Bond strengths to endodontically-treated teeth.
OBJECTIVE
To evaluate the bond strengths of three different types of resin bonding systems to teeth prepared for endodontic treatment.


METHODS
Access cavity preparation and removal of pulpal tissue were performed in bovine incisors. The root canals were chemically irrigated with saline (control), 5% sodium hypochlorite, 3% hydrogen peroxide, or combinations of both for 60 s. After storage in water for 1 d, the dentin surface was ground to a flat surface with 600-grit SiC under water. The area for bonding was demarcated with a vinyl tape (4 mm-in-diameter hole), and bonded using either Clearfil Liner Bond II, Single Bond, or Superbond C&B. After storage in 37 degrees C water for 1 d, tensile bond strengths were measured using a universal testing machine at a crosshead speed of 2 mm/min. Ten teeth were tested for each group.


RESULTS
One-way ANOVA and Fisher's PLSD test revealed that Single Bond and Superbond C&B had a statistically lower (P < 0.05) bond strengths in the chemical irrigation groups compared with the control group.
Nikaido
T
T
Department of Operative Dentistry, Faculty of Dentistry, Tokyo Medical and Dental University, Japan. t.nikaido.odnt@dent.tmd.ac.jp
Takano
Y
Y
Sasafuchi
Y
Y
Burrow
M F
MF
Tagami
J
J
D000818:Animals; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D001896:Boron Compounds / Q000737:chemistry; D002417:Cattle; D001840:Dental Bonding; D003786:Dental Pulp Cavity; D017220:Dentin-Bonding Agents; D006861:Hydrogen Peroxide / Q000737:chemistry; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008768:Methylmethacrylates / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D012388:Root Canal Irrigants / Q000737:chemistry; D012973:Sodium Hypochlorite / Q000737:chemistry; D013718:Tensile Strength; D019553:Tooth, Nonvital
D001896:Boron Compounds; C112274:Clearfil Liner Bond 2; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D008768:Methylmethacrylates; D019279:Resin Cements; D012388:Root Canal Irrigants; C115612:single bond; D017438:Bisphenol A-Glycidyl Methacrylate; C049495:Super-bond; D006861:Hydrogen Peroxide; D012973:Sodium Hypochlorite