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A HISTOPATHOLOGIC STUDY ON THE PULPAL RESPONSE TO DEMINERALIZED FREEZE-DRIED BONE IN DOGS

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Á¤¹®¿ë/Moon Yong Jung ÀÌâ¼·/ÀÌ»óÈ£/¹ÚÁÖö/Chang Seop Lee/Sang Ho Lee/Joo Chul Park

Abstract

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-Abstract-
The purpose of this study was to investigate the effects of demineralized freeze-dried
bone(DFDB) on mechanically exposed pulp of dong by evaluating the pulpal
inflammation and healing process, formation of dental hard tissue, and structural changes
of fibroblasts of the remaining pulp tissue.
Teeth of 4 dogs, weighing 10§¸, were used in this study. Class V cavities were
prepared followed by exposed the pulp tissue mechanically by sterilized round bur.
In control group, exposed pulps were capped with calcium hydroxide paste followed by
sealed with IRM. In experimental groups, the exposed pulps of one group were capped
with the collagen and those of the other group were capped with DFDB. All cavities
were sealed with same manor as control group.
The animals were sacrificed at the intervals of 3, 7, 14, and 28 days for histopathlogic
evaluation. The specimens were observed by the light microscope and trans-electron
microscope.
The results were as follows :
1. Pulp necrosis was not observed in all groups. Inflammatory response was
disappeared from 1 week in control group and group 2. But it was not disappeared until
2 weeks and also irregular arrangement of odontoblasts was showed at the lateral walls
of root canal just beneath the amputated site of the pulp in group 1.
2. Dentinal bridge was formed incompletely at 2 weeks but it was formed completely
at 4 weeks in control group. Odontoid tissue was also found in control group at 4
weeks from treatment. Amputated site of pulp was incapsulated with fibrous tissue and
odontoblast and dentinal bridge was not found in group 1. Preodontoid tissue and
reparative dentin which were formed by odontoblast differentiated around DFDB were
found, but dentinal bridge was not found in group 2.
3. Cell with large basophillic-stained nuclei infiltrated to amputated site and DFDB at
1 week from treatment in control group and group 2. They were found more in group 2
than in control group. Odontoblasts arranged more regularly and reparative dentin was
found more as time elapsed.
4. Dentin-formative odontoblasts which showed ultramicrostructure of cytoplasm with
polarized nucleus, rEM, Golgi complex, secretory granules, secretion of organic matrix in
control group and group 2.
In regards to above results, the demineralized freeze-dried bone(DFDB) induce
odontoblastic differentiation and further come up to the dentin formation in amputated
pulp.

Å°¿öµå

Ä¡¼öÀý´Ü¼ú; »ó¾ÆÁúÇü¼º; Żȸ³Ãµ¿°ÇÁ¶°ñ; ¼ö»êÈ­Ä®½·; ±³¿øÁú; Pulpotomy; Dentin formation; Demineralized freeze-dried bone(DFDB); Calcium hydroxide; Collagen;

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