Evidence map›Paper›PMID 33691678›Full record

SynthesisBMC oral health2021

Effects of mouth breathing on facial skeletal development in children: a systematic review and meta-analysis.

Ziyi Zhao, Leilei Zheng, Xiaoya Huang, Caiyu Li, Jing Liu, Yun Hu

Open access · goldAbstract readMeta-AnalysisSystematic Review
In one paragraph

Synthesis in BMC oral health, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 63 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
63citing papers in PubMed, 2 pooled it
11.8field-weighted citation impact, top 1% 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

63 citing papers in PubMed, 2 syntheses or guidelines pooled it, 108 citations in OpenAlex.

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  14. Multidimensional analysis of the impact of adenoid hypertrophy on pediatric dentofacial and airway structures and construction of a diagnostic model.European archives of oto-rhino-laryngology : official journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery · 2026
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3 more citing papers are in PubMed but not listed here.

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

6 authors at 2 institutions in 1 country.

Ziyi ZhaoThe Affiliated Stomatology Hospital of Chongqing Medical University, No.426 Songshi North Road, Yubei district, Chongqing, 401147, China.
Leilei ZhengThe Affiliated Stomatology Hospital of Chongqing Medical University, No.426 Songshi North Road, Yubei district, Chongqing, 401147, China.
Xiaoya HuangThe Affiliated Stomatology Hospital of Chongqing Medical University, No.426 Songshi North Road, Yubei district, Chongqing, 401147, China.
Caiyu LiThe Affiliated Stomatology Hospital of Chongqing Medical University, No.426 Songshi North Road, Yubei district, Chongqing, 401147, China.
Jing LiuThe Affiliated Stomatology Hospital of Chongqing Medical University, No.426 Songshi North Road, Yubei district, Chongqing, 401147, China.
Yun HuThe Affiliated Stomatology Hospital of Chongqing Medical University, No.426 Songshi North Road, Yubei district, Chongqing, 401147, China. 500188@hospital.cqmu.edu.cn.
Chongqing Medical University · CNStomatology Hospital · CN

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundMouth breathing is closely related to the facial skeletal development and malocclusion. The purpose of this systematic review and meta-analysis was to assess the effect of mouth breathing on facial skeletal development and malocclusion in children.

methodsAn electronic search in PubMed, the Cochrane Library, Medline, Web of Science, EMBASE and Sigle through February 23rd, 2020, was conducted. Inclusion criteria were children under 18 years of age with maxillofacial deformities due to mouth breathing. The risk of bias in nonrandomized studies of interventions (ROBINS-I) tool for controlled clinical trials. The Grading of Recommendation, Assessment, Development and Evaluation (GRADE) approach was used for the quality assessment. The included indicators were SNA, SNB, ANB, SN-OP, SN-PP, PP-MP, SNGoGn, MP-H, 1-NA, 1. NA, 1. NB, 1-NB, Overjet, Overbite, SPAS, PAS, and C3-H. Data concerning the mean difference in mesial molar movement and extent of canine retraction were extracted for statistical analysis. The mean differences and 95% confidence intervals were analyzed for continuous data. Review Manager 5.3, was used to synthesize various parameters associated with the impact of mouth breathing on facial skeletal development and malocclusion.

resultsFollowing full-text evaluations for eligibility, 10 studies were included in the final quantitative synthesis. In Sagittal direction, SNA (MD: - 1.63, P < 0.0001), SNB (MD: - 1.96, P < 0.0001) in mouth-breathing children was lower than that in nasal-breathing children. ANB (MD: 0.90, P < 0.0001), 1. NA (MD: 1.96, P = 0.009), 1-NA (MD: 0.66, P = 0.004), and 1-NB (MD: 1.03, P < 0.0001) showed higher values in children with mouth breathing. In vertical direction, SN-PP (MD: 0.68, P = 0.0050), SN-OP (MD: 3.05, P < 0.0001), PP-MP (MD: 4.92, P < 0.0001) and SNGoGn (MD: 4.10, P < 0.0001) were higher in mouth-breathing individuals. In airway, SPAS (MD: - 3.48, P = 0.0009), PAS (MD: - 2.11, P < 0.0001), and C3-H (MD: - 1.34, P < 0.0001) were lower in mouth breathing group.

conclusionsThe results showed that the mandible and maxilla rotated backward and downward, and the occlusal plane was steep. In addition, mouth breathing presented a tendency of labial inclination of the upper anterior teeth. Airway stenosis was common in mouth-breathing children. Trial registration crd-register@york.ac.uk, registration number CRD42019129198.

Indexed as

Malocclusion, Angle Class IIOverbiteAdolescentCephalometryChildFaceHumansMandibleMouth BreathingChildrenFacial skeletal developmentMeta-analysisMouth breathingSystematic review

Identifiers

PMID33691678
PMCPMC7944632
OpenAlexW3124437793

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.