Journal of Oral Science Research ›› 2020, Vol. 36 ›› Issue (3): 221-225.DOI: 10.13701/j.cnki.kqyxyj.2020.03.008

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Effect of Pretreatment with EDTA and EDC on Bond Strength of Two-step Self-etching Adhesive

DENG Ting1,2, LIU Min1,2, LIU Wen1,2, WANG Wen1,2, XIE Cuiliu1,2*   

  1. 1. Department of Prosthodontics, the Affiliated Stomatology Hospital of Southwest Medical University, Luzhou 646000, China;
    2. Oral & Maxillofacial Reconstruction and Regeneration Laboratory, Southwest Medical University, Luzhou 646000, China
  • Received:2019-09-02 Online:2020-05-15 Published:2020-05-15

Abstract: Objective: To study the effect of pretreatment with EDTA and EDC on the bond strength of two-step self-etching adhesive. Methods: 56 third molars were randomly divided into 8 groups according the dentin surface treatment and whether or not aging (n=7), group A and A1: Clearfil SE Bond; group B and B1:17% EDTA+Clearfil SE Bond; group C and C1:0.3 mol/L EDC+Clearfil SE Bond; group D and D1:17% EDTA+ 0.3 mol/L EDC+Clearfil SE Bond. Specimens of A1, B1, C1 and D1 were conducted aging test. 5 specimens were randomly selected from each group to test the bond strength and analyze the failure mode. The longitudinal profile morphology of the remaining 2 specimens in each group was observed. Results: Group D had the highest immediate bond strength, and the difference with group A was statistically significant (P<0.05). The difference between group C and C1, group D and D1 was no statistically significant (P>0.05). Mixed fracture was the main failure mode, and the difference was no statistically significant. Resin tags in group B, B1, D and D1 were more and longer than other groups, and no cracks were found in the mixing layer of group C1 and D1. Conclusion: Pretreatment with 17% EDTA+0.3 mol/L EDC can improve immediate dentin bond strength of two-step self-etching adhesive and the adhesion is durable.

Key words: ethylene diamine tetraacetic acid, carbodiimide, dentin, bond strength