Nanoleakage expression and microshear bond strength in the resin cement/dentin interface.
OBJECTIVE
The aim of this study was to evaluate dentin sealing ability and microshear bond strength of two different resin cements.


METHODS
Resin composite overlays (Estenia C&B) were fabricated and cemented to mid-dentin surfaces with either a self-adhesive resin cement (RelyX Unicem) or a resin cement with a self-etching primer (Panavia F2.0). After 24 h storage in water, the specimens were sectioned, placed into 50% (w/v) ammoniacal silver nitrate solution for 24 h, exposed to photodeveloping solution and observed using FE-SEM and EDS. Percentage distribution of metallic silver particles in the resin cement/dentin interface was calculated using digital image analysis software. In addition, small resin overlay cylinders were also bonded to dentin using either of the resin cements, and their bonding performance was evaluated with the microshear bond strength test. The statistical significance was defined as p ≤ 0.05.


RESULTS
No statistically significant difference was detected in the microshear bond strength between RelyX Unicem and Panavia F2.0 (24.9 ± 4.8 and 26.1 ± 5.3 MPa, respectively, p > 0.05). However, a significant difference was detected in silver particle penetration percentage between RelyX Unicem and Panavia F2.0 (7.4 ± 4.6 and 18.7 ± 8.7 MPa, respectively). The Kruskal-Wallis mean ranks for nanoleakage were 6.8 and 14.2, respectively (p < 0.05).


CONCLUSIONS
While the bond strengths of the two materials were comparable, the self-adhesive resin cement may provide better dentin sealing compared to the self-etching primer resin cement.
Cariology and Operative Dentistry, Department of Restorative Sciences, Gradute School, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan. pmakishi@gmail.com
Patricia
P
Makishi
Yasushi
Y
Shimada
Alireza
A
Sadr
Shenghua
S
Wei
Shizuko
S
Ichinose
Junji
J
Tagami
D000134:Acid Etching, Dental; D003188:Composite Resins / Q000737:chemistry; D003738:Dental Cements / Q000737:chemistry; D003763:Dental Leakage / Q000145:classification*; D003764:Dental Materials / Q000737:chemistry; D003804:Dentin / Q000648:ultrastructure*; D004577:Electron Probe Microanalysis; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D036103:Nanotechnology; D010756:Phosphoric Acids / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry*; D055116:Self-Curing of Dental Resins; D033081:Shear Strength; D016622:Silver Staining; D013314:Stress, Mechanical; D013997:Time Factors; D014867:Water / Q000737:chemistry
C076805:Clearfil Porcelain Bond; C438313:Clearfil SE Bond; D003188:Composite Resins; D003738:Dental Cements; D003764:Dental Materials; C500742:ED Primer II; D008689:Methacrylates; C438843:Panavia-Fluoro; D010756:Phosphoric Acids; D011140:Polyurethanes; C483701:Rely X Unicem; D019279:Resin Cements; C091839:urethanetrimethacrylate; D014867:Water; C030242:phosphoric acid