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Influence of orthodontic appliance-derived artifacts on 3-T MRI movies

Overview of attention for article published in Progress in Orthodontics, February 2018
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Title
Influence of orthodontic appliance-derived artifacts on 3-T MRI movies
Published in
Progress in Orthodontics, February 2018
DOI 10.1186/s40510-018-0204-6
Pubmed ID
Authors

Erika Ozawa, Ei-ichi Honda, Kulthida Nunthayanon Parakonthun, Hiroko Ohmori, Kazuo Shimazaki, Tohru Kurabayashi, Takashi Ono

Abstract

Magnetic resonance imaging (MRI) has been used to study configurations of speech organs in the resting state. However, MRI is sensitive to metals, and numerous types of metallic appliances, most of which have a large magnetic susceptibility, are used in orthodontic treatment and may cause severe artifacts on MRI. We have developed techniques for obtaining MRI movies of the oral region, to evaluate articulatory changes, especially movement of the tongue, palate, and teeth, pre- and post-orthodontic/orthognathic treatment. We evaluated the influence of artifacts caused by orthodontic appliances, including fixed retainers, metal brackets, and wires, on measurements in 3-T MRI movies. Sixteen healthy young adults (nine males, seven females; average age, 27 years) with normal occlusion were recruited. Four types of customized maxillary and mandibular plates were prepared by incorporating one of the following into the plate: (a) nothing, (b) a fixed canine-to-canine retainer, (c) metal brackets for the anterior and molar teeth, or (d) clear brackets for the anterior teeth and metal brackets for molars. A 3-T MRI movie, in segmented cine mode, was generated for each plate condition while participants pronounced a vowel-consonant-vowel syllable (/asa/). The size of the artifact due to the metallic brackets was measured. The face size and orthodontically important anatomical structures, such as the velum, the hard palate, and the laryngeal ventricle, were also measured. A large artifact was observed over the entire oral region around orthodontic appliances, altering regional visibility. The velopharyngeal height was measured as significantly longer in the presence of metal brackets. The maximum artifact size due to a metallic bracket was > 8 cm. Our results show that even if it is possible to obtain the measurements of palate length, nasion to sella, and nasion to basion in individuals wearing metal brackets for molars, the measurements might be affected due to the presence of artifacts. Orthodontic appliances, including metallic materials, sometimes produce significant measurement error in speech evaluation using MRI movies, which often become invisible or distorted by metallic orthodontic appliances. When the distorted image is measured, caution should be exercised, as the measurement may be affected. Based on the study, it is concluded that orthodontists should not necessarily remove all metallic appliances before MRI examination because the influence varies among the appliances and should also know that a significant measurement error in speech evaluation using MRI movie may occur by image distortion caused by metallic artifacts.

Twitter Demographics

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Mendeley readers

The data shown below were compiled from readership statistics for 29 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Unknown 29 100%

Demographic breakdown

Readers by professional status Count As %
Student > Master 5 17%
Researcher 4 14%
Student > Doctoral Student 2 7%
Student > Ph. D. Student 2 7%
Student > Bachelor 1 3%
Other 3 10%
Unknown 12 41%
Readers by discipline Count As %
Medicine and Dentistry 12 41%
Unspecified 1 3%
Computer Science 1 3%
Nursing and Health Professions 1 3%
Psychology 1 3%
Other 1 3%
Unknown 12 41%

Attention Score in Context

This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 20 February 2018.
All research outputs
#9,626,959
of 12,538,691 outputs
Outputs from Progress in Orthodontics
#112
of 182 outputs
Outputs of similar age
#185,811
of 271,234 outputs
Outputs of similar age from Progress in Orthodontics
#4
of 4 outputs
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So far Altmetric has tracked 182 research outputs from this source. They receive a mean Attention Score of 1.8. This one is in the 15th percentile – i.e., 15% of its peers scored the same or lower than it.
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