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KMID : 0358920000270040524
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Journal of the Korean Academy of Pedodontics
2000 Volume.27 No. 4 p.524 ~ p.534
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Fine structures of physiologic and pathologic root resorption surfaces of deciduous teeth
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Park Youn-Hee
Son Heung-Kyu
Choi Byung-Jai
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Abstract
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Deciduous teeth can be extracted for two reasons, one due to the physiologic resorption and the other by the inflammation at the apex after traumatic injury. Physiologic resorption may be different from pathologic resorption in timing and mechanism. Therefore we resumed the different features of physiologic and pathologic resorption root surfaces.
Many previous studies showed micromorphology of resorbed surface of roots of deciduous teeth. But, few studies compared physiological and pathological root resorption surfaces.
In this study, we carefully observed microscopic morphologies of those two different root surfaces by scanning electron microscope and histologic features by light microscope. The resultant differences between physiologic and pathologic resorption surfaces of deciduous teeth were as follows:
1. The morphology of pathologic resorption lacunae due to inflammation varied in size and shape with irregular boundaries compared with the physiologic areas from scanning electron microscope observations.
2. From light microscope observations, several large resorption fossae containing numerous resorption lacunae were found, whereas the resorption lacunae were irregular in shape with pathologic resorption surface.
3. Numerous multinucleated giant cells were closely attached to the physiologic resorption lacunae, whereas several kinds of mesenchymal cells with numerous inflammatory cells were found in the areas adjacent to the pathologic resorption surface.
4. Light microscope findings showed that compensating cementum formation took place along some of the areas of inflammatory dentinal resorption.
In conclusion, several morphological differences were between physiologic and pathologic root resorption surfaces of human deciduous teeth. The future studies should include cytochemisty to clarify the cellular roles in resorption process observations of pulpal surfaces of coronal and radicular dentin to find the changes that occur in each phase of human deciduous tooth resorption.
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KEYWORD
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Pathologic root resorption, Physiologic root resorption, Scanning electron microscope, Light microscope, Deciduous teeth
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