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Does anchorage loss differ with 0.018-inch and 0.022-inch slot bracket systems?
The Angle Orthodontist
|April 24, 2019
Summary
Orthodontic bracket slot size does not impact maxillary molar anchorage loss. This study found no significant difference in molar movement between 0.018-inch and 0.022-inch slot systems during treatment.
Area of Science:
- Orthodontics
- Dental Materials Science
- Biomechanical Engineering
Background:
- Maxillary molar anchorage is crucial in orthodontic treatment, especially with extractions.
- Fixed appliance systems vary in bracket slot size, potentially affecting treatment outcomes.
- Understanding the influence of slot size on molar stability is essential for effective treatment planning.
Purpose of the Study:
- To compare maxillary first molar anchorage loss between 0.018-inch and 0.022-inch slot fixed appliance systems.
- To determine if bracket slot size influences molar stability during orthodontic treatment requiring premolar extractions.
Main Methods:
- A randomized clinical trial included 74 patients undergoing bilateral maxillary premolar extractions.
- Three-dimensional digital models were used to measure anteroposterior molar position changes.
- Anchorage loss was calculated by comparing pre- and post-treatment molar distances using the third medial rugae point as a reference.
Main Results:
- No significant difference in maxillary molar anchorage loss was found between the 0.018-inch (ALR=3.86mm, ALL=3.30mm) and 0.022-inch (ALR=3.73mm, ALL=3.47mm) slot systems (P = .970).
- This finding remained consistent even when excluding subjects who used anchorage devices (P = .383).
Conclusions:
- Bracket slot size does not influence maxillary molar anchorage loss during orthodontic treatment.
- Clinicians can select either 0.018-inch or 0.022-inch slot systems without compromising molar anchorage.
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