Journal of Oral Science Research ›› 2019, Vol. 35 ›› Issue (8): 748-751.DOI: 10.13701/j.cnki.kqyxyj.2019.08.007

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Influence of Pre-phosphoric Acid Etching on Bonding Strength of Two-step Self-etching Adhesives to Enamel

LI Xiuhua1, YU Peng2, TIAN Fucong3, WANG Xiaoyan2*   

  1. 1. The Fifth Department of Peking University School and Hospital of Stomatology, Beijing 100020, China;
    2. Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology, Beijing 100081, China;
    3. Department of Endodontics, Dental College of Georgia Augusta University, Augusta 300912, USA
  • Received:2019-03-05 Online:2019-08-28 Published:2019-08-22

Abstract: Objective: To investigate the effects of phosphoric acid (P) etching pretreatment on the bonding strength of two-step self-etching adhesives SE BOND (SE) and VERSA (VE) to enamel. Methods: 18 fresh and intact bovine incisors were selected and divided into 6 groups according to using pre-phosphoric acid etching and primer (solution ①) or not: SE①+SE②; P+SE①+SE②; P+SE②; VE①+VE②; P+VE①+VE②; P+VE②. The micro-tensile bond strength (MPa) was measured. The enamel samples treated with phosphoric acid, SE① solution, phosphoric acid + SE① solution, VE① solution, and phosphoric acid + VE① solution were observed with SEM. Results: The difference of the microtensile bond strengths of SE①+SE②, P+SE①+SE②, and P+SE② was not statistically significant (P>0.05). The microtensile bond strengths of the P+VE①+VE② group was significantly higher than the VE①+VE② group (P<0.05). The SEM presented a typical honeycomb structure of enamel surface after phosphoric acid treatment. However, SE① solution and VE① solution did not change the enamel surface obviously, which was covered by the smear layer. Conclusion: Phosphoric acid pretreatment improves the microtensile bond strength of VE to enamel. When phosphoric acid pretreatment was applied on enamel surface, primer (solution ①) still be recommended.

Key words: two-step self-etching adhesive, enamel, bond strength, phosphoric acid