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Bond strengths to endodontically-treated teeth
T Nikaido1, Y Takano, Y Sasafuchi
1Department of Operative Dentistry, Faculty of Dentistry, Tokyo Medical and Dental University, Japan. t.nikaido.odnt@dent.tmd.ac.jp
Purpose:
To evaluate the bond strengths of three different types of resin bonding systems to teeth prepared for endodontic treatment.
Materials And 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.