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KMID : 0350519960490020779
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Journal of Catholic Medical College
1996 Volume.49 No. 2 p.779 ~ p.791
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A Histologic and Histomorphometric Evaluation of Hydroxylapatite-Coated and Uncoated Titanium Threaded Implants in the Mandibles of Dogs
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Abstract
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Hydroxylapatite (HA) has been used in the dental field due to its bioactive and biocompatible properties which might have a biochemical bonding with bone. However, it has been used as a coating material to metal substrates, such as titanium or
titanium
alloy implants, because of its weak mechanical strength. The rapid and firm initial bone responses to HA-coated implants have been reported, but rhe long-term effect and the results of HA degradation are controversial. Especially they have not
been
investigated in threaded type HA-coated implants. The authors performed a qualitative and quantitative histological study of bone responses to HA-coated and uncoated titanium threaded fixtures in functionally loaded conditions up to one year in
dogs.
Twenty-four Steri-Oss implants were placed in the mandibles of six adult mongrel dogs. Four months later two-unit fixed bridges were connected to the inserted fixtures. The dogs were killed at one year postfunctionally and the mandibles were
sectioned
into blocks containing the fixtures. The block sections were sawed along the long axis of the implants. One side of the block was processed for undecalcified tissue specimens and underwent histomorphometric analysis. The other side was prepared
for
scanning electron microscopic investigation and implant-to-bone interfaces were evaluated.
@ES The results were as follows;
@EN 1. Both HA-coated and uncoated implants showed good osseointegration responses at implant-to-bone interfaces.
2. The ratio of the direct bone contact to the surface of the HA-coated implants was higher than that of the uncoated implants, which revealed statistically significant differences.
3. There was resorption or loss of coated HA in some areas, but the intimate contact between the surface of the implants and bone was achieved without any inflammatory responeses.
The results from this study demonstrated that the HA-coated implants had better bone responses than the uncoated implants after one year of functional loading.
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KEYWORD
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