Journal of Oral Science Research ›› 2021, Vol. 37 ›› Issue (4): 344-348.DOI: 10.13701/j.cnki.kqyxyj.2021.04.015

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Effect of Benzalkonium Chloride Modified Adhesive on Long-term Bond Strength of Dentin-resin

MOU Wenbo1, CHENG Yao2, DONG Bo1*   

  1. 1. Department of Dentistry and Endodontics, the Second Affiliated Hospital of Jiamusi University, Jiamusi 154002, China;
    2. Department of Laboratory Medicine, the First Affiliated Hospital of Jiamusi University, Jiamusi 154007, China
  • Received:2020-10-28 Published:2021-04-15

Abstract: Objective: To evaluate the effect of benzalkonium chloride (BAC) modified adhesive on the long-term bond strength of dentin-resin. Methods: BAC was added to the 8th generation single bond universal (SBU) of American 3M to make modified adhesives with different concentrations. One hundred third molars stored in thymol solution were randomly divided into 10 groups (n=10): A and A1 groups: 0.25% BAC; B and B1 groups: 0.5% BAC; C and C1 groups: 1% BAC; D and D1: 2% BAC; and E and E1: control group. The specimens in groups A, B, C, D, and E were subjected to shear strength test (SBS) and the fracture mode was counted. The specimens in groups A1, B1, C1, D1, and E1 were subjected to micro-tensile test (μTBS) and the fracture mode was counted. Results: In the shear strength and micro-tensile strength experiments, the strength of the treatment group was significantly lower than that of the control group (P<0.05). The results of group D and group C were statistically different (P=0.01). Group D1 was statistically significant compared with group B1 and group C1 (P<0.05). The fracture mode was mainly mixed fracture, followed by bonding surface fracture and cohesive fracture. Conclusion: In the full-etching bonding mode, adding benzalkonium chloride to the resin adhesive cannot improve the long-term bonding strength between the dentin and the resin, which may be caused by the damaged physical and chemical properties of the adhesive.

Key words: benzalkonium chloride, matrix metalloproteinases, bonding strength, dentin