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Comparison of Alignment Efficiency, Arch Dimensional Changes, and Passive Extraction Space Closure Between
Marium Jamil1, Fareeha Bokhari1, Ayesha Hammad2
1University College of Dentistry, University of Lahore, Lahore, Pakistan, uol.edu.pk.
International Journal of Dentistry
|August 15, 2026
Summary
Self-ligating brackets (SLBs) offer faster early alignment and greater intermolar expansion compared to conventional brackets (CBs). However, differences in intercanine width and space closure were modest, suggesting limited clinical significance for these orthodontic treatments.
Area of Science:
- Orthodontics
- Biomaterials Science
- Dental Technology
Background:
- Self-ligating brackets (SLBs) and conventional brackets (CBs) are widely used in orthodontics.
- Understanding their comparative efficiency in alignment, arch dimensional changes, and space closure is crucial for treatment planning.
Purpose of the Study:
- To compare the alignment efficiency, arch dimensional changes, and passive extraction space closure between SLBs and CBs.
- To evaluate the clinical significance of observed differences in orthodontic treatment outcomes.
Main Methods:
- A randomized controlled trial involving 70 participants with moderate to severe crowding and Class I or II malocclusions requiring premolar extractions.
- Participants were randomly assigned to either CB or SLB groups (n=35 each).
- Alignment, intercanine and intermolar widths, and passive extraction space closure were measured using digital calipers on dental casts over a 9-month period.
Main Results:
- Both bracket types demonstrated significant alignment improvement.
- SLBs showed faster early alignment and greater intermolar expansion in both arches.
- Smaller increases in intercanine width were observed with SLBs, while passive space closure was similar between groups.
Conclusions:
- SLBs provide faster early alignment and greater intermolar expansion compared to CBs.
- Differences in intercanine width and passive space closure were modest and may have limited clinical significance.
- The findings suggest that while SLBs offer some advantages, the overall clinical impact compared to CBs requires careful consideration.