| Autor: |
Lasota A; Department of Maxillary Orthopaedics, Medical University of Lublin, 20-093 Lublin, Poland., Gorzelak M; Department of Orthopaedics and Rehabilitation, Medical University of Lublin, 20-059 Lublin, Poland., Turżańska K; Department of Orthopaedics and Rehabilitation, Medical University of Lublin, 20-059 Lublin, Poland., Kłapeć W; Department of Orthopaedics and Rehabilitation, Medical University of Lublin, 20-059 Lublin, Poland., Jarzębski M; Department of Physics and Biophysics, Poznan University of Life Sciences, 60-637 Poznań, Poland., Blicharski T; Department of Orthopaedics and Rehabilitation, Medical University of Lublin, 20-059 Lublin, Poland., Pawlicz J; Department of Orthopedics and Traumatology, Poznan University of Medical Sciences, 28 Czerwca 1956 135/147, 61-545 Poznań, Poland., Wieruszewski M; Department of Mechanical Wood Technology, Faculty of Forestry and Wood Technology, Poznan University of Life Sciences, 60-627 Poznań, Poland., Jabłoński M; Department of Orthopaedics and Rehabilitation, Medical University of Lublin, 20-059 Lublin, Poland., Kuczumow A; ComerLab, Radawiec Duży 196, 21-030 Motycz, Poland. |
| Abstrakt: |
This study primarily focused on the acid erosion of enamel and dentin. A detailed examination of the X-ray diffraction data proves that the products of the acid-caused decay of enamel belong to the family of isomorphic bioapatites, especially calcium-deficient hydroxyapatites. They are on a trajectory towards less and less crystallized substances. The increase in Bragg's parameter d and the decrease in the energy necessary for the changes were coupled with variability in the pH. This was valid for the corrosive action of acid solutions with a pH greater than 3.5. When the processes of natural tooth aging were studied by X-ray diffraction, a clear similarity to the processes of the erosion of teeth was revealed. Scarce data on osteoporotic bones seemed to confirm the conclusions derived for teeth. The data concerning the bioapatite decays were confronted with the cycles of apatite synthesis/decay. The chemical studies, mainly concerning the Ca/P ratio in relation to the pH range of durability of popular compounds engaged in the synthesis/decay of apatites, suggested that the process of the formation of erosion under the influence of acids was much inverted in relation to the process of the formation of apatites, starting from brushite up to apatite, in an alkaline environment. Our simulations showed the shift between the family of bioapatites versus the family of apatites concerning the pH of the reaction environment. The detailed model stoichiometric equations associated with the particular stages of relevant processes were derived. The synthesis processes were alkalization reactions coupled with dehydration. The erosion processes were acid hydrolysis reactions. Formally, the alkalization of the environment during apatite synthesis is presented by introducing Ca(OH) 2 to stoichiometric equations. |
