A new technique for analyzing trace element uptake by human enamel

Abstract

Fluorine (F) and strontium (Sr) are key elements in the de-and remineralization of teeth. To quantitatively analyze the distribution of F and Sr, micro-particle-induced gamma/X-ray emission (PIGE/PIXE) technique was used. The cavities were prepared and filled with the fluoride-and Sr-containing restorative materials (FSCMs) in extracted human molars. The single-section enamel specimens were prepared by slicing from the buccal to lingual surface including the FSCMs. After 5 weeks of automatic pH cycling, the demineralization was calculated by integrated mineral loss (ΔIML) from transverse-microradiography. The distributions of F and Sr were analyzed by the PIGE/PIXE technique. The micro-PIGE/PIXE technique indicated a fluorine uptake difference between the enamel surface and enamel cavity wall. ΔIML of FSCMs were significantly lower than intact enamel. The micro-PIGE/PIXE technique enables measurement of F and Sr uptake from FSCMs into enamel, which would be beneficial for research on caries development and prevention.

Comparison of resin-based and glass ionomer sealants with regard to fluoride-release and anti-demineralization efficacy on adjacent unsealed enamel

“…Interest in the release of strontium from modern glass ionomer materials have been increased 45) . But this study did not perform the analyses of aluminum and strontium in AS and demineralization solution.…”

Incremental distribution of strontium and zinc in great ape and fossil hominin cementum using synchrotron X-ray fluorescence mapping

“…Zinc readily substitutes for calcium in hydroxyapatite and confers greater resistance to acid dissolution [52][53][54][55][56][57]. Moreover, where Zn is present at concentrations >107 ppm, and at low pH (~4.0), it is actively involved in a dissolution/reprecipitation reaction where a new mineral phase ($-hopeite, $-Zn 3 (PO 4 ) 2 .H 2 O) forms on the hydroxyapatite lattice surface, so blocking further demineralisation [58].…”

Estudio de los cambios de la composición química de un ionómero vítreo mediante la técnica de PIXE

“…Estos procesos requieren el estudio de la química y la física de superficies, que son fenómenos diferentes de los del volumen interno, y su estudio por consiguiente, requiere de métodos específicos [21][22][23]. La técnica de PIXE es adecuada para acercarse a este tipo de problemas debido a su capacidad para el análisis de elementos traza en una capa fina de material [21][22][23][24][25]. En este trabajo se estudia el efecto de bebidas de consumo habitual en la composición elemental de un ionómero comercial utilizando dicha técnica.…”