TY - JOUR
T1 - Ultraviolet photofunctionalization increases removal torque values and horizontal stability of orthodontic miniscrews
AU - Tabuchi, Masako
AU - Ikeda, Takayuki
AU - Nakagawa, Kahori
AU - Hirota, Makoto
AU - Park, Wonhee
AU - Miyazawa, Ken
AU - Goto, Shigemi
AU - Ogawa, Takahiro
N1 - Publisher Copyright:
© 2015 American Association of Orthodontists.
PY - 2015/8/1
Y1 - 2015/8/1
N2 - Introduction The objective of this study was to examine the effects of ultraviolet-mediated photofunctionalization of miniscrews and the in-vivo potential of bone-miniscrew integration. Methods Self-drilling orthodontic miniscrews made from a titanium alloy were placed in rat femurs. Photofunctionalization was performed by treating the miniscrews with ultraviolet light for 12 minutes with a photo device immediately before implantation. Maximum insertion torque (week 0), removal torque (weeks 0 and 3), and resistance to lateral tipping force (week 3) were examined. Results The removal torque at 3 weeks of healing was higher for the photofunctionalized screws than for the untreated screws. The regenerated bone tissue was more intact and contiguous around the photofunctionalized miniscrews than around the untreated ones. The miniscrew-bone complex seemed to produce interface failure, not cohesive fracture, in both groups. The displacement of untreated screws under a lateral tipping force was greater than that of photofunctionalized miniscrews. Conclusions These results suggest that photofunctionalization increases the bioactivity of titanium-alloy miniscrews and improves the anchoring capability of orthodontic miniscrews, even without modification of the surface topography.
AB - Introduction The objective of this study was to examine the effects of ultraviolet-mediated photofunctionalization of miniscrews and the in-vivo potential of bone-miniscrew integration. Methods Self-drilling orthodontic miniscrews made from a titanium alloy were placed in rat femurs. Photofunctionalization was performed by treating the miniscrews with ultraviolet light for 12 minutes with a photo device immediately before implantation. Maximum insertion torque (week 0), removal torque (weeks 0 and 3), and resistance to lateral tipping force (week 3) were examined. Results The removal torque at 3 weeks of healing was higher for the photofunctionalized screws than for the untreated screws. The regenerated bone tissue was more intact and contiguous around the photofunctionalized miniscrews than around the untreated ones. The miniscrew-bone complex seemed to produce interface failure, not cohesive fracture, in both groups. The displacement of untreated screws under a lateral tipping force was greater than that of photofunctionalized miniscrews. Conclusions These results suggest that photofunctionalization increases the bioactivity of titanium-alloy miniscrews and improves the anchoring capability of orthodontic miniscrews, even without modification of the surface topography.
UR - http://www.scopus.com/inward/record.url?scp=84938350145&partnerID=8YFLogxK
U2 - 10.1016/j.ajodo.2015.03.022
DO - 10.1016/j.ajodo.2015.03.022
M3 - Article
C2 - 26232836
AN - SCOPUS:84938350145
SN - 0889-5406
VL - 148
SP - 274
EP - 282
JO - American Journal of Orthodontics and Dentofacial Orthopedics
JF - American Journal of Orthodontics and Dentofacial Orthopedics
IS - 2
ER -