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Force System with Vertical V-Bends: A 3D In Vitro Assessment of Elastic and Rigid Rectangular Archwires

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Arch perimeter changes with passive self-ligating bracket system: a systematic review and meta analysis.

Nivedha Ramachandran¹, Keerthi Venkatesan², Vignesh Kailasam¹

¹Department of Orthodontics and Dentofacial Orthopaedics, Sri Ramachandra Dental College and Hospital, SRIHER, Chennai, Tamil Nadu, 600116, India.

BMC Oral Health

|May 28, 2025

Summary

This study compared arch perimeter changes using passive self-ligating (PSL) and conventional brackets. Both systems increased arch perimeter, but differences between them were not clinically significant, refuting claims of PSL superiority.

Keywords:

Arch length Arch perimeter Passive self-ligation Self-ligation

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Area of Science:

Orthodontics
Dental Materials Science

Background:

Orthodontic treatment aims to improve dental arch form and stability.
Passive self-ligating (PSL) brackets are claimed to offer advantages over conventional brackets, including enhanced arch perimeter expansion.
Evidence comparing arch perimeter changes between PSL and conventional bracket systems is needed.

Purpose of the Study:

To determine and compare arch perimeter changes with and between passive self-ligating (PSL) and conventional bracket systems.

Main Methods:

A systematic literature search was conducted across six databases up to January 11th, 2025.
Included studies evaluated arch perimeter changes in patients treated with PSL or conventional brackets.
Quality assessment used ROB 2.0 and ROBINS-I tools, with meta-analysis employing a random-effects model.

Main Results:

Twelve studies were identified, with eight included in quantitative analysis.
Both PSL and conventional brackets resulted in arch perimeter increase.
Meta-analysis showed no statistically significant difference in arch perimeter gain between PSL and conventional systems in either the maxillary or mandibular arches.

Conclusions:

Both conventional and self-ligating bracket systems effectively increase arch perimeter.
The differences in arch perimeter changes between these two systems are not clinically or statistically significant.
The hypothesis that self-ligating systems provide a greater increase in arch perimeter is not supported by current evidence.