ReviewMedical journal of the Islamic Republic of Iran2025
Effectiveness of Transpalatal Arch (TPA) in Molar Movement: A Systematic Review and Meta-analysis.
Review in Medical journal of the Islamic Republic of Iran, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Authors and funding
3 authors.
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Abstract
Background: Molar movement control is a fundamental aspect of orthodontic treatment, particularly in managing anchorage and achieving desired occlusal outcomes. The transpalatal arch (TPA) is a commonly used passive or active appliance designed to provide anchorage reinforcement and facilitate specific molar movements. Despite its widespread application, there is limited consensus regarding its quantitative effectiveness. This systematic review and meta-analysis assesses the effectiveness of the TPA in molar movement during orthodontic treatment. Methods: An extensive search of major electronic databases was conducted up to the year 2023 to identify studies evaluating the application of the TPA in molar movement. Data regarding study design, participant characteristics, types of TPA used, and numerical outcomes related to molar displacement were systematically extracted. For each outcome, point estimates and corresponding 95% confidence intervals were computed to assess pre- and post-treatment changes. Results: Fourteen studies underwent detailed qualitative synthesis, with 2 classified as low risk, 7 with some concerns, and 5 as high risk of bias. Nine studies were included in the meta-analysis. The pooled change in mesial movement U6-PTV (mm) for the TPA group was 2.73 (95% CI: 1.90-3.50), vertical movement U6-PP (mm) was 1.24 (95% CI: 0.96-1.52), vertical movement U6-FH (mm) was 1.34 (95% CI: 0.36-2.32), and mesial tipping U6-FH (°) was 2.94 (95% CI: 1.51-4.37). Conclusion: This review underscores the TPA's versatility and effectiveness as an anchorage device. Evaluating TPA's full range of applications, beyond comparisons with skeletal devices, is crucial. Future research should incorporate three-dimensional digital models and consider pubertal growth stages for more accurate assessments.
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Registered trials
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