对传统扭转式矫治器和各种 CAD/CAM 固定矫治器在核磁共振成像中造成的伪影进行活体评估。

IF 1.3 4区 医学 Q3 DENTISTRY, ORAL SURGERY & MEDICINE
Christoph J Roser, Tim Hilgenfeld, Muhammad Abdullah Saleem, Thomas Rückschloß, Sabine Heiland, Martin Bendszus, Christopher J Lux, Alexander Juerchott
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引用次数: 0

摘要

目的:评估不同计算机辅助设计/计算机辅助制造(CAD/CAM)保持器与传统手工弯曲不锈钢扭转式保持器在体内造成的磁共振成像(MRI)伪影:对插入不同 CAD/CAM 保持器(钴铬合金;镍钛合金;5 级钛合金;Ti5)和扭转式保持器的男性志愿者进行磁共振成像扫描(3 特斯拉)。两位盲放射科医生采用既定的五点可见度评分法(1:极佳;2:良好;3:中等;4:较差;5:不可见)对保持器区域(RA;从犬齿到犬齿)内外的总共 126 个地标进行了评估。统计分析采用弗里德曼检验和双尾 Wilcoxon 检验(显著性水平:p):Twistflex 保持器对 RA 内(4.0 ± 1.5)和 RA 外(1.7 ± 1.2)所有地标的可见度影响最大。相比之下,CAD/CAM 保持器造成的假象仅限于 RA 内的牙齿区域(CoCr:2.2 ± 1.2),或者不会对基于 MRI 的临床诊断造成影响(NiTi:1.0 ± 0.1;Ti5:1.4 ± 0.6):本研究对单个测试者的研究表明,传统的不锈钢扭转屈曲保持器会严重影响头颈部和牙科磁共振成像的诊断价值。相比之下,钴铬合金 CAD/CAM 保持器可能会造成伪影,对牙齿核磁共振成像只有轻微影响,但对头/颈部核磁共振成像没有影响,而镍钛和 Ti5 CAD/CAM 保持器可能与头/颈部和牙齿核磁共振成像完全兼容。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

In vivo assessment of artefacts in MRI images caused by conventional twistflex and various fixed orthodontic CAD/CAM retainers.

In vivo assessment of artefacts in MRI images caused by conventional twistflex and various fixed orthodontic CAD/CAM retainers.

Purpose: To assess magnetic resonance imaging (MRI) artefacts caused by different computer-aided design/computer-aided manufacturing (CAD/CAM) retainers in comparison with conventional hand bent stainless steel twistflex retainers in vivo.

Materials and methods: MRI scans (3 Tesla) were performed on a male volunteer with different CAD/CAM retainers (cobalt-chromium, CoCr; nickel-titanium, NiTi; grade 5 titanium, Ti5) and twistflex retainers inserted. A total of 126 landmarks inside and outside the retainer area (RA; from canine to canine) were evaluated by two blinded radiologists using an established five-point visibility scoring (1: excellent, 2: good, 3: moderate, 4: poor, 5: not visible). Friedman and two-tailed Wilcoxon tests were used for statistical analysis (significance level: p < 0.05).

Results: Twistflex retainers had the strongest impact on the visibility of all landmarks inside (4.0 ± 1.5) and outside the RA (1.7 ± 1.2). In contrast, artefacts caused by CAD/CAM retainers were limited to the dental area inside the RA (CoCr: 2.2 ± 1.2) or did not impair MRI-based diagnostics in a clinically relevant way (NiTi: 1.0 ± 0.1; Ti5: 1.4 ± 0.6).

Conclusion: The present study on a single test person demonstrates that conventional stainless steel twistflex retainers can severely impair the diagnostic value in head/neck and dental MRI. By contrast, CoCr CAD/CAM retainers can cause artefacts which only slightly impair dental MRI but not head/neck MRI, whereas NiTi and Ti5 CAD/CAM might be fully compatible with both head/neck and dental MRI.

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来源期刊
CiteScore
3.90
自引率
0.00%
发文量
64
审稿时长
>12 weeks
期刊介绍: The Journal of Orofacial Orthopedics provides orthodontists and dentists who are also actively interested in orthodontics, whether in university clinics or private practice, with highly authoritative and up-to-date information based on experimental and clinical research. The journal is one of the leading publications for the promulgation of the results of original work both in the areas of scientific and clinical orthodontics and related areas. All articles undergo peer review before publication. The German Society of Orthodontics (DGKFO) also publishes in the journal important communications, statements and announcements.
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