1. Enhanced new bone formation in canine maxilla by a graft of electrically polarized β‐tricalcium phosphate
- Author
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Yuichi Izumi, Soichiro Itoh, Miho Nakamura, Takanori Iwata, Tatsuya Akizuki, Kimihiro Yamashita, Munehiro Okada, Shunsuke Fukuba, Kohei Nohara, and Takanori Matsuura
- Subjects
Calcium Phosphates ,Male ,Bone Regeneration ,Materials science ,0206 medical engineering ,Biomedical Engineering ,02 engineering and technology ,Early initiation ,Biomaterials ,Dogs ,Osteogenesis ,Maxilla ,medicine ,Animals ,Bone formation ,β tricalcium phosphate ,021001 nanoscience & nanotechnology ,020601 biomedical engineering ,Sagittal plane ,Transverse plane ,medicine.anatomical_structure ,Bone Substitutes ,Implant ,0210 nano-technology ,Cancellous bone ,Biomedical engineering - Abstract
We succeeded in the electrical polarization of β-tricalcium phosphate (β-TCP) granules and performed an unprecedented attempt to implant them into maxillary bone defects in canines to confirm their ability to facilitate new bone formation. Two holes were drilled into each maxilla half of a canine and filled with electrically polarized and nonpolarized β-TCP granules (grouping assignment was decided randomly). The implanted specimens were dissected en bloc and used for microcomputed tomography (μCT) observations and histological analyses 4 and 8 weeks after the operation. New bone ingrowth in the bone hole progressed over time from the superficial layer of the cortex toward the inner cancellous bone. The percentage area of new bone in the bone hole, as measured by μCT in the sagittal plane, was significantly larger after 4 and 8 weeks, and that measured by H&E-stained specimens in the transverse plane after 4 weeks was significantly larger in the polarized group than in the nonpolarized group. In addition to the structural stability and chemical characteristics of the β-TCP granules, electrical stimulation bears influence not indirectly but directly on osteogenic and vessel cells, which might work cooperatively for the early initiation of the bone formation process.
- Published
- 2020