title: [Relationship between Ca, P and F concentration of plaque residues in the primary teeth and caries status, sugar exposure frequency].
abstract: OBJECTIVE
  To analyze the relationship between inorganic ingredients (Ca, P and F) concentration of plaque residues in the primary teeth and caries status, sugar exposure frequency.
  
  
  METHODS
  Subjects were 93 of 3-5 years old children living in Beijing area. According to their caries status, they were classified into two groups: Severe early childhood caries(S-ECC) group and caries free(CF) group. Plaque samples were collected from subjects respectively. Ca, P and F concentration of plaque residues was measured by atomic absorption spectroscopy, spectrophotometer and fluoride electrode respectively. The information of daily sugar exposure frequency of children was obtained from a standardized questionnaire filled by their parents. The relationship between inorganic ingredients (Ca, P and F) concentration of plaque residues and daily sugar exposure frequency was analyzed and the relationship between inorganic ingredients (Ca, P and F) concentration of plaque residues and caries status in the S-ECC group was also analyzed.
  
  
  RESULTS
  The mean values for Ca, P and F concentration of plaque residues were lower in the S-ECC group, but the difference was not statistically significant (P > 0.05). The daily sugar exposure frequency in the S-ECC group was higher than that in the CF group. There were no relationships between Ca, P and F concentration of plaque residues and caries status (dmft, dmfs), sugar exposure frequency in the primary dentition.
  
  
  CONCLUSIONS
  Plaque residues from CF subjects did not contain a greater pool of calcium, inorganic phosphorus, and fluoride ions than that from S-ECC subjects.
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Shu-Guo
authors.initials: SG
authors.lastname: Zheng
authors.forename: Xiaoling
authors.initials: X
authors.lastname: Wang
mesh_terms: D002118:Calcium; D002241:Carbohydrates; D002648:Child; D002675:Child, Preschool; D003731:Dental Caries; D003733:Dental Caries Susceptibility; D003773:Dental Plaque; D005459:Fluorides; D006801:Humans; D010710:Phosphates; D014094:Tooth, Deciduous
chemical_list: D002241:Carbohydrates; D010710:Phosphates; C012980:fluorophosphate; D005459:Fluorides; D002118:Calcium