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ABSTRACT
Histopathological observation of root resorption surface of maxillary primary central incisor
Hyejin Na
Department of Dentistry The Graduate school Yonsei University
(Directed by Professor Byung Jai, Choi, D.D.S., Ph.D.)
Deciduous teeth exfoliated by physiologic root resorption, which process is still unclear. Root resorption seems to be regulated by the eruption force of a permanent successor, but primary teeth without successor can be resorbed. Local and general factors have been attributed to pathologic root resorption, which occurs by injuries to the periodontal ligament or dental pulp tissue due to trauma, dental caries. Pathologic root resorption different from physiolosic root resorption in timing and mechanism, therefore we resumed the different features of physiologic and pathologic resorption root surface.
In this study, we carefully observed microscopic morphologies of root resorption surface at physiologic and pathologic resorption due to trauma and due to periapical inflammation by scanning electron microscope and histologic features by light microscope. The resultant differences were as follows:
1. The morphology of physiologic resorption lacunae was shallow and oval or circular shape with regularities.
2. The morphology of pathologic resorption lacunae due to trauma and due to inflammation was deep and polygonal shape with irregularities compared with the physiologic resorption lacunae.
3. Multinucleated giant cells and mononuclear cells were closely attached to the physiologic and pathologic resorption lacunae, whereas several kinds of mesenchymal cells with numerous inflammatory cells were found in the areas adjacent to the pathologic resorption surface.
4. Compensating cementum formation took place along some of the areas of physiologic and pathologic resorption due to trauma, but could not showed on pathologic resorption due to periapical inflammation.
Keyword: physiologic root resorption, pathologic root resorption, maxillary primary central incisor