Bond strengths, degree of conversion of the cement and molecular structure of the adhesive-dentine joint in fibre post restorations.
OBJECTIVE
Because fibre post restorations are influenced by multiple factors such as the types of bonding materials, the dentine region and the time under moist exposure, this study sought to determine the bond strength of endodontic restorations and its relation to the degree of conversion of the cement layer and the molecular structure of the dentine-bonded joints.


METHODS
The performance of 2 etch-and-rinse (All-Bond 2 and One-Step Plus) and 2 self-etch (Clearfil SE Bond and Xeno III) adhesives at post spaces regions, after 7 d or 4 m, was evaluated. FRC Postec Plus posts were cemented to the root canal with a dual-cure resin cement (Duo-Link). Transverse sections of the tooth were subjected to push-out testing, to degree-of-conversion measurements and to hybrid layer evaluation through μ-Raman spectroscopy.


RESULTS
Coronal bonding was higher than cervical and middle bonding. The hybrid layer was thicker for the etch-and-rinse systems, with thicknesses decreasing towards the middle region. The degree of conversion measured for the 3-step etch-and-rinse group after 4 m was significantly higher than that for the self-etching groups.


CONCLUSIONS
Although not totally stable at the adhesive-dentine interface, the 3-step etch-and-rinse adhesive in the coronal dentine provided the best bond strength, degree of conversion of the cement and hybrid layer thickness in post restorations, in both short- and long-term analyses.
Department of Dental Materials and Prosthodontics, São Paulo State University, São José dos Campos, São Paulo, Brazil. marquesdemelo@gmail.com
Renata
R
Marques de Melo
Marco Antonio
MA
Bottino
Roberto Kawakami Harrop
RK
Galvão
Winston O
WO
Soboyejo
D000134:Acid Etching, Dental / Q000379:methods; D002484:Cementation / Q000379:methods; D055598:Chemical Phenomena; D001840:Dental Bonding; D019232:Dental Restoration Failure; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D011176:Post and Core Technique / Q000295:instrumentation*; D019279:Resin Cements / Q000737:chemistry; D013059:Spectrum Analysis, Raman; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors
C103506:Bis-GMA, BPDM, HEMA dental-bonding resin; C438313:Clearfil SE Bond; D017220:Dentin-Bonding Agents; C431350:Duo-Link; D008689:Methacrylates; D019279:Resin Cements; C487957:Xeno III; C100742:All-Bond 2