Comparative study of transverse dental changes induced by palatally-buccally applied 2K-loop appliance and palatally applied pendulum appliance
Bibliographic record
Abstract
Introduction: Difference in design of distalization appliances resulted in a difference in dimensions of dental arch after ending of distalization.Objectives: The current study aimed to evaluate transverse dental changes caused by using both 2K-loop and pendulum appliances, and to compare different effects of both appliances using transverse dental measurements.Material and methods: Study group included 16 participants with dental bilateral full cusp or end-to-end class II molar relationship equally divided into two groups.First group, 2K-loop group, consisted of 5 girls and 3 boys (mean age, 10.8 ± 1.2 years) treated with PB applied 2K-loop appliance.Second group, pendulum group included 5 girls and 3 boys (mean age, 11.1 ± 1.1 years) treated with palatally applied pendulum appliance.Study models were taken at the beginning of treatment and at the end of molar distalization.Paired samples t-test was applied to evaluate mean changes during treatment in each group, and to compare measurement differences between the two groups.Results: Statistical analysis of the measurements showed an increase in inter-molar distance of the first molars in the two groups.The increase was significant in the 2K-loop group, with 4.33 ± 0.81 mm, and not significant in the pendulum group (2.19 ± 2.00 mm).There was a significant distal rotation in the upper right first molars of 7.83° ± 2.92°, and 8.66° ± 2.73° on the left with PB 2K-loop appliance.Also, significant mesial rotation on the upper right first molars was observed with 4.83° ± 3.97°, and 4.83° ± 2.71° on the left with palatally applied pendulum appliance.Conclusions: PB acting on 2K-loop appliance causes an increase in the inter-molar distance and distal rotation of maxillary first molars.Palatally acting pendulum appliance results in mesial rotation of maxillary first molars.In cases where maxillary molars need to be de-rotated and to increase inter-molar distance, PB 2K-loop appliance is a better choice.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.006 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".