title: Effect of handpiece pressure and speed on intrapulpal temperature rise.
abstract: This study determined the effect of handpiece pressure and speed on the intrapulpal temperature rise produced during finishing. Finishing was performed on a class V amalgam restoration with a brown rubber point. The remaining dentin thickness was standardized under the restoration at 2.0 mm. Finishing was done continuously for 60 seconds with temperature rises recorded at the dentin/pulp interface every 15 seconds. All finishing was done dry. Handpiece speed (rpm's) varied from 7000-15,000 rpm's and applied pressure from 20-60 gr force. Increases in either speed or pressure can produce significant intrapulpal temperature increases over these ranges. Doubling either one produces a 50% temperature increase during finishing. Finishing at 15,000 rpm's with 60 gr force is capable of producing damaging temperature rises at the pulp after only 15 seconds finishing time.
authors.affiliation: Department of Surgical Specialties, School of Dental Medicine, Southern Illinois University, Alton 62002.
authors.forename: J F
authors.initials: JF
authors.lastname: Hatton
authors.forename: D J
authors.initials: DJ
authors.lastname: Holtzmann
authors.forename: P J
authors.initials: PJ
authors.lastname: Ferrillo
authors.forename: G P
authors.initials: GP
authors.lastname: Stewart
mesh_terms: D000704:Analysis of Variance; D003754:Dental High-Speed Equipment / Q000009:adverse effects*; D003755:Dental High-Speed Technique; D003782:Dental Pulp / Q000293:injuries*; D006358:Hot Temperature; D006801:Humans; D011312:Pressure; D013997:Time Factors