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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 Intraoral Ortodontik Braketlerin Manyetik Rezonans Goruntuler Uzerine Etkilerinin Degerlendirilmesi - 3 Tesla'da Bir Kadavra Calismasi Oz Amac: Ortodontik aygitlarin neden oldugu artefaktlar teshis degerini kisitlamaktadir. Manyetik rezonans goruntulemeden once bu aygitlarin cikarilmasi gerekmektedir. Bunula birlikte manyetik kuvvetin buyuklugu ortodontik aygitlardan dolayi olusan artefaktalrin boyutunu etkilemektedir. Bugune kadar, tamamen seramik olan yeni braketlerin olusturabilecegi artefakt boyutu detayli bir sekilde degerlendirilmemistir. Bu calismanin amaci, farkli agiz ici ortodontik braketlerin manyetik rezonans goruntuleme esnasindaki olusturduklari artefaktlari ve olusan isiyi nicel olarak degerlendirmektir. Gerec ve Yontem: Calisma taze bir kadavra kafasi ile yapildi. Uc farkli ortodontik braket (metal / metal-seramik ve seramik seffaf braketler) dislere yapistirildiktan sonra farkli sekanslar kullanilarak 3 Tesla manyetik rezonans cihazinda (3 Tesla Philips Achieva) tarandi. Olusan artefakt alanlari tespit edildi ve MRI taramasindan once ve sonra sicaklik degisimleri de degerlendirildi. Bulgular: En kucuk artefakt capi, sagittal goruntulerde 9,1 mm boyutlarindaydi. Bu artefakt 3D FLAIR sekansinda taranan seramik braketler ile olustu. Celik iceren ortodontik braketler 34,45 mm ila 47,35 mm arasinda degisen artefakt caplarina sahipti. Tarama oncesi ve sonrasi isi acisindan anlamli bir fark bulunmadi (p ≤0.05). Sonuc: Bas ve boyun manyetik rezonans taramasi icin agiz ici ortodontik braketlerin secimi ile bunlarin iceriklerinin ve bu aygitlarin manyetik alandan nasil etkilendiginin bilinmesi hem ortodontistlerin hem de radyologlarin goz onunde bulundurmasi gereken bir durumdur. Anahtar Kelimeler: Manyetik Rezonans Goruntuleme, Isi, Artefakt, Ortodonti, Seramik Braket

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