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KMID : 0362820050240010032
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Journal of the Korean Academy of Implant Dentistry
2005 Volume.24 No. 1 p.32 ~ p.33
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In Vivo Comparison of Calcium Metaphosphate Coated Implant with Machined and Plasma-Sprayed Hydroxyapatite Coated Implants Using Resonance Frequency Analysis and Histomorphometry
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Yeo In-Sung
Chang Jae-Yoon
Han Jung-Suk
Yang Jae-Ho
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Abstract
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Introduction: Purpose of this study was to test for the biocompatibility and histomorphometry of calcium metaphosphate (CMP) coated implant.
Materials and Methods: Screw-type titanium implants manufactured by machining (controls), plasma-sprayed hydroxyapatite (HA) coating and dip-spin CMP coating were placed in the tibiae of 20 New Zealand White rabbits. The bone responses were evaluated and compared by consecutive RFA and histomorphetry.
Results: For consecutive RFA during the healing period of 6 weeks, CMP- and HA-coated implants showed increased implant stability quotient (ISQ) values at initial healing periods (1st and 2nd weeks) and later maintained the values while machined implants showed decreased ISQ values at first week of healing, then following the trend of the coated implants. At first and second weeks of healing, the two coated implants showed significant increase in ISQ values compared with machined implants. There was no significant difference in RFA between CMP- and HAcoated implants. For histomorphometry, both CMP- and HA-coated implants showed significantly higher bone-to-implant contact ratio than machined ones at the second and sixth weeks of healing. No significant difference was found between both of the coated groups in bone-to-implant contact. However, the cracks of the coating layer were observed in HA coated implant sections. The coating layer of HA by plasma-spraying was thicker than that of CMP by dipping and spinning.
Conclusion: CMP-coated implants by dip and spin method showed fast osseointegration and early high stability in the rabbit tibia model. Although further studies are needed, superior initial bone response of CMP-coated implants seems to indicate immediate or early loading. The thin CMP-coating layer is thought to have a lot of advantages plasma-sprayed HA-coating doesn’t have.
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