Effect of resin coating on dentin bond durability of a resin cement over 1 year.
OBJECTIVE
To evaluate the effect of resin coating of bonded dentin on the micro-tensile bond strengths of a resin cement to dentin over 1 year.


METHODS
Human molars were ground to obtain flat dentin surfaces and divided into three groups. The dentin surfaces were left as a control, or resin-coated with a combination of a dentin bonding system, Clearfil SE Bond (SE), and one of two lining materials: Protect Liner F (PLF) (SE/PLF) or Ionosit Micro Spand (IMS). The dentin surfaces with or without resin coating were covered with a temporary filling material (Cavit-G) and stored in water for 1 day. After removal of Cavit-G, an indirect composite block (Estenia) was bonded with Panavia F following the manufacturer's instructions. The specimens were stored in water for 1 day, 6 months or 1 year in 37 degrees C water. Micro-tensile bond strength was measured at a crosshead speed of 1 mm/minute. There were 10 slices each group. Data were analyzed with two-way ANOVA and Fisher's PLSD test (P < 0.05).


RESULTS
ANOVA indicated that resin coating and storage period significantly influenced the micro-tensile bond strengths (P < 0.0001). The bond strengths of SE/PLF, SE/IMS and the control after 1 day were 27.5 +/- 5.1, 15.7 +/- 3.2 and 10.6 +/- 4.9 MPa, respectively. The bond strengths of SE/PLF significantly decreased over 1 year (P < 0.05), while there were no significant differences in bond strengths for SE/IMS (P > 0.05). The bond strengths of SE/PLF were significantly higher than those of the control over 1 year (P < 0.05).
Nikaido
Toru
T
Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University, 5-45 Yushima 1-chome, Bunkyo-ku, Tokyo 113-8549, Japan. nikaido.ope@tmd.ac.jp
Kitasako
Yuichi
Y
Burrow
Michael F
MF
Umino
Ayuko
A
Maruoka
Rena
R
Ikeda
Masaomi
M
Tagami
Junji
J
D020770:Compomers / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D004338:Drug Combinations; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D011140:Polyurethanes / Q000737:chemistry; D011145:Polyvinyls / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry*; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013718:Tensile Strength; D013997:Time Factors; D014867:Water / Q000737:chemistry; D015034:Zinc Oxide / Q000737:chemistry
C438313:Clearfil SE Bond; D020770:Compomers; D003188:Composite Resins; D003738:Dental Cements; D017220:Dentin-Bonding Agents; D004338:Drug Combinations; D008689:Methacrylates; C438843:Panavia-Fluoro; D011140:Polyurethanes; D011145:Polyvinyls; C409388:Protect Liner F; D019279:Resin Cements; C091839:urethanetrimethacrylate; D014867:Water; C020873:Cavit G; D015034:Zinc Oxide