title: Evaluation of retention of post-core system cemented with different materials on dentine surfaces treated with EDTA or Er:YAG laser irradiation.
abstract: OBJECTIVE
  The aim of this study was to evaluate in vitro the post-core system retention to dentine surfaces treated with EDTA and Er:YAG laser irradiation and cemented with resin or a tradiational zinc phosphate cement.
  
  
  BACKGROUND
  One of the factors related to intracanal post-retention is the root canal wall preparation.
  
  
  METHODS
  Forty-eight samples were divided into three groups: (1) G1 (control), dentine surfaces with no treatment, irrigated with distilled and deionized water; (2) G2, 1% NaCIO + 17% EDTA; and (3) G3, water and Er:YAG laser (8 Hz, 200 mJ, 60 J, 300 pulses). Each group was subdivided into two subgroups depending on the cement used: Panavia F or zinc phosphate. All specimens were submitted to tensile load in the Universal Instron Machine (Instron 4444) at 0.5 mm/min.
  
  
  RESULTS
  Data were analyzed statistically with ANOVA and Tukey's test, which showed no significant difference (p > 0.01) between the dentine wall treatments performed with 1% NaCIO + 17% EDTA (6.80 Mpa) and water + Er:YAG laser (6.81 MPa), independent of the cement used; however, these were statistically different (p < 0.01) from the control group that presented the lowest values (4.82 MPa). Cementing with Panavia F and zinc phosphate presented similar results for adhesive resistance (p > 0.05).
  
  
  CONCLUSIONS
  We conclude that the previous treatment of dentine walls with 1% NaCIO + 17% EDTA, or Er:YAG laser + water favored retention of the post-core system cemented with both resin and zinc phosphate cement.
authors.affiliation: School of Dentistry, University of Ribeirão Preto, UNAERP, Ribeirão Preto, Brazil.
authors.forename: Edson
authors.initials: E
authors.lastname: Alfredo
authors.forename: Jacy Ribeiro Carvalho
authors.initials: JR
authors.lastname: Júnior
authors.forename: Yarateresinha
authors.initials: Y
authors.lastname: Silva-Sousa
authors.forename: Louren O Correr
authors.initials: LO
authors.lastname: Sobrinho
authors.forename: Paulo Cesar
authors.initials: PC
authors.lastname: Saquy
authors.forename: Manoel Damião
authors.initials: MD
authors.lastname: Sousa-Neto
mesh_terms: D001840:Dental Bonding; D003738:Dental Cements; D017268:Dental Prosthesis Retention; D006801:Humans; D007834:Lasers; D008422:Materials Testing; D011176:Post and Core Technique
chemical_list: D003738:Dental Cements