Author(s): Tihaček-Šojić Ljiljana
Keywords:X-ray diffraction, substitution, resubstitution, enamel tissue, unit cell parameters.
The main objective of this paper is to determine the possibilites of binding organic molecules to the enamel crystal structure. The experimental study in vivo was performed on maxillar molars in dogs. Time in vivo was 12 months, after which animals were executed. All intact teeth were extracted and the study of the enamel crystal structure was continued in vitro. After treating the enamel tissue with the solution of organic spin marker 4-Amino-Tempo, the follow-up of the changes of values of the apatite crystal unit cell parameters was done by X-ray diffraction. The following conclusions may be reached after evaluation of the obtained results: in addition to the process of diffusion throught the interprysmatic space of the enamel tissue, the organic molecules also play a crucial role in the changes of the crystal grid size, due to binding of organic parts of molecules in the enamel crystal structure. Permanent oscillations of the existing oxygen bonds in the enamel crystal structure have been determined every few weeks and depend on the process of substitution and resubstitution of OH ions by ions from organic and inorganic molecules and various dental materials. The local application of the fluorine based preparations on permanent teeth must be repeated every two months due to breakedown of oxygen bond and resubstitution.
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