title: The precision of three enamel biopsy methods for fluoride determination.
abstract: 3 different enamel biopsy methods were tested on 2 maxillary permanent incisors on each of 90 schoolchildren. In methods A and B the round biopsy field was bordered by copalite varnish, while method C utilized a scotch tape border. The biopsy itself resulted from etching the enamel surface with 2N perchloric acid for 7 sec for method A, and 14 sec for methods B and C. Flouride was measured with the fluoride activity electrode. The doubled etching time caused only a 30 to 40% increase of enamel removal. Method C showed the best reproducibility.
mesh_terms: D000293:Adolescent; D001706:Biopsy / Q000379:methods*; D003743:Dental Enamel / Q000032:analysis* / Q000033:anatomy & histology; D004566:Electrodes; D005459:Fluorides / Q000032:analysis*; D006801:Humans
chemical_list: D005459:Fluorides