title: Amounts of Sr and Ca eluted from deciduous enamel to artificial saliva related to dental caries.
abstract: This study was performed to elucidate the relationship between dental caries and the levels of Sr and Ca eluted from enamel, and to examine whether these elements are useful as factors to assess caries risk. The available 103 (Sr) and 108 (Ca) samples were obtained among 111 collected deciduous teeth. The healthy regions of enamel were decalcified in artificial saliva at pH 6.2 and 5.5. The eluted levels of these elements from enamel were determined using atomic absorption spectrophotometry. Sr and Ca levels were not affected by the sex nor tooth type. Sr levels of the caries-experienced tooth (CE) group were 2.6-fold (pH 6.2) and 2.2-fold (pH 5.5) higher than those of the sound tooth (ST) group, respectively. Furthermore, the Sr levels were significantly higher in the teeth with treated than in those with untreated caries. Only at pH 6.2 was a significant difference found in Ca levels between the ST and CE groups. In the ST group, at pH 5.5, both the Sr and Ca levels significantly increased when the children had six or more carious teeth. The Sr and Ca elution levels were significantly inhibited in the teeth receiving fluoride application every 3 or 4 months compared to those that were not. These findings indicate that Sr can be an indicator of the acid resistance of teeth, and a useful factor to assess future caries risk.
authors.affiliation: Division of Developmental Stomatognathic Function Science, Department of Growth and Development of Functions, Kyushu Dental College, 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu City 803-8580, Japan.
authors.forename: Ayaka
authors.initials: A
authors.lastname: Enomoto
authors.forename: Toshiko
authors.initials: T
authors.lastname: Tanaka
authors.forename: Shigenori
authors.initials: S
authors.lastname: Kawagishi
authors.forename: Hideaki
authors.initials: H
authors.lastname: Nakashima
authors.forename: Koji
authors.initials: K
authors.lastname: Watanabe
authors.forename: Kenshi
authors.initials: K
authors.lastname: Maki
mesh_terms: D000143:Acids / Q000737:chemistry; D000293:Adolescent; D015415:Biomarkers / Q000032:analysis; D002118:Calcium / Q000032:analysis*; D002648:Child; D002675:Child, Preschool; D003648:Decalcification Technique / Q000379:methods; D003731:Dental Caries / Q000473:pathology*; D003743:Dental Enamel / Q000737:chemistry* / Q000187:drug effects; D005260:Female; D005457:Fluoridation; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008297:Male; D012307:Risk Factors; D012464:Saliva, Artificial / Q000494:pharmacology*; D013054:Spectrophotometry, Atomic; D013324:Strontium / Q000032:analysis*; D014094:Tooth, Deciduous / Q000737:chemistry / Q000187:drug effects*; D014131:Trace Elements / Q000032:analysis
chemical_list: D000143:Acids; D015415:Biomarkers; D012464:Saliva, Artificial; D014131:Trace Elements; D002118:Calcium; D013324:Strontium