title: [Prevention of enamel demineralization adjacent to orthodontic brackets bonded with resin-modified glass ionomer: an in vitro pH cycling study].
abstract: OBJECTIVE
  To investigate the resin-modified glass ionomer cement for inhibition of enamel demineralization adjacent to orthodontic brackets under a pH cycling experiment.
  
  
  METHODS
  The study used 5 pairs of extracted human premolars. The experiment teeth were bonded with resin-modified glass ionomer, the control teeth were bonded with composite resin. All samples were under the pH cycling experiment each day for 60 days. Demineralization lesions of enamel adjacent to orthodontic brackets were evaluated with polarized light microscopy. The depth and area of the lesion, and the distance between the edge of the adhesive on the enamel surface and the border of the lesion were measured.
  
  
  RESULTS
  The depth and area of lesions of control were greater than those of experiment group were. Paired t test showed significant differences (p < 0.001). There was always a distance between the lesions border and the glass ionomer cement. In control group, all lesions were developed under the edge of composite resin.
  
  
  CONCLUSIONS
  It was suggested that resin-modified glass ionomer may become an orthodontic bonding agent to minimize enamel demineralization.
authors.affiliation: Department of Orthodontics, Peking University School of Stomatology, Beijing 100081, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Hu
authors.forename: Qin
authors.initials: Q
authors.lastname: Wang
authors.forename: Min-kui
authors.initials: MK
authors.lastname: Fu
authors.forename: Chuo-yue
authors.initials: CY
authors.lastname: Cheng
mesh_terms: D005899:Glass Ionomer Cements / Q000737:chemistry*; D006801:Humans; D066298:In Vitro Techniques; D016910:Orthodontic Brackets / Q000009:adverse effects; D017001:Tooth Demineralization / Q000209:etiology / Q000517:prevention & control*
chemical_list: D005899:Glass Ionomer Cements