title: MMP-inhibitory effect of chlorhexidine applied in a self-etching adhesive.
abstract: OBJECTIVE
  To evaluate the MMP-inhibitory effect of chlorhexidine when incorporated in the primer of a two-step selfetching adhesive (Clearfil SE Bond).
  
  
  METHODS
  Powdered dentin made from human teeth was treated with Clearfil SE Bond primers containing chlorhexidine of different concentrations for 20 s or for 2 min. The collagenolytic activity of the dentin powder was assayed using fluorescein-labelled collagen.
  
  
  RESULTS
  Untreated dentin powder contains a low but measurable level of intrinsic activity, which was significantly inhibited by 0.05% chlorhexidine. Treating dentin powder for 20 s with SE Bond primers containing chlorhexidine (0.5%, 1.0%, and 2.0%) reduced the collagenolytic activities by 15.6%, 44.9%, and 56.7% respectively. When treated for 2 min, only SE Bond primer containing 2.0% chlorhexidine could inhibit the collagenolytic activity by 41.1%.
  
  
  CONCLUSIONS
  When incorporated in a two-step self-etching adhesive primer (Clearfil SE Bond primer), chlorhexidine can partially maintain its inhibitory effect on MMPs.
authors: Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, PR of China.
authors: Jianfeng
authors: J
authors: Zhou
authors: Jianguo
authors: J
authors: Tan
authors: Xu
authors: X
authors: Yang
authors: Xuemei
authors: X
authors: Xu
authors: Deli
authors: D
authors: Li
authors: Li
authors: L
authors: Chen