title: Micro-CT and histologic analyses of bone surrounding immediately loaded miniscrew implants: comparing compression and tension loading.
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.
authors.affiliation: Division of Orthodontics and Dentofacial Orthopedics, Department of Oral Growth and Development, School of Dentistry, Health Sciences University of Hokkaido.
authors.forename: Susumu
authors.initials: S
authors.lastname: Nakagaki
authors.forename: Masahiro
authors.initials: M
authors.lastname: Iijima
authors.forename: Keisuke
authors.initials: K
authors.lastname: Handa
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Koike
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Yasuda
authors.forename: Takashi
authors.initials: T
authors.lastname: Saito
authors.forename: Itaru
authors.initials: I
authors.lastname: Mizoguchi
mesh_terms: D000818:Animals; D001863:Bone Screws; D001842:Bone and Bones / Q000033:anatomy & histology*; D015921:Dental Implants; D004285:Dogs; D057893:Immediate Dental Implant Loading; D013314:Stress, Mechanical; D055114:X-Ray Microtomography
chemical_list: D015921:Dental Implants