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An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
Published on: February 10, 2014
Hydroxyapatite orbital implant. A light- and electron-microscopic and immunohistochemical study
1Alfried-Krupp Laboratory, Department of Ophthalmology, University of Bonn, Germany.
Ophthalmology
|March 21, 1998
Summary
Host tissue ingrowth into orbital coral implants involves fibroblasts and myofibroblasts, leading to long-term ossification. This study characterized the cellular components and their interaction with hydroxyapatite structures over time.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Ophthalmology
Background:
- Orbital coral spheres are used as implants.
- Understanding host tissue integration is crucial for implant success.
Purpose of the Study:
- Characterize ingrown host tissue in explanted orbital coral spheres.
- Compare tissue findings at different post-implantation intervals.
- Investigate cellular constituents and their interaction with implant material.
Main Methods:
- Retrospective laboratory study of three explanted orbital coral spheres.
- Light microscopy, transmission electron microscopy, and immunohistochemistry (vimentin, actin, CD-68, CD-34).
- Analysis of specimens at 18.5 months, 2.5 months, and 3 weeks post-implantation.
Main Results:
- Fibrovascular tissue filled coral pores in the 18.5-month specimen.
- Evidence of calcium deposition and new bone formation along hydroxyapatite spicules.
- Immunohistochemistry revealed capillary networks (CD-34), fibroblasts (vimentin), and myofibroblasts (actin).
- Transmission electron microscopy confirmed fibroblasts, myofibroblasts, and proliferating vessels.
Conclusions:
- Orbital coral implant ingrowth involves fibroblasts and actin-positive myofibroblasts.
- Interaction between host tissue and hydroxyapatite promotes long-term ossification.
- Fibrovascular tissue composition and ossification progress over time.
