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The Establishment of a Murine Maxillary Orthodontic Model

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A processing method for orthodontic mini-screws reuse.

Saeed Noorollahian¹, Shiva Alavi, Mohammad Monirifard

¹Torabinejad Dental Research Center and Department of Orthodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.

Dental Research Journal

|November 20, 2012

Summary

This study introduces a new method for cleaning used orthodontic mini-screws using phosphoric acid and sodium hypochlorite, effectively reducing tissue remnants. The processed mini-screws maintained their mechanical properties, suggesting safe reuse and reduced treatment costs.

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Area of Science:

Orthodontics
Biomaterials Science
Dental Implantology

Background:

Orthodontic mini-screws are crucial for anchorage but their reuse is limited by cost and reprocessing concerns.
Developing effective and safe methods for reprocessing used mini-screws can significantly reduce treatment expenses.

Purpose of the Study:

To introduce and evaluate a novel cleansing method for used orthodontic mini-screws.
To assess the impact of this reprocessing method on the mechanical properties (insertion, removal, and fracture torques) of mini-screws.

Main Methods:

A two-part experimental study evaluated a cleansing protocol involving 37% phosphoric acid and 5.25% sodium hypochlorite.
Part I assessed calcium ion levels as an indicator of tissue remnants on non-processed used, processed used, and control (as-received) mini-screws.

Keywords:

Atomic absorption spectrophotometry Mini-screw fracture torque insertion torque removal torque reuse

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Part II measured insertion, removal, and fracture torques of mini-screws across the same three groups after processing and resterilization.

Main Results:

The novel processing method significantly reduced calcium ion levels on used mini-screws to levels comparable to new ones.
No significant differences were found in insertion, removal, or fracture torques between processed used mini-screws and new ones.
Mechanical properties remained unaffected, indicating the efficacy of the cleansing and resterilization process.

Conclusions:

The proposed method effectively cleans used orthodontic mini-screws, reducing tissue remnants to acceptable levels.
Reprocessing and resterilization do not adversely affect the mechanical integrity of mini-screws.
This method offers a viable option for reusing orthodontic mini-screws, potentially lowering patient costs.