title: Analysis of heat generation using ultrasonic vibration for post removal.
abstract: This study measured the temperature of the root surface and post during the application of ultrasonic vibration to cemented posts to simulate post removal procedure. Root canal therapy was performed on ten extracted maxillary incisors. A stainless steel Parapost was cemented into each prepared post space. Ultrasonic vibration was applied to the post and temperatures were recorded at the coronal post and the cervical root surface. Data were analyzed with ANOVA using the independent variables of (a) time of ultrasonic application (15, 30, 45 and 60 s) and 2) location (post and root surface). Greater temperature increase was observed at the post (52.6 degrees C, SD 11.1; 82.6 degrees C, SD 20.1; 111.0 degrees C, SD 29.1; 125.3 degrees C, SD 33.2) compared to the root surface (9.5 degrees C, SD 4.6; 17.5 degrees C, SD 4.8; 25.4 degrees C, SD 7.3; 32.2 degrees C, SD 8.1) for each time period, P < 0.001. Ultrasonic application to the post for longer than 15 s generates high temperature on the root surface.
authors.affiliation: University of Louisville School of Dentistry, Louisville, KY, USA. johnt.dominici@med.va.gov
authors.forename: John T
authors.initials: JT
authors.lastname: Dominici
authors.forename: Stephen
authors.initials: S
authors.lastname: Clark
authors.forename: James
authors.initials: J
authors.lastname: Scheetz
authors.forename: Paul D
authors.initials: PD
authors.lastname: Eleazer
mesh_terms: D000704:Analysis of Variance; D001831:Body Temperature; D017005:Dental Debonding / Q000009:adverse effects / Q000379:methods*; D003786:Dental Pulp Cavity / Q000502:physiology*; D003799:Dental Stress Analysis; D020878:Device Removal / Q000009:adverse effects / Q000379:methods; D017276:Friction; D006358:Hot Temperature; D006801:Humans; D007180:Incisor; D011176:Post and Core Technique; D014092:Tooth Root / Q000502:physiology*; D014465:Ultrasonics / Q000009:adverse effects; D014732:Vibration