title: [Maximum resistance strength of the bone-bonding screw orthodontic anchorage].
abstract: 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.
authors.affiliation: Department of Orthodontics, Capital Medical University School of Stomatology, Beijing 100050, China.
authors.forename: Xian-ju
authors.initials: XJ
authors.lastname: Xie
authors.forename: Yu-xing
authors.initials: YX
authors.lastname: Bai
authors.forename: Ying
authors.initials: Y
authors.lastname: Lü
authors.forename: Wei-min
authors.initials: WM
authors.lastname: Gao
mesh_terms: D000818:Animals; D001863:Bone Screws; D003487:Cyanoacrylates; D003738:Dental Cements; D003799:Dental Stress Analysis; D052280:Orthodontic Anchorage Procedures / Q000295:instrumentation*; D011817:Rabbits
chemical_list: D003487:Cyanoacrylates; D003738:Dental Cements