Effect of resin-coating technique on dentin tensile bond strengths over 3 years.
OBJECTIVE
The resin-coating technique has been developed to protect prepared dentin and underlying pulp tissue. The purpose of this study was to evaluate the resin-coated dentin bond durability over a period of 3 years of a resin cement and to compare it with two representative resin cements.


METHODS
Ten bovine dentin specimens were tested for tensile bond strengths with each of the following three materials: CLAPEARL DC with a resin-coating technique (CDRC), Panavia 21 (PA21), and Super Bond C&B (SBCB) at 1 day, 6 months, 1 year, and 3 years. Mean bond strengths were compared statistically by two-way analysis of variance and Fisher's PLSD test (p < .05). The mode of failure was classified by scanning electron microscope observation and analyzed using the Mann-Whitney U-test.


RESULTS
The 3-year bond strengths of all resin cements were significantly lower than those at the other experimental periods except for 1 year (p < .05). There was no significant difference in mean bond strength between CDRC and SBCB (p > .05). Regarding the fracture modes, in the case of CDRC, an increase in adhesive failure at the resin-dentin interface was observed as the time period lengthened. Statistical differences were observed between SBCB and the other materials at 1 year (p < .05) and between PA21 and the other materials at 3 years (p < .05).


CONCLUSIONS
The mean tensile bond strengths of the three resin cements to dentin decreased at different rates during the study; the rate at which the bond decreases is likely to affect the long-term durability of restorations.
Kitasako
Yuichi
Y
Department of Operative Dentistry, Faculty of Dentistry, Tokyo Medical and Dental University, Japan. y.kitasako.odnt@dent.tmd.ac.jp
Burrow
Michael F
MF
Nikaido
Toru
T
Tagami
Junji
J
D000134:Acid Etching, Dental; D000268:Adhesiveness; D000704:Analysis of Variance; D000818:Animals; D001896:Boron Compounds / Q000737:chemistry; D002417:Cattle; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D008689:Methacrylates / Q000737:chemistry; D008768:Methylmethacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D010710:Phosphates / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry*; D013223:Statistics as Topic; D018709:Statistics, Nonparametric; D013499:Surface Properties; D013718:Tensile Strength; D013997:Time Factors; D014783:Viscosity
D001896:Boron Compounds; D003738:Dental Cements; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D008768:Methylmethacrylates; C093719:Panavia TPN-S; D010710:Phosphates; D019279:Resin Cements; C109836:clapearl DC; C049495:Super-bond