Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
Meta-Analysis
. 2021 Mar:24 Suppl 1:103-112.
doi: 10.1111/ocr.12470. Epub 2021 Feb 8.

Distalization of maxillary molars using temporary skeletal anchorage devices: A systematic review and meta-analysis

Mohamed Bayome  1   2 , Jae Hyun Park  3   4 , Curt Bay  5 , Yoon-Ah Kook  6
Affiliations
Meta-Analysis

Distalization of maxillary molars using temporary skeletal anchorage devices: A systematic review and meta-analysis

Mohamed Bayome et al. Orthod Craniofac Res. 2021 Mar.

Abstract

Objectives: The aim of this systematic review is to assess the treatment effects (amount of distalization, distal tipping and vertical movement) of buccally versus palatally placed temporary skeletal anchorage devices (TSADs) on maxillary first molars during distalization.

Materials and methods: Medline and Scopus databases were searched up to September 2020 for randomized controlled trials (RCTs) and non-randomized prospective cohort studies on maxillary molar distalization using TSADs in patients with Class II malocclusion. After study selection, data extraction and risk of bias assessment, meta-analyses were performed for the amount of distalization, distal tipping and intrusion of first molars.

Results: Nine studies (2 RCTs and 7 prospective studies) were included. The risk of bias of the RCTs was low to unclear. The non-randomized studies were of moderate quality. In five studies, the TSADs were placed in the infrazygomatic process while in two studies, they were placed in the buccal inter-radicular spaces, and in two studies, they were placed in the midpalatal region. The first molar distalization was 2.75 mm when buccal inter-radicular TSADs were used, but 4.07 and 4.17 mm with palatal and infrazgomatic TSADs. The palatal appliances were associated with 11.17° of distal tipping of the first molar while infrazygomatic and buccal inter-radicular TSADs resulted in 3.99° and 1.70° of tipping, respectively.

Conclusions: Inter-radicular TSADs resulted in less distal tipping but also in less distalization. Palatal TSAD-supported appliances showed the greatest amount of distal tipping. Further RCTs or prospective studies on the effect of various designs of TSAD-supported distalization are warranted.

Keywords: distalization; maxillary molars; temporary skeletal anchorage devices.

PubMed Disclaimer

Comment in

  • TSADs special issue.
    [No authors listed] [No authors listed] Orthod Craniofac Res. 2021 Mar;24 Suppl 1:3-4. doi: 10.1111/ocr.12472. Orthod Craniofac Res. 2021. PMID: 33759349 No abstract available.

References

REFERENCES

    1. Soejima U, Motegi E, Nomura M, Yamazaki M, Sueishi K. Change in proportion of extraction and non-extraction in orthodontic patients. Bull Tokyo Dent Coll. 2014;55:225-231.
    1. Chiu PP, McNamara JA Jr, Franchi L. A comparison of two intraoral molar distalization appliances: distal jet versus pendulum. Am J Orthod Dentofacial Orthop. 2005;128:353-365.
    1. Taner TU, Yukay F, Pehlivanoglu M, Cakirer B. A comparative analysis of maxillary tooth movement produced by cervical headgear and pend-x appliance. Angle Orthod. 2003;73:686-691.
    1. Fontana M, Cozzani M, Caprioglio A. Soft tissue, skeletal and dentoalveolar changes following conventional anchorage molar distalization therapy in class II non-growing subjects: a multicentric retrospective study. Prog Orthod. 2012;13:30-41.
    1. Kinzinger GS, Eren M, Diedrich PR. Treatment effects of intraoral appliances with conventional anchorage designs for non-compliance maxillary molar distalization: a literature review. Eur J Orthod. 2008;30:558-571.

LinkOut - more resources