when posts were instrumented dry. A trend for higher temperatures was observed at coronal thermocouples of nonirrigated teeth and at apical thermocouples of irrigated teeth (p = 0.057). Irrigation during post removal with ultrasonics had a significant impact on the temperature measured at the external root surface.

Original languageEnglish (US)
Pages (from-to)1085-1087
Number of pages3
JournalJournal of Endodontics
Issue number11
StatePublished - Nov 1 2006
Externally publishedYes


  • Heat-induced bone degeneration
  • post removal
  • root surface temperature changes
  • ultrasonics


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