Two springs, one goal: which moves crooked canines faster?
NCT ID NCT07826182
First seen Sep 17, 2026 · Last updated Sep 18, 2026 · Updated 1 time
Summary
Researchers compare two orthodontic spring designs, the Poul Gjessing spring and a modified Marcotte spring, for pulling upper canine teeth into proper position after premolar extraction. The study enrolls 20 adults and older teens with crowded teeth who need this treatment. Each participant wears one type of loop on one side of the mouth and the other type on the other side, so the two designs are tested under the same conditions. The team measures how quickly the canine moves and checks other dental changes along the way.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- orthodontic spring loops used to pull canine teeth into place
- What this could lead to
- If one loop moves teeth faster or with less discomfort, orthodontists could shorten treatment time for patients who need canine retraction.
- What could go wrong
- This is a small study of 20 people with specific dental needs, so results may not apply to everyone. Tooth movement varies between people, and neither loop is guaranteed to be faster or more comfortable.
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Study facts
What this study's own registry entry says, in plain language.
- Phase
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Not a phased trial
Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.
- Participants
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About 20 people
The number the study aims to enrol. It can still change while the study runs.
- Expected to start
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Sep 2026
An estimate. Start dates often move.
- Expected to finish
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Dec 2029
An estimate. End dates often move.
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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16 to 25 years
- Sex
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Anyone
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: * Adults aged 16-25 years. * Class I or II div 1 malocclusion with moderate to severe crowding who are indicated for maxillary premolar extraction. * Good oral hygiene and general health. * Full eruption of maxillary permanent canines and second molars. Exclusion Criteria: * Systemic disease affecting bone remodeling eg.DM * Previous extraction of permanent teeth. * Periodontal disease or radiographic evidence of bone loss. * Previous orthodontic treatment. * Craniofacial anomalies or cleft lip and palate. * Skeletal asymmetry. * Orthodontic cases that could be treated with no indication for extraction * Orthodontic cases that are indicated for extraction of any tooth other than maxillary first premolars.
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How to take part
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The official record
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