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KMID : 0370819930080010127
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Yonsei Journal Dental Science
1993 Volume.8 No. 1 p.127 ~ p.148
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AN EXPERIMENTAL STUDY OF THE NEW BONE FORMATION AROUND THE HYDROXYAPATITE COATED IMPLANT INSERTED INTO THE PERIODONTALLY INVOLVED EXTRACTION SOCKET OF DOG
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Abstract
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The purpose of this investigation was to evaluate the effect of the decalcified freeze dried bone (DFDB) and guided tissue regeneration membrane(GTAM) on the new bone formation around the hydroxyapatite coated implant inserted into the
periodontally
involved extraction socket.
Experimental chronic periodontitis was induced by the ligation of orthodontic elastic threads after surgically removed the buccal alveolar bone for creating dehescence defect in the mandibular 3rd, 4th premolars of the mandible of the adult dogs
for
12weeks.
HA coated implants were placed immediately after extraction in the blateral 3rd, 4th premolars.
4 types of procedures were performed on the dehescence defects as follows:
Control : sutured without DFDB and GTAM after placing implant
Experimental I: group which bony defects were filled with DFDB
Experimental II: group which GTAM was place over bony defects
Experimental II : group which bony defects were filled with DFDB and covered with GTAM
Thereafter dogs were sacrificed at the 12 weeks and specimens were prepared for light and fluorescent microscopic evaluation.
@ES The results of this study were as follows:
@EN 1. In dehescence bone defect, new bone formation was minimal in control group but in other 3 groups considerable amount of new bone formation was observed without connective tissue ingrowth with the amount descending order being experimental
III,
experimental II, experimental I.
2. In fluorescent microscopic examinations, new bone formation in the dehescence bone defect mostly had taken place at the initial healing stage after implantation with the rate in descending order being experimental II, experimental III,
experimental
III.
3. Aroud the implant under the dehescence bone defect, osseointegration was observed without inflammation in all experimental groups.
4. In Experimental group II and III, thin connective tissue layer was observed beneath the GTAM.
5. DFDB was not resorbed completely throughout the experimental peirod.
These results indicate that new bone formation in bony defects can be attained by the use of GTAM in immediate implantation. If DFDB is used concurrently with GTAM, new bone formation may be delayed, but adequate width and height of bone
formation
can
be attained. The use of DFDB alone can not result in adequate repair of bony defects.
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