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

Autor(es)

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Dental Journal; v. 25, n. 6, p. 479-484, 2014-12-00.

Resumo

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)

• Processo FAPESP: 09/09757-1 - Ação do trimetafosfato de sódio (TMP) sobre a hidroxiapatita (HA) durante ciclagem de pH: análise pela espectrometria de infravermelho, difração de raio-X e bioquímica
• Beneficiário: José Antonio Santos Souza
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica