Micro-CT and histologic analyses of bone surrounding immediately loaded miniscrew implants: Comparing compression and tension loading

Susumu NAKAGAKI; Masahiro IIJIMA; Keisuke HANDA; Toshiyuki KOIKE; Yoshitaka YASUDA; Takashi SAITO; Itaru MIZOGUCHI

doi:10.4012/dmj.2013-223

Original Paper

Micro-CT and histologic analyses of bone surrounding immediately loaded miniscrew implants: Comparing compression and tension loading

Susumu NAKAGAKI, Masahiro IIJIMA, Keisuke HANDA, Toshiyuki KOIKE, Yoshitaka YASUDA, Takashi SAITO, Itaru MIZOGUCHI

Author information

Susumu NAKAGAKI
Division of Orthodontics and Dentofacial Orthopedics, Department of Oral Growth and Development, School of Dentistry, Health Sciences University of Hokkaido
Masahiro IIJIMA
Division of Orthodontics and Dentofacial Orthopedics, Department of Oral Growth and Development, School of Dentistry, Health Sciences University of Hokkaido
Keisuke HANDA
Division of Clinical Cariology and Endodontology, Department of Oral Rehabilitation, School of Dentistry, Health Sciences University of Hokkaido
Toshiyuki KOIKE
Division of Clinical Cariology and Endodontology, Department of Oral Rehabilitation, School of Dentistry, Health Sciences University of Hokkaido
Yoshitaka YASUDA
Yasuda Orthodontic Office
Takashi SAITO
Division of Clinical Cariology and Endodontology, Department of Oral Rehabilitation, School of Dentistry, Health Sciences University of Hokkaido
Itaru MIZOGUCHI
Division of Orthodontics and Dentofacial Orthopedics, Department of Oral Growth and Development, School of Dentistry, Health Sciences University of Hokkaido

Keywords: Miniscrew implant, Immediate loading, Micro-CT, BMD

JOURNAL FREE ACCESS

2014 Volume 33 Issue 2 Pages 196-202

DOI https://doi.org/10.4012/dmj.2013-223

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Details

Abstract

This study investigated the effect of immediate force on bone adaptations surrounding miniscrew implants. Ten miniscrew implants were placed on the mandibles in three beagle dogs. Five pairs of miniscrew implants were immediately loaded with 150 g of continuous force using nickel-titanium coil springs for 8 weeks. The values of bone mineral density (BMD), bone mineral content (BMC), and bone volume (BV) of cortical and trabecular bone for compression loading and tension loading were obtained by µCT analysis. The percentages of bone-to-implant contact (BIC) in the compression and tension regions for cortical and trabecular bone were obtained by histologic analysis. The BMD values for the compression region of cortical bone were significantly higher compared to the tension region. The BIC values in cortical and trabecular bone at tension and compression regions were similar. In conclusion, immediate loading does not inhibit osseointegration of miniscrew implants but may stimulate bone mineralization.

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