Clin Oral Investig:高分辨率MR影像对于牙印模的应用分析:一项可行性研究

2017-09-22 lishiting MedSci原创

磁共振成像影像分析在牙科医疗中是一种新兴科技。特别是当低分辨率MRI已经为检查颞下颌关节(由于其解剖部位数据难以获取)提供了可行的办法,这篇研究的目的是为了评估高分辨率MRI是否可以产生足够精确的数据集作为人牙齿的数字印模。

磁共振成像影像分析在牙科医疗中是一种新兴科技。特别是当低分辨率MRI已经为检查颞下颌关节(由于其解剖部位数据难以获取)提供了可行的办法,这篇研究的目的是为了评估高分辨率MRI是否可以产生足够精确的数据集作为人牙齿的数字印模。

研究选择了一名需要部分固定义齿修复患牙的患者作为受试对象,并告知患者和获得同意。使用MRI扫描分析2颗预备的牙齿,并在进行傅里叶变换前进行数据集的精确加工。重组后所产生的3D文件送入现有的工业标准CAD/CAM流程中。

结果显示,扫描后形成了数字模拟的固定义齿结构,并通过激光烧结而成。按照目前的临床标准,此义齿口内试戴合适,可使固定义齿持久固位。

结论:与普通牙科印模材料固化时间相比较,使用临床全身MR扫描外加自定义附加硬件、增强对比度和数据后处理,可使分辨率和信噪比在采集时间内都足够达到制作牙修复体的要求。此外,患者对检测方法可以很好耐受。

临床意义:此处描述的方法可以被视为对此项理论的验证:当需要部分固定义齿修复时,MRI有希望成为数字印模的一种新选择。

原始出处:

Boldt J, Rottner K, et al. High-resolution MR imaging for dental impressions: a feasibility study. Clin Oral Investig. 2017 Sep 19. doi: 10.1007/s00784-017-2204-1.

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    2018-01-26 小几洁
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    2018-02-19 lsndxfj
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氙是一种化学元素,它的元素符号是Xe,它的原子序数是54,是一种无色无味的稀有气体,放电时呈蓝色。在地球大气层中存在痕量的氙。除了个别化合物外,氙化合物都是无色的。已知的氙的稳定同位素有9种(参见氙的同位素)。它还有40种不稳定的放射性同位素。氙的放射性同位素是研究太阳系早期历史的重要工具。氙-135是核裂变的产物之一,并用作核反应堆的中子吸收剂。氙可以用于制造氙光灯和氙弧灯,也是一种全身麻醉剂。

JCO:MRI和PET-CT基线水平在多发性骨髓瘤中的意义

多发性骨髓瘤(MM)是血液系统第二大肿瘤,约占血液肿瘤的10%~15%。MM的典型表现为溶骨性骨质破坏,常规X线检查长期以来做为多发骨髓瘤的标准方法,但有10-20%的患者常规X线检查为阴性。

Neuroradiology:3D T2WI 在诊断脊髓硬脊膜动静脉瘘的诊断价值

硬脊膜动静脉瘘(SDAVF)是近20年来才逐渐被人们认识的一种椎管内血管畸形。本研究旨在评价脊髓MRI在有无联合3D T2WI在评价脊髓数字剪影血管造影(DSA)确诊的脊髓SDAVF的价值,并将结果发表在Neuroradiology上。