Journal of the Japanese Association of Regenerative Dentistry
J Jpn Assoc Regenerative Dent_Vol.3(1)_pp.24-40
ISSN 1348-9615


Micro-CT Study of Newly Formed Bone Around Ti Implants with Different Surface Treatment

Hiroshi NAKADA1,8, Taketoshi SUWA2, Yasuko NUMATA2, Yoshimitsu OKAZAKI2, Takeshi MACHIDA1,8, Atsuko GUNJI1,8, Toshiro SAKAE4,8, Tohru HAYAKAWA5,8, Takao KATO6,8, Moriyasu WADA7,8 and Kihei KOBAYASHI1,8
1Department of Gnatho-Oral Prosthetic Rehabilitation, Nihon University School of Dentistry at Matsudo
2Nihon University Graduate School of Dentistry at Matsudo Complete Denture Prosthodontics
3Institute for Human Science and Biomedical Engineering, National Institute of Advanced Industrial Science and Technology
4Department of Histology, Cytology and Development, Nihon University School of Dentistry at Matsudo
5Department of Dental Biomaterials, Nihon University School of Dentistry at Matsudo
6Department of Oral and Maxillofacial Implantology, Nihon University School of Dentistry at Matsudo
7Department of Comprehensive Dentistry for Tooth Reconstruction, Nihon University School of Dentistry at Matsudo
8Research Institute of Oral Science, Nihon University School of Dentistry at Matsudo

In this study, after implant pull-out tests using two kinds of surface treated implants in rabbit femurs, we performed using micro-CT, constitution of 100µn;m internal, structure of trabecular bone and measurement of bone mineral density in rabbit femur. The following results were obtained.
1. Structure of trabecular bone
Newly formed bone around implants was higher after 8 to 24 weeks with blasted than with machined. Although gradual increases in the structure of trabecular bone were observed, no significant differences in the newly formed bone between blasted and machined were detected after 24 weeks.
2. Measurement of the bone mineral density
The Bone mineral density of the newly formed bone gradually increased with both of surface treatment from 4 to 48 weeks. At each weeks, bone mineral density was higher with the blasted implant than with the machined implant.
Surface treatment of implant is factorial one letting control bone density and became clearly factor which had a large influence on bone quantity to acquisition and within 100$micron;m of osteointegration.

Keyword: Implant, Surface treatment, Titanium alloy, Bone mineral density, Micro-CT