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An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
Published on: February 10, 2014
Insertion torque, pull-out strength and cortical bone thickness in contact with orthodontic mini-implants at
Thiago Martins Meira1, Orlando Motohiro Tanaka, Maiara Medeiros Ronsani
1* Graduate Dentistry Program, Orthodontics, Pontifical Catholic University of Paraná.
European Journal of Orthodontics
|February 6, 2013
Summary
Inclined orthodontic mini-implants offer superior biomechanical stability. Greater angulation increases insertion torque and cortical bone contact, leading to higher pull-out strength for enhanced orthodontic anchorage.
Area of Science:
- Orthodontics
- Biomaterials Engineering
- Dental Implantology
Background:
- Orthodontic mini-implants are crucial for anchorage.
- Understanding biomechanical behavior is key for optimal placement.
- Mini-implant angulation's effect on stability requires further investigation.
Purpose of the Study:
- To evaluate the biomechanical behavior of inclined orthodontic mini-implants.
- To analyze insertion torque (IT), axial pull-out strength (APS), and cortical bone thickness in contact (CBTC).
Main Methods:
- 102 mini-implants were inserted at 90, 60, and 45 degrees into synthetic bone.
- Insertion torque and axial pull-out strength were measured.
- Cortical bone thickness in contact was analyzed post-pull-out.
Main Results:
- The 45-degree group showed significantly higher insertion torque than the 90-degree group.
- Cortical bone thickness in contact significantly increased across all angulation groups.
- A negative correlation was found between angulation and CBTC (r = -0.95), and a positive correlation between APS and CBTC (r = 0.34).
Conclusions:
- Inclined mini-implant placement enhances insertion torque and cortical bone contact.
- Increased cortical bone contact positively correlates with greater axial pull-out strength.
- Optimal angulation of mini-implants can improve biomechanical stability and anchorage.
