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Thread shape factor: evaluation of three different orthodontic miniscrews stability.

Marco Migliorati¹, S Benedicenti, A Signori

¹Orthodontics Department, Genoa University School of Dentistry, Genova, Italy. Marco.Migliorati@unige.it

European Journal of Orthodontics

|January 24, 2012

Summary

This summary is machine-generated.

The thread shape factor (TSF) correlates with the depth and mechanical properties of temporary anchorage devices (TADs). Deeper threads and higher TSF values are linked to increased insertion torque and pull-out strength in bone analogs.

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Area of Science:

Biomaterials Engineering
Orthodontic Technology
Mechanical Testing

Background:

The thread shape factor (TSF) is a novel metric for assessing the geometric characteristics of temporary anchorage devices (TADs).
Understanding the relationship between TAD geometry and mechanical stability is crucial for clinical success.

Purpose of the Study:

To evaluate the correlation between the thread shape factor (TSF) and the mechanical properties (maximum insertion torque and pull-out strength) of three different TADs.
To investigate the influence of TAD thread geometry on insertion and stability in bone analogs.

Main Methods:

In vitro experimental study involving three TAD models (ORTHOImplant, Tomas, Orthoeasy) with varying dimensions.
Scanning electron microscopy (SEM) for TSF measurement.
Maximum insertion torque (MIT) evaluation and pull-out tests on organic bone analogs using a universal testing machine.
Statistical analysis including ANOVA, Bonferroni tests, and Spearman's rank correlation.

Main Results:

Significant direct correlations were observed between TSF and thread depth, as well as between TSF and both pull-out load and MIT.
A strong correlation (0.90, P < 0.001) was found between thread depth and MIT in bone with 2.2 mm cortical thickness.
Mechanical properties were statistically related to thread depth and TSF.

Conclusions:

The thread shape factor (TSF) is a relevant parameter for predicting the mechanical performance of temporary anchorage devices (TADs).
MIT and maximum pull-out load are significantly influenced by the thread depth and TSF of TADs.
These findings suggest that optimizing TAD thread geometry, as quantified by TSF, can enhance stability and predictability in orthodontic applications.