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Updated: Apr 28, 2026
An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
Published on: February 10, 2014
[Comparison between J-hook and micro-implant anchorage in the treatment of patients with bimaxillary protrusion]
Wen-Jing Chen1, Qing-Yi Li, Ai-Xiu Gong
1Department of Orthodontics, Stomatological College of Nanjing Medical University, Nanjing 210029, China.
Objective:
To compare the difference between J-hook and micro-implant anchorage in the treatment of patient with bimaxillary protrusion.
Methods:
Thirty patients with bimaxillary protrusion were divided into two groups (J-hook and micro-implant groups) and treated with MBT appliance. Four first premolars were extracted in all patients. Cephalometric analyses were carried out before and after treatment.
Results:
In J-hook group and micro-implant group,computerized cephalometric analysis revealed that before treatment U6C-PP was (12.4 +/- 0.2) mm and (12.5 +/- 0.1) mm, respectively,and after treatment U6C-PP was (12.6 +/- 0.1) mm and (12.8 +/- 0.1) mm,respectively. The difference between J-hook group and microimplant group was significant (P < 0.01). The other differences of cephalometric analyses between J-hook group and micro-implant group was not significant.
Conclusions:
Both J-hook and micro-implant could provide adequate anchorage in the treatment of patients with bimaxillary protrusion.
