The purpose of this study was to observe bone apposition and marginal bone loss and to check a possibility of success on titanium implant, HA coated implant and the implant with natural coral that were placed immediately after teeth extraction in
dogs.
Experimental studies were divided into 4 groups : the 1st group is titanium implant, second the HA coated implant, third the implant with natural coral, and the last the group that was prepared in the extraction sockets.
After 12 weeks, the dogs were sacrificed for visual observatoin and microscopic examination apporaching histologic and histomorphometric analysis.
@ES The results were as follows:
@EN 1. The infection nor the exposure of implant were not found at the sites of the titanium implant and HA coated implant.
2. In a histomorphometric analysis. Mean percentage of direct bone contact with the titanium implant was 80.7% and the HA coated implant showed 81.5% apposition, but significantly the implant with natural coral showed 64.8% apposition(p<0.05).
3. In a microscopic examination, mature lamellated bone was found around the immediate implants and control group, while unabsorbed natural coral around the immediate implants with natural coral was found.
4. All immediate implant groups showed the loss of marginal bone in order from HA coated implant, titanium implant, and implant with natural coral.
5. Implant with natural coral that was placed by the type I interface of the Barzilay's classification immediately after teeth extraction showed low percentage of direct bone contact area, low success rate and a lot of marginal bone loss.
Above results suggested that the immedite implants were osseointegrated successful, although slightly marginal bone was loss.
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