SynthesisBMC oral health2024
The biomechanical effects of clear aligner trimline designs and extensions on orthodontic tooth movement: a systematic review.
Synthesis in BMC oral health, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT07660809 (Comparison of Patient-Reported Comfort Between Supragingival and Juxtagingival Clear Aligner Trimming-Line Designs), which is not on this map. Cited by 8 papers.
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.
The trial behind it
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.
Comparison of Patient-Reported Comfort Between Supragingival and Juxtagingival Clear Aligner Trimming-Line Designs: A Cross-Sectional, Within-Subject Split-Mouth Study
Who cites it
8 citing papers in PubMed.
- In Vitro Comparison of Initial and 7-Day System-Level Resultant Forces in Clear Aligners with Different Layer Structures.Bioengineering (Basel, Switzerland) · 2026Article
- Direct-printed aligners in orthodontics: Integrating digital design, materials science, and clinical biomechanics.Korean journal of orthodontics · 2026Review
- Retention of orthodontic aligners with different gingival margin designs on three-dimensionally printed models representing varying degrees of marginal tissue recession.Korean journal of orthodontics · 2026Article
- Biomechanical analysis of implant anchorage versus class II elastics in maxillary anterior retraction with clear aligners: a three-dimensional iterative finite element study.BMC oral health · 2026Article
- Effects of attachment design and location on derotation of mandibular second premolars : A finite element analysis.Journal of orofacial orthopedics = Fortschritte der Kieferorthopadie : Organ/official journal Deutsche Gesellschaft fur Kieferorthopadie · 2026Article
- Clear Aligner Therapy Assisted by Implant Anchorage and S-Shaped Root Control Attachments for Anterior Open Bite Correction: A 30-Month Treatment Case Report.Case reports in dentistry · 2026Article
- Three-dimensional pharyngeal airway and hyoid bone changes in skeletal class I malocclusion treated with extraction and non-extraction protocols: a comparative study of fixed orthodontic appliance and clear aligners.Clinical oral investigations · 2025Article
- Finite element analysis of clear aligner with overhanging attachments and extended gingival coverage for interdental space closure.Frontiers in bioengineering and biotechnology · 2025Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
5 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundClear aligner treatment (CAT) has emerged as an effective alternative to conventional multibracket systems in orthodontics. The trimline design and extension of aligners may significantly influence their biomechanical performance and tooth movement efficacy.
aimTo systematically review the biomechanical effects of different aligner trimline designs and extensions on orthodontic tooth movement.
methodsA systematic search was conducted across PubMed, Scopus, Embase, ProQuest Dissertations & Theses Global, and Google Scholar for studies published between January 2000 and August 2024. The review included any types of empirical research focusing on the influence of trimline of orthodontic aligners on tooth movement efficacy conducted between January 2000 and August 2024. The Risk of Bias In Non-randomized Studies of Interventions (ROBINS-I) tool was used for quality assessment.
resultsTwelve studies met the inclusion criteria, all assessed as having low to moderate risk of bias. Aligner trimline design significantly influenced orthodontic tooth movement efficacy through two primary mechanisms: enhanced force delivery and increased aligner retention. Aligners with straight and extended margins generally exerted higher forces and moments compared to scalloped or shorter designs. This resulted in greater tooth displacement for certain movements, particularly intrusion, translation, tipping, and root torquing. Extended trimlines also demonstrated superior retention. However, the effects varied depending on the type of tooth movement.
conclusionAligner trimline designs and extensions can significantly influence biomechanical performance and tooth movement efficacy in CAT. Straight extended trimlines generally demonstrate superior force delivery and retention, leading to more predictable clinical outcomes. This could reduce the need for revisions, thereby decreasing overall treatment time and increasing patient satisfaction. However, further research is needed to investigate the interactions between aligner trimline designs and other factors to develop evidence-based guidelines for their optimal combination in various clinical scenarios.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.