Evaluation of artifacts generated by zirconium implants in cone-beam computed tomography images

Vasconcelos, Taruska Ventorini; Bechara, Boulos; McMahan, C. Alex; Freitas, Deborah Queiroz; Noujeim, Marcel

doi:10.1016/j.oooo.2016.10.021

Cited by 53 publications

(71 citation statements)

References 26 publications

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“…6 Ayrıca saçılma ve gürültü de yüksek dansiteli bir objenin varlığında kaydedilen verinin bozulmasına katkıda bulunan etkenlerdendir. [7][8][9] KIBT görüntülerinde artefaktı azaltmak için iteratif rekonstrüksiyon tekniği ya da projeksiyon interpolasyon metodu gibi farklı yaklaşımlar önerilmiştir. 10 Promax (Planmeca, Helsinki, Finland) artefakt redüksiyon algoritması (ARA) belli bir eşik değerden yüksek dansitede olan yapıların düzeltilmesi temeline dayanmaktadır.…”

Section: Discussionunclassified

“…Öte yandan literatürde Zr implantların neden olduğu artefaktlara ve Zr ile Ti implant artefaktlarının karşılaştırılmasına dair kısıtlı sayıda çalışma bulunmaktadır. 7,12,13 Bu çalışmanın amacı, farklı görüntü elde etme para- 12 , Ti ve Zr implantların KIBT'de benzer artefakt oluşturma biçimleri olduğunu rapor etmişlerdir. Bunun aksine Sancho-Puchades ve ark.…”

Section: Discussionunclassified

“…Yüksek SD değerlerinin gürültü ve artefakt yoğunluğu artışı ile ilişkili olduğu bilinmektedir. 7,8,16 Çalışmamızda SD değerleri implant gruplarında kontrol grubuna göre daha yüksek bulunmuştur. Bu durum ARA uygulanmasından bağımsız olarak ışın sertleşmesi ve saçılma ile ilişkili olabilir.…”

Section: Discussionunclassified

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The Effects of Promax Artefact Reduction Algorithm on Artefacts Induced by Titanium and Zirconium Implants

Buyuk¹,

Arsan²,

Erdem³

et al. 2020

Yeditepe J Dent

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Artefaktlar görüntü kalitesini düşürürler. Literatürde titanyum (Ti) ve zirkonyum (Zr) implant artefaktları ile ilgili çalışma sayısı kısıtlıdır. Bu çalışmanın amacı, farklı çekim parametreleri ile ProMax Artefakt Azaltma Algoritması'nın (AAA) konik ışınlı bilgisayarlı tomografi (KIBT) görüntülerinde Ti ve Zr implantların oluşturduğu artefaktlar üzerine olan etkisinin değerlendirilmesi ve karşılaştırılmasıdır. Materyal ve Metod: Bir Zr ve bir Ti implant sığır kaburgasına yerleştirildi. Bu kemik ProMax 3D Mid KIBT cihazı ile tarandı. Görüntüler 70, 76, 80, 86 ve 90 kVp'de, 2 farklı voksel boyutunda (0.2 ve 0.4 mm) elde edildi. AAA kullanılarak ve kullanılmadan 20 çekim yapıldı. Elde edilen görüntüler ImageJ programına aktarıldı. Ortalama gri değeri (GV) ve standart sapma (SD) ile kontrast-gürültü oranı (CNR) hesaplandı. İstatistiksel analizlerde Pearson's korelasyon katsayısı, Student's t-test, ANOVA and multipl regresyon analizi testleri kullanıldı. Bulgular: AAA her iki implant grubunda da SD'yi anlamlı derecede azalttı (p<0.001) ve bu azalma Zr implant için daha yüksekti. Algoritmanın aktivasyonu ile kVp ve Zr implanttaki SD arasında önemli bir negatif korelasyon gözlendi (p<0.05). Her iki implant grubunda da GV ve CNR değerleri anlamlı olarak yükseldi ve bu artış Zr grubunda daha yüksekti (p<0.001). Sonuç: Zr, KIBT görüntülerini Ti'den daha fazla bozmaktadır. Promax cihazının AAA her iki implant grubunda da görüntü kalitesini iyileştirmektedir ve Zr implantlar üzerine etkisi daha yüksektir. Anahtar kelimeler: Konik ışınlı bilgisayarlı tomografi, artefakt, gürültü, zirkonyum, dental implant. SUMMARY Aim: Artefacts reduce image quality. There are a limited number of studies regarding the artefacts of titanium (Ti) and zirconium (Zr) implants. The aim of this study was to evaluate and compare the effects of different acquisition parameters and ProMax artefact reduction algorithm (ARA) on the artefacts caused by Ti and Zr implants in cone beam CT (CBCT) images. Materials and Methods: One Zr and one Ti implant were inserted in a bovine rib. The bone was scanned with Pro-Max 3D Mid CBCT unit. Images were acquired using 70, 76, 80, 86 and 90 kVps at two different voxel sizes (0.2 and 0.4 mm). Twenty scans were obtained with and without using ARA. Acquired images were transferred to Im-ageJ program. Mean gray values (GV) and standard deviations (SD) were recorded and the contrast-noise ratio (CNR) was calculated. Statistical analysis was carried out with Pearson's correlation coefficient, Student's t-test, ANOVA and multiple regression analysis tests. Results: ARA reduced the SDs in both implant groups significantly (p<0.001) and this reduction was higher

