Effect of immediate dentin sealing and temporary cement removal on bond strength of resin cements to dentin

Objective: To evaluate the influence of immediate dentin sealing (IDS) and mechanical methods for removing thetemporary cement on bond strength between resin cements. Material Methods: Bovine incisorswere ground until exposure divided according to two factors: “dentin surface treatment”’ - cleaningwith manual dental excavator (DE), with Robinson bristle brush pumice paste (PP) or IDS application withSingle Bond 2 (IDS/SB+PP) Single Universal (IDS/SBU+PP) plus cleaning PP; “resin cement”- Self-adhesive (RelyX U200) conventional self-etching adhesive (Multilink Automix). Simulatingprovisional restoration, acrylic plates were cemented onto (with without IDS) anon-eugenol temporary cement, stored in distilled water (37 ºC; 7 days). The removed, thedentin was cleaned (PP DE), starch tubes positioned where cementswere applied. After 24 h, specimens submitted a microshear test (wire-loop method). Results: Twowayanalysis variance showed statistically significant dentine treatments (p< 0.001) andresin (p= values. IDS/SBU+PP/U200 (7.24 MPa) IDS/SBU+PP/MULTI (6.40 groups presented higher values when compared DE (DE/U200= 4.60 MPa;DE/MULTI= 1.45 PP (PP/U200= 3.74 MPa; PP/MULTI= 3.14 Statistical difference alsofound cements treatment used U200 > Multilink TheIDS/SBU+PP protocol percentage cohesive failures. micrographs differencesin characteristics among groups. Conclusion: Immediate increased bondstrength only, regardless cement. KEYWORDSCleaning; Dentin sealing; Provisional cement; Resin