title: The effect of ultrasonic post instrumentation on root surface temperature.
abstract: 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 degrees 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.
authors.affiliation: Naval Postgraduate Dental School, Bethesda, Maryland, USA.
authors.forename: Andrew S
authors.initials: AS
authors.lastname: Huttula
authors.forename: Patricia A
authors.initials: PA
authors.lastname: Tordik
authors.forename: Glen
authors.initials: G
authors.lastname: Imamura
authors.forename: Frederick C
authors.initials: FC
authors.lastname: Eichmiller
authors.forename: Scott B
authors.initials: SB
authors.lastname: McClanahan
mesh_terms: D001641:Bicuspid; D001831:Body Temperature / Q000502:physiology*; D002484:Cementation; D006801:Humans; D011176:Post and Core Technique / Q000295:instrumentation; D019279:Resin Cements / Q000737:chemistry; D012389:Root Canal Obturation; D018915:Root Canal Preparation; D013193:Stainless Steel / Q000737:chemistry; D007507:Therapeutic Irrigation; D013821:Thermometers; D013997:Time Factors; D014092:Tooth Root / Q000502:physiology*; D014464:Ultrasonic Therapy / Q000295:instrumentation; D014732:Vibration; D014867:Water / Q000737:chemistry
chemical_list: C438843:Panavia-Fluoro; D019279:Resin Cements; D014867:Water; D013193:Stainless Steel