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Section: Discussionunclassified

See 1 more Smart Citation

The Effects of Promax Artefact Reduction Algorithm on Artefacts Induced by Titanium and Zirconium Implants

Buyuk¹,

Arsan²,

Erdem³

et al. 2020

Yeditepe J Dent

View full text Add to dashboard Cite

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“…Likewise, Vasconcelos et al () reported an increase in artefact generation when evaluating the use of the MAR tool in filled canals. On the other hand, in studies using metallic materials such as implants (zirconia and titanium; Vasconcelos et al , Freitas et al ) and for evaluation of proximal caries in the presence of some materials with a high atomic number (Cebe et al ), the MAR tool was effective. Thus, it can be inferred that the MAR tool has a greater potential to correct artefacts generated by materials with a high atomic number, as suggested by Queiroz et al () when evaluating the impact of the use of the MAR tool in the presence of various dental materials, amongst them metallic alloys and gutta‐percha.…”

Section: Discussionmentioning

confidence: 99%

“…According to the American Association of Endodontists (AAE), the American Academy of Oral and Maxillofacial Radiology (AAOMR) and the European Society of Endodontology (ESE), CBCT is only recommended in those cases in which lower dose two‐dimensional radiography does not provide sufficient information for confident diagnosis (AAE & AAOMR Joint Position Statement , ESE ). However, when the region of interest contains metallic objects (restorations, implants, endodontic instruments) or root canal fillings, the high atomic number and density of these materials lead to the generation of artefacts, which are structures seen in the reconstructed image, but which are not present in the real object (Vasconcelos et al , Freitas et al ). These artefacts compromise the diagnostic accuracy of CBCT, since they can lead to formation of white striae and dark areas around anatomical structures of interest, hindering or even rendering the diagnosis impossible (Bechara et al , Queiroz et al , Freitas et al , Koç et al ).…”

Section: Introductionmentioning

confidence: 99%

Use of the metal artefact reduction tool in the identification of fractured endodontic instruments in cone‐beam computed tomography

et al. 2019

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Aim To evaluate the influence of the metal artefact reduction (MAR) tool in the diagnosis of fractured instruments in root canals of extracted mandibular molars, with or without root canal fillings. Methodology The root canals of 31 mandibular molars were divided into four groups: (i) the control group, without root fillings; (ii) the fracture group, without fillings and with fractured files; (iii) the fill group, with root filling; and (iv) the fill/fracture group, root filled and with fractured files. The following instruments were used as fractured endodontic instruments: stainless steel hand files, NiTi reciprocating files and NiTi rotary files. Each tooth was inserted in a dry mandible to obtain cone‐beam computed tomography (CBCT) images using a CBCT OP300 3D Maxio (Instrumentarium Dental, Tuusula, Finland) and Picasso Trio (Vatech, Hwaseong, Republic of Korea), with and without application of the MAR tool. All images were evaluated by three radiologists for the presence or absence of fractured files on a 5‐point scale. The diagnostic accuracy (area under ROC curve) was calculated. Image noise was measured in regions of trabecular and cortical bone and soft tissue. The comparison between the ROC curve values with the MAR tool enabled or disabled was performed using a t‐test. A t‐test was also employed for comparing image noise when the MAR tool was enabled and disabled. The significance level was set at 5%. Results The use of the MAR tool did not influence the diagnostic accuracy for identifying fractured endodontic instruments in root canals with and without fillings in both CBCT systems (P > 0.05), nor did it influence the image noise (P > 0.05). Conclusions The MAR tool on these two devices did not increase the detection of fractured endodontic instruments and did not reduce image noise using extracted mandibular molars. Therefore, the MAR tool is not recommended for evaluation of fractured endodontic instruments in teeth with and without root fillings in mandibular molars.

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CBCT Use in Daily Practice

Scarfe

Angelopoulos

2017

Maxillofacial Cone Beam Computed Tomography

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Evaluation of artifacts generated by zirconium implants in cone-beam computed tomography images

Cited by 53 publications

References 26 publications

The Effects of Promax Artefact Reduction Algorithm on Artefacts Induced by Titanium and Zirconium Implants

The Effects of Promax Artefact Reduction Algorithm on Artefacts Induced by Titanium and Zirconium Implants

Use of the metal artefact reduction tool in the identification of fractured endodontic instruments in cone‐beam computed tomography

CBCT Use in Daily Practice

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