EVALUATION OF INTRAORAL ORTHODONTIC BRACKETS’ EFFECTS ON MAGNETIC RESONANCE IMAGING –A CADAVERIC STUDY AT 3 TESLA

Year 2020, Volume: 30 Issue: 1, 12 - 19, 15.01.2020

Mehmet Hakan Kurt , Mehmet Eray Kolsuz Ulaş Öz İsmail Hakan Avsever Tuğrul Örmeci Bayram Ufuk Şakul Kaan Orhan

https://doi.org/10.17567/ataunidfd.649475

Cited By: 1

Abstract

Abstract

Aim:
Artifacts caused by orthodontic attachments limit the diagnostic value and lead
to the removal of these appliances before magnetic resonance imaging. The
magnet strength can influence the artifact size due to orthodontic appliances.
Moreover, new (ceramic/clear) brackets have not been detailed evaluated. Hence,
the purpose of this study was to quantitively evaluated the artifacts and heat
due to different intra-oral appliances on Magnetic Resonance Imaging.

Material and Method: The study was based on a fresh cadaver head. Three intra-oral
orthodontic appliances (i.e. metal/metal-ceramic and ceramic clear brackets)
together with metallic wires were scanned in a 3 Tesla magnetic resonance
device (3-Tesla Philips Achieva) using different sequences. Artifact areas were
determined and the temperature elevations were also evaluated before and after
MRI scanning.

Results: The
smallest artifact was produced by Ceramic (clear) Brackets scanned in a 3D
FLAIR sequence with a dimension of 9,1 mm on sagittal images. The steel-containing
orthodontic devices were associated with radius artifacts ranging from 34,45 mm
to 47,35 mm. No significant difference was found for heat before and after
scanning (p ≤0.05).

Conclusion:
As a consequence, the choice of intra-oral orthodontic appliances and awareness
of the composition of appliances together with magnetic interference is crucial
for head and neck magnetic resonance scanning that has to be taken into
consideration by both orthodontic consultants and the radiologists.

 

Key Words: Magnetic Resonance
Imaging, Heat, Artifact, Orthodontics, Ceramic Brackets

İntraoral Ortodontik
Braketlerin Manyetik Rezonans Görüntüler Üzerine Etkilerinin Değerlendirilmesi
- 3 Tesla'da Bir Kadavra Çalışması

Öz

Amaç: Ortodontik aygıtların
neden olduğu artefaktlar teşhis değerini kısıtlamaktadır. Manyetik rezonans
görüntülemeden önce bu aygıtların çıkarılması gerekmektedir. Bunula birlikte
manyetik kuvvetin büyüklüğü ortodontik aygıtlardan dolayı oluşan artefaktalrın
boyutunu etkilemektedir. Bugüne kadar, tamamen seramik olan yeni braketlerin
oluşturabileceği artefakt boyutu detaylı bir şekilde değerlendirilmemiştir. Bu
çalışmanın amacı, farklı ağız içi ortodontik braketlerin manyetik rezonans
görüntüleme esnasındaki oluşturdukları artefaktları ve oluşan ısıyı nicel
olarak değerlendirmektir.

Gereç ve Yöntem: Çalışma taze
bir kadavra kafası ile yapıldı. Üç farklı ortodontik braket (metal /
metal-seramik ve seramik şeffaf braketler) dişlere yapıştırıldıktan sonra  farklı sekanslar kullanılarak 3 Tesla
manyetik rezonans cihazında (3 Tesla Philips Achieva) tarandı. Oluşan artefakt
alanları tespit edildi ve MRI taramasından önce ve sonra sıcaklık değişimleri
de değerlendirildi.

Bulgular: En küçük
artefakt çapı, sagittal görüntülerde 9,1 mm boyutlarındaydı. Bu artefakt 3D
FLAIR sekansında taranan seramik braketler ile oluştu. Çelik içeren ortodontik
braketler 34,45 mm ila 47,35 mm arasında değişen artefakt çaplarına sahipti.
Tarama öncesi ve sonrası ısı açısından anlamlı bir fark bulunmadı (p ≤0.05).

Sonuç: Baş ve boyun
manyetik rezonans taraması için ağız içi ortodontik braketlerin seçimi ile
bunların içeriklerinin ve bu aygıtların manyetik alandan nasıl etkilendiğinin
bilinmesi hem ortodontistlerin hem de radyologların göz önünde bulundurması
gereken bir durumdur.

Anahtar
Kelimeler:
Manyetik Rezonans Görüntüleme, Isı, Artefakt, Ortodonti, Seramik Braket

 

Keywords

Magnetic Resonance Imaging, Heat, Artifact, Orthodontics

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