Evidence map›Paper›PMID 32299402›Full record

ArticleBMC oral health2020

3D assessment of mandibular skeletal effects produced by the Herbst appliance.

Yi Fan, Paul Schneider, Harold Matthews, Wilbur Eugene Roberts, Tianmin Xu, Robert Wei, Peter Claes, John Clement, Nicky Kilpatrick, Anthony Penington

Open access · goldAbstract read
In one paragraph

Article in BMC oral health, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.

0numbers the graph read from it
0cells of the map it votes in
9citing papers in PubMed
1.6field-weighted citation impact, top 20% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

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.

2 · The registry

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.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

9 citing papers in PubMed, 21 citations in OpenAlex.

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  5. Influence of the force magnitude of fixed functional appliances for class II subdivision 1 treatment-a cephalometric study.Journal of orofacial orthopedics = Fortschritte der Kieferorthopadie : Organ/official journal Deutsche Gesellschaft fur Kieferorthopadie · 2024
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

10 authors at 6 institutions in 5 countries.

Yi FanDepartment of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, 10081, China.
Paul SchneiderMelbourne Dental School, University of Melbourne, Melbourne, 3053, Australia.
Harold MatthewsFacial Science, Murdoch Children's Research Institute, Melbourne, 3052, Australia.
Wilbur Eugene RobertsDepartment of Orthodontics and Oral Facial Genetics, Indiana University-Purdue University Indianapolis, Indianapolis, 46236, USA.
Tianmin XuDepartment of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, 10081, China.
Robert WeiMelbourne Dental School, University of Melbourne, Melbourne, 3053, Australia.
Peter ClaesFacial Science, Murdoch Children's Research Institute, Melbourne, 3052, Australia.
John ClementMelbourne Dental School, University of Melbourne, Melbourne, 3053, Australia.
Nicky KilpatrickFacial Science, Murdoch Children's Research Institute, Melbourne, 3052, Australia.
Anthony PeningtonFacial Science, Murdoch Children's Research Institute, Melbourne, 3052, Australia. Tony.Penington@rch.org.au.
University of Melbourne · AUMurdoch Children's Research Institute · AUIndiana University – Purdue University Indianapolis · USKU Leuven · BEPeking University · CNUniversitair Ziekenhuis Leuven · BE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundA functional appliance is commonly used to optimize the development of the facial skeleton in the treatment of Class II malocclusion. Recent three-dimensional(3D) image-based analysis offers numerous advantages in quantitative measurement and visualization in orthodontics. The aim of this study was to localize in 3D the skeletal effect produced by the Herbst appliance on the mandible using the geometric morphometric technique.

methodsTwenty patients treated with a Herbst appliance and subsequent fixed appliances were included. Cone-beam computed tomography (CBCT) images were taken before treatment (T1), 8 weeks after Herbst appliance removal (T2), and after subsequent fixed appliance treatment (T3). Spatially dense morphometric techniques were used to establish the corresponding points of the mandible. The mandibular morphological changes from T1-T2, T2-T3, and T1-T3 were calculated for each patient by superimposing two mandibular models at two time points with robust Procrustes superimposition. These changes were then compared to the morphological changes estimated from normative mandibular growth curves over the same period. The proportion of cases exceeding the growth expression for controls was compared to a normal population using a one tailed binomial test.

resultsApproximately 1.5-2 mm greater condylar changes and 0.5 mm greater changes in the chin occurred from Tl to T2. This effect lasted until the completion of treatment (T1-T3), but there was no obvious skeletal effect during the orthodontic phase (T2-T3). Approximately 40-50% of the patient sample exceeded condylar growth by > 1.5 mm compared to untreated controls (p < .05). However, changes at the chin were not statistically significant.

conclusionsThe principal skeletal effect of Herbst appliance treatment was additional increase in condylar length for about half of the sample. This inconsistency may relate to the degree of mandibular growth suppression associated with a specific malocclusion.

Indexed as

Orthodontic Appliances, FunctionalAdolescentCephalometryChildCross-Sectional StudiesFemaleHumansMaleMalocclusion, Angle Class IIMandibleRetrospective StudiesClass II malocclusionGeometric morphometricsHerbst appliance

Identifiers

PMID32299402
PMCPMC7164294
OpenAlexW3017200523

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

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.