Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effect of Trimetaphosphate and Fluoride Association on Hydroxyapatite Dissolution and Precipitation In Vitro

Full text
Author(s):
Alberto Carlos Botazzo Delbem [1] ; José Antonio Santos Souza [2] ; Ana Carolina Soares Fraga Zaze [3] ; Eliana Mitsue Takeshita [4] ; Kikue Takebayashi Sassaki [5] ; João Carlos Silos Moraes [6]
Total Authors: 6
Affiliation:
[1] UNESP - Univ Estadual Paulista. Araçatuba Dental School - Brasil
[2] UNESP - Univ Estadual Paulista. Araçatuba Dental School - Brasil
[3] Paranaense University. Dental School - Brasil
[4] UFS - Federal University of Sergipe. Dental School - Brasil
[5] UNESP - Univ Estadual Paulista. Araçatuba Dental School - Brasil
[6] UNESP - Univ Estadual Paulista. Engeneering School - Brasil
Total Affiliations: 6
Document type: Journal article
Source: Brazilian Dental Journal; v. 25, n. 6, p. 479-484, 2014-12-00.
Abstract

The present study analyzed the action of sodium trimetaphosphate (TMP) and/or fluoride on hydroxyapatite. Hydroxyapatite powder was suspended in different solutions: deionized water, 500 µg F/mL, 1,100 µg F/mL, 1%TMP, 3%TMP, 500 µg F/mL plus 1%TMP and 500 µg F/mL plus 3%TMP. The pH value of the solutions was reduced to 4.0 and after 30 min, raised to 7.0 (three times). After pH-cycling, the samples were analyzed by X-ray diffraction and infrared spectroscopy. The concentrations of calcium fluoride, fluoride, calcium and phosphorus were also determined. Adding 1% or 3% TMP to the solution containing 500 µg F/mL produced a higher quantity of calcium fluoride compared to samples prepared in a 1,100 µg F/mL solution. Regarding the calcium concentration, samples prepared in solutions of 1,100 µg F/mL and 500 µg F/mL plus TMP were statistically similar and showed higher values. Using solutions of 1,100 µg F/mL and 500 µg F/mL plus TMP resulted in a calcium/phosphorus ratio close to that of hydroxyapatite. It is concluded that the association of TMP and fluoride favored the precipitation of a more stable hydroxyapatite. (AU)

FAPESP's process: 09/09757-1 - Sodium trimetaphosphate (TMP) action on hydroxyapatite (HA) submitted to pH-cycling conditions: infrared spectroscopy, X-ray diffraction and biochemistry analysis
Grantee:José Antonio Santos Souza
Support Opportunities: Scholarships in Brazil - Scientific Initiation