Fogorvosi szemle, 2005 (98. évfolyam, 1-6. szám)

2005-12-01 / 6. szám

250

FOGORVOSI SZEMLE ■ 98. évf. 6. sz. 2005.

mtsai [13] vizsgálatukban leírtak. A továbbiakban tervezzük a végbement változások reverzibilitásának, a fluoridok hatásának, illetve az időfaktor szerepének vizsgálatát. Ismeretes ugyanis, hogy a fogfehérítés során jelentkező fogérzékenység kezelésére leggyakrabban fluoridokat alkalmaznak. Ezek feltehetően a degradált apatit felületéhez képesek kötődni, illetve a károsodott organikus mátrixon keresztül a zománc mélyebb rétegeibe is eljuthatnak. A hosszabb kezelési idő ugyanakkor feltehetően növeli a változásokat.

Irodalom

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Bistey T, Jenei A, Szondy Zs, Nagy Pl, Hegedűs Cs:

In vitro study of the effects of 10-30 % hydrogen peroxide solutions on the human teeth’s enamel surface

The aim of the present study was to investigate the effects of hydrogen peroxide solutions (10-30%) on the enamel surface and the inner structure of human teeth. Prepared enamel samples were exposed to various concentrations of hydrogen peroxide solutions for one hour. Changes in the enamel were analized by two different methods. The inner structure was studied by the Ellman’s reagent to detect possible changes in the amount of free thiol groups in the remaining organic phase of matured enamel. Surface alterations were imaged by atomic force microscope.

Ellman’s reaction revealed the presence of three groups of free thiols: one with easy, the second one with medium and the third one with difficult accessibility by hydrogen peroxide. Atomic force microscopy revealed severe alterations on the enamel surface after treatment with both low and high concentration of hydrogen peroxide.

Our observations indicated that hydrogen peroxide induced alterations in the surface structure and in the inner phases of mature enamel in both low and high concentrations.

Key words: tooth bleaching, hydrogen peroxide, atomic force microscopy, organic enamel phase, inorganic enamel phase