Evidence map›Paper›PMID 39538283›Full record

ArticleBMC oral health2024

Effect of maxillary molars distalization using clear aligners and fixed orthodontic appliances on the positional and dimensional temporomandibular joint parameters: a three-dimensional comparative study.

Naseem Ali Al-Worafi, Akram Al-Nasri, Leena Ali Al-Warafi, Majedh Abdo Ali Alsomairi, Enas Senan Alyafrusee, Najah Alhashimi, Bowen Zheng, Yi Liu

Abstract readComparative Study
PubMed Full text at PMC Publisher
In one paragraph

Article in BMC oral health, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
6citing papers in PubMed, 1 pooled it
–field-weighted citation impact
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

6 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
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  3. Article
  4. Article
  5. Review
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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

8 authors.

Naseem Ali Al-WorafiDepartment of Orthodontics, School and Hospital of Stomatology, Clinical Medical Research Center of Orthodontic Disease, China Medical University, Shenyang, 110002, China.
Akram Al-NasriHefei Huamei Jiahuai Dental Clinic, Hefei, Anhui, China.
Leena Ali Al-WarafiDepartment of Orthodontics, Faculty of Dentistry, First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.
Majedh Abdo Ali AlsomairiDepartment of Orthodontics, School and Hospital of Stomatology, Clinical Medical Research Center of Orthodontic Disease, China Medical University, Shenyang, 110002, China.
Enas Senan AlyafruseeDepartment of Orthodontics, School and Hospital of Stomatology, Clinical Medical Research Center of Orthodontic Disease, China Medical University, Shenyang, 110002, China.
Najah AlhashimiAssistant Dean for Student Affairs, College of Dental Medicine, Chief of orthodontics division at Hamad Medical Corporation, Qatar University, Doha, Qatar.
Bowen ZhengDepartment of Orthodontics, School and Hospital of Stomatology, Clinical Medical Research Center of Orthodontic Disease, China Medical University, Shenyang, 110002, China. bwzheng@cmu.edu.cn.
Yi LiuDepartment of Orthodontics, School and Hospital of Stomatology, Clinical Medical Research Center of Orthodontic Disease, China Medical University, Shenyang, 110002, China.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

objectiveThe use of clear aligners (CAs) for orthodontic treatment has substantially increased in recent decades. However, limited empirical evidence exists regarding their potential effects on the temporomandibular joint (TMJ). The aim of this study was to assess the effect of maxillary molar distalization on the positional and dimensional TMJ parameters between CAs and conventional fixed orthodontic appliances (FAs) in skeletal class II malocclusion.

methodsThis is a retrospective cohort study examined 70 adult patients with skeletal class II malocclusion with similar baseline characteristics based on American Board of Orthodontics (ABO) discrepancy index scores. The patients were treated by maxillary distalization movement by CAs or FAs, of which there were two equal groups of 35 patients were included in each group. CBCTs on TMJs were performed before and after treatment through Anatomage Invivo Dental 6.0. The measured parameters included inclination, position, condyle and articular fossa dimensions, and the volumetric joint spaces.

resultsIn both groups, linear measurements of the maxillary molar position revealed significant improvement after treatment (P < 0.001). Regarding TMJ parameters, intra-group comparisons revealed significant changes in FA group in the anterioposterior condylar inclination and condylar position across the three planes. Additionally, the pretreatment-centric condylar position in the glenoid fossa was 45.7% and 40% in the CA and FA groups, respectively. After treatment, these percentages changed to 51.4% and 31.4%, respectively. In inter-group comparisons, significant changes were noted in the mediolateral condylar position, which was more inward in the FA group than the CA group.

conclusionThe FA group had more significant dimensional and positional changes in the mandibular condyle than the CA group; nevertheless, the changes are considered clinically negligible.

Indexed as

Malocclusion, Angle Class IIMolarOrthodontic Appliances, FixedTemporomandibular JointTooth Movement TechniquesAdultCone-Beam Computed TomographyFemaleHumansImaging, Three-DimensionalMaleMaxillaOrthodontic Appliance DesignRetrospective StudiesYoung AdultCBCTClass II malocclusionClear alignersConventional fixed appliancesMolar distalizationTemporomandibular joint

Identifiers

PMID39538283
PMCPMC11562603

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Registered trials

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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.