Related Experiment Video
Updated: Jul 14, 2026

Minimally Invasive Treatment for Thoracolumbar Burst Fracture Using Sagittal Alignment Screws and A Trauma Reduction Device
Published on: November 8, 2024
[Insertion of min-screws: with or without pre-drilling?]
Laurent Massif1, Laure Frapier, Jean-Paul Micallef
1Faculté d'odontologie, Département d'Orthodontie, Montpellier I, 545 avenue du Pr Jean-Louis Viala, 34193 Montpellier Cedex 5, France. lmassif@yahoo.fr
Creating a pilot hole before inserting orthodontic mini-screws significantly reduces insertion forces and torque. This pilot hole prevents micro-fractures in the cortical bone, improving mini-screw stability and long-term retention.
Area of Science:
- Orthodontics
- Biomaterials
- Dental Implantology
Context:
- Mini-screws have revolutionized orthodontic anchorage, enabling immediate loading.
- Trans-gingival insertion is typically performed without a pilot hole.
Purpose:
- To investigate the biomechanical effects of creating a pilot hole before mini-screw insertion.
- To determine if a pilot hole influences intraosseous constraints and primary stability.
Summary:
- Creating a pilot hole significantly reduces maximum vertical insertion force (FVM) and screwing torque (CVM).
- These reductions were observed independently of mini-screw diameter (1.6mm and 1.3mm).
- Insertion without a pilot hole caused micro-fractures in the cortical bone surface.
Impact:
- Pilot holes mitigate intraosseous constraints during mini-screw insertion.
- This technique enhances primary stability and long-term maintenance of orthodontic mini-screws.
- Improved surgical technique can lead to better treatment outcomes in orthodontics.
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