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KMID : 0370819940090010023
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Yonsei Journal Dental Science
1994 Volume.9 No. 1 p.23 ~ p.45
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Influence of Early Functional Load on Bone Formation Around Hydroxylatatite-Coated IMZ Implants in Dogs
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Abstract
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The purpose of this study was to investigate the influence of early functional load on the bone formation around osseointegrated titanium implants. 15 HA spray coated IMZ implants were placed into the previously extracted site of both mandibular
premolar areas of five adult dogs. The implants were divided into four groups : the control group was the implant without abutments during the experiment period : the experimental group I was preoladed by connecting the contoured abutment after 6
weeks
of healing : the experimental group III was loaded after 12 weeks of healing : and the mandibulr first molar and surrounding tissues were selected for natural tooth group to compare the implant group. all dogs were injected intravenously
tetracycline,
alizarin red S, and calcein for bone labeling. After the experimental period of 16 weeks, the period of 16 weeks, the dogs were sacrificed and longitudinal and horizontal sections of the bone-implant interface were cut and observed using light
microscope, polarized microscope, fluorescence microscope, image analizer, and EPMA.
@ES The results of this study were as follows:
@EN 1. All implant surfaces were well in contact with bone tissue, but some contact with bone marrow tissue was observed.
2. Bone formation and bone remodeling in the group I pre-loaded after 6 weeks of healing appeared earlier than the control group without functional load, but marginal bone resorption of the buccal crestal bone was observed in the group I.
3. HA particles separated from titanium body and phagocytosis of these particesphages were observed.
4. The morphometric analysis showed no significant differences in bone-implant contact rate among 4 groups.
5. EPMA analysis of calcium and phosphorous content showed no significant differences in the bone around implants among 4 groups.
The result of this study indicated the possibility of the early functional load to the implant using temporary prosthesis. The insufficient bonding strength in bone-to-implant interface and HA resorption by phagocytosis were observed regardless
of
functional load. Therefore, more research of HA coating method is required in future.
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