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Safe placement techniques for self-drilling orthodontic mini-implants.

R Tachibana¹, M Motoyoshi, A Shinohara

¹Department of Orthodontics, Nihon University School of Dentistry, Tokyo, Japan.

International Journal of Oral and Maxillofacial Surgery

|July 6, 2012

Summary

Excessive placement torque for self-drilling orthodontic mini-implants in thick mandibular bone can be avoided. Pre-drilling a 1.3 mm pilot hole significantly reduces torque and prevents bone damage.

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Area of Science:

Orthodontics
Biomaterials Engineering
Surgical Techniques

Background:

Self-drilling mini-implants are increasingly utilized for orthodontic anchorage.
Excessive placement torque is a concern, particularly in dense mandibular cortical bone.
High torque can lead to complications such as cortical bone damage.

Purpose of the Study:

To investigate a safe self-drilling mini-implant placement technique.
To determine optimal placement torque for orthodontic mini-implants.
To evaluate methods for preventing excessive torque in mandibular bone.

Main Methods:

Mini-implants were placed in porcine rib bone models (thin: 1.2 mm, thick: 2.0 mm) using self-drilling and pre-drilling techniques.
Peak placement torque was measured for each method.

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Histological analysis assessed surrounding cortical bone integrity.

A 1.3 mm pilot hole was tested in conjunction with the 1.6 mm self-drilling mini-implant.

Main Results:

In the thick mandibular bone model, both self-drilling and pre-drilling methods often exceeded 10 N cm torque.
A 1.3 mm pilot hole significantly reduced placement torque below the critical threshold.
Histology showed cortical bone cracks in specimens with torque values ≥ 10 N cm.

Conclusions:

Placing 1.6 mm diameter self-drilling mini-implants in mandibular alveolar bone requires careful technique.
Pre-drilling a 1.3 mm pilot hole is recommended to manage placement torque.
This technique minimizes the risk of cortical bone damage during orthodontic mini-implant placement.