{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,3]],"date-time":"2026-05-03T01:16:29Z","timestamp":1777770989672,"version":"3.51.4"},"reference-count":0,"publisher":"S. Karger AG","license":[{"start":{"date-parts":[[2009,11,13]],"date-time":"2009-11-13T00:00:00Z","timestamp":1258070400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/karger.com\/pages\/terms-and-conditions"},{"start":{"date-parts":[[2009,11,13]],"date-time":"2009-11-13T00:00:00Z","timestamp":1258070400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/karger.com\/pages\/terms-and-conditions"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Caries Res"],"abstract":"<jats:p>A method using an Orion combination electrode (96\u201309) was developed for determining the total fluoride content of soft tooth deposits. The samples were collected by plastic sealers and dried at 105\u00b0 C. After weighing, the sample was dissolved in a small polypropylene tube, positioned inside a larger tube. The dissolution was carried out in 0.2 ml of a mixture of HClO&lt;sub&gt;4&lt;\/sub&gt; and HNO&lt;sub&gt;3&lt;\/sub&gt; at 60\u00b0 C for 2 h. The outer tube contained 0.3 ml NaOH and 1 ml Na&lt;sub&gt;3&lt;\/sub&gt;-citrate. After the soft deposit was dissolved, the contents of the tubes were mixed without opening the sealed outer tube. The final mixture had a pH of 5.8 and the F\u2013\u2013 was determined directly. The recovery was found to be satisfactory. Known amounts of F added to dried deposits of Streptococcus salivarius and to Ca&lt;sub&gt;3&lt;\/sub&gt;(PO&lt;sub&gt;4&lt;\/sub&gt;)&lt;sub&gt;2&lt;\/sub&gt; indicated no F- binding in the solubilized material. Deposits collected from a group of children 5\u20136 days after mouthrinsing with 0.2 % NaF had an average fluoride concentration of 85 ppm F (on dry weight) as compared to 52 ppm F in the control group.<\/jats:p>","DOI":"10.1159\/000259645","type":"journal-article","created":{"date-parts":[[2009,11,13]],"date-time":"2009-11-13T11:53:28Z","timestamp":1258113208000},"page":"243-255","source":"Crossref","is-referenced-by-count":40,"title":["Direct Potentiometric Determination of Fluoride in Soft Tooth Deposits"],"prefix":"10.1159","author":[{"given":"J.M.","family":"Birkeland","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"127","published-online":{"date-parts":[[2009,11,13]]},"container-title":["Caries Research"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/karger.com\/article-pdf\/doi\/10.1159\/000259645","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T16:43:36Z","timestamp":1777481016000},"score":1,"resource":{"primary":{"URL":"https:\/\/karger.com\/article\/doi\/10.1159\/000259645"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2009,11,13]]},"references-count":0,"URL":"https:\/\/doi.org\/10.1159\/000259645","archive":["Portico"],"relation":{},"ISSN":["0008-6568","1421-976X"],"issn-type":[{"value":"0008-6568","type":"print"},{"value":"1421-976X","type":"electronic"}],"subject":[],"published":{"date-parts":[[2009,11,13]]}}}