title: Influence of ultrasound, with and without water spray cooling, on removal of posts cemented with resin or zinc phosphate cements.
abstract: The efficacy of ultrasound, with and without water spray, was evaluated in vitro on the amount of force necessary to dislodge posts cemented with resin or zinc phosphate. Forty-two samples were divided into six groups: groups 1, 2, and 3, posts cemented with zinc phosphate; groups 4, 5, and 6, posts cemented with resin (Panavia F); groups 1 and 4 (controls), no ultrasound; groups 2 and 5, ultrasound without water spray; and groups 3 and 6, ultrasound with water spray. The Instron testing machine was used. Ultrasound without water spray significantly reduced (71%) the force necessary to displace posts cemented with Panavia F (p < 0.01); however, this value was similar to the efficacy of ultrasound with water spray for posts cemented with zinc phosphate (reduction of 75%). We conclude that cooling with ultrasound interferes with the force necessary for post removal, depending on the type of cement used.
authors.affiliation: Faculty of Dentistry, University of Ribeirão Preto, SP, Brazil.
authors.forename: Angela Delfina Bittencourt
authors.initials: AD
authors.lastname: Garrido
authors.forename: Tabajara Sabbag
authors.initials: TS
authors.lastname: Fonseca
authors.forename: Edson
authors.initials: E
authors.lastname: Alfredo
authors.forename: Yara Teresinha Corrêa
authors.initials: YT
authors.lastname: Silva-Sousa
authors.forename: Manoel D
authors.initials: MD
authors.lastname: Sousa-Neto
mesh_terms: D000704:Analysis of Variance; D003481:Cuspid; D017005:Dental Debonding; D003799:Dental Stress Analysis; D020878:Device Removal / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D011176:Post and Core Technique; D019279:Resin Cements; D018709:Statistics, Nonparametric; D014465:Ultrasonics; D014732:Vibration; D014867:Water; D015036:Zinc Phosphate Cement
chemical_list: C438843:Panavia-Fluoro; D019279:Resin Cements; D014867:Water; D015036:Zinc Phosphate Cement