[Maximum resistance strength of the bone-bonding screw orthodontic anchorage].
OBJECTIVE
To investigate the maximum resistance strength of a new orthodontic anchorage system named bone-bonding screw.


METHODS
Thirty-six self-designed two-section bone-bonding screws were bonded to the surface of tibia in 12 rabbits with N-2-butyl cyanoacrylate. The maximum resistance strength of the screws was tested immediately, 2 weeks, 4 weeks and 8 weeks after bonding, respectively.


RESULTS
The average maximum resistance strengths of the bone-bonding screws immediately, 2 weeks, 4 weeks and 8 weeks after bonding were 11.55 (8.96, 12.73), 6.04 (1.88, 10.57), 2.30 (0, 3.24), and 49.85 (20.70, 66.01) N, respectively. The difference between each group was statistically significant (P < 0.05). The failure rate of the bone-bonding screws was 17% (6/36).


CONCLUSIONS
The maximum resistance strength of the bone-bonding screw could suffice for orthodontics.
Xie
Xian-ju
XJ
Department of Orthodontics, Capital Medical University School of Stomatology, Beijing 100050, China.
Bai
Yu-xing
YX
Lü
Ying
Y
Gao
Wei-min
WM
D000818:Animals; D001863:Bone Screws; D003487:Cyanoacrylates; D003738:Dental Cements; D003799:Dental Stress Analysis; D052280:Orthodontic Anchorage Procedures / Q000295:instrumentation*; D011817:Rabbits
D003487:Cyanoacrylates; D003738:Dental Cements