title: [Effect of resin infiltration treatment on the colour of white spot lesions].
abstract: OBJECTIVE
  This study aimed to evaluate the effect of resin infiltration and fluoride solution on masking different demineralized white spot lesions by assessing color change.
  
  
  METHODS
  Artificial white spot lesions were produced on 60 human molars. Each sample had at least two enamel surfaces opened (named A and B). The samples were randomly divided into groups 1, 2, and 3 according to their time of demineralization (24, 48, and 72 h). After demineralization, the A spot of each sample was treated by resin infiltration. The B spot was treated with 0.1% fluoride solution daily for 30 days. After the remineralization of the B spot, resin infiltration was used again on the B spot of each sample. Color assessment was performed by a spectrophotometer in five distinct stages: baseline, after the production of artificial caries, after resin infiltration of A spots, after 30 days of fluoride solution treatment of B spots, and after resin infiltration of remineralized B spots.
  
  
  RESULTS
  Before demineralization, the L* values of spots A and B in all groups were not significantly different (P > 0.05), whereas the L* values of spots A and B were significantly increased after demineralization. The L* values of A spots recovered significantly after treatment by resin infiltration (P<0.05), but only groups 1 and 2 reached the baseline. The L* values of B spots had no significant differences (P > 0.05) after fluoride treatment compared with that after demineralization. After resin infiltration on B spots, the L* values recovered but could not reach the baseline nor the level of A spots treated by resin infiltration only.
  
  
  CONCLUSIONS
  Resin infiltration is a more effective treatment for masking white spot lesions than traditional fluoride treatment. The effect of masking white spot lesions has certain relationships with the degree of demineralization and activity of the lesion.
authors.forename: Xiaoyi
authors.initials: X
authors.lastname: Zhao
authors.forename: Xuejun
authors.initials: X
authors.lastname: Gao
mesh_terms: D003116:Color; D003731:Dental Caries; D003743:Dental Enamel; D005459:Fluorides; D006801:Humans; D008963:Molar; D010710:Phosphates; D012969:Sodium Fluoride
chemical_list: D010710:Phosphates; C012980:fluorophosphate; D012969:Sodium Fluoride; D005459:Fluorides