Geometric Analysis of the Distolingual Root and Canal in Mandibular First Molars: A Micro–computed Tomographic Study

2021 ◽  
Vol 47 (5) ◽  
pp. 779-786
Author(s):  
Weiwei Wu ◽  
Qiang Guo ◽  
Boon Kit Tan ◽  
Dingming Huang ◽  
Xuedong Zhou ◽  
...  
Keyword(s):  
Geometric Analysis ◽  
Computed Tomographic ◽  
Distolingual Root

scholarly journals Biometric analysis of apical surgery-related anatomy of mandibular first molars: a cone-beam computed tomography study in a Mongoloid population

2019 ◽  
Vol 48 (4) ◽  
pp. 030006051989239
Author(s):  
Xue Wang ◽  
Yuejiao Zhang ◽  
Xiaolan Li ◽  
Zijing Huang ◽  
Minyi Cui ◽  
...  
Keyword(s):  
Root Apex ◽  
Cone Beam ◽  
Biometric Analysis ◽  
Tomographic Images ◽  
Computed Tomographic ◽  
Apical Surgery ◽  
Surgical Access ◽  
Distolingual Root ◽  
Long Access ◽  
Mongoloid Population

Objective To evaluate the apical surgery-related anatomy of two-rooted and three-rooted mandibular first molars (MFMs) in a Mongoloid population. Methods A total of 502 cone-beam computed tomographic images were used to evaluate the root configuration, the distance from the buccal bone to each root, root dimensions, and the complete root resection distance at the resection level for roots of MFMs. Results The prevalence of two-rooted and three-rooted MFMs was 85.1% and 14.9%, respectively. At the resection level, the distance from the buccal bone to the mesial and distal roots of two-rooted MFMs was 2.24 and 3.15 mm, respectively, while the distance was 2.44, 2.01, and 8.55 mm for the mesial, distobuccal, and distolingual roots of three-rooted MFMs, respectively. The distance from the buccal bone to each root was longer in men than in women. The largest distance for complete root resection was detected for the distal root in two-rooted MFMs and for the distolingual root in three-rooted MFMs. Conclusions The prevalence of three-rooted MFMs is common in the Mongoloid population. The distance from the buccal bone to root apex differs according to root configurations and sex. Surgical access to the distolingual root is difficult because of the long access distance.

Liquid crystalline ordering of paired helical filaments in neurofibrillary tangles of Alzheimer's disease

1986 ◽  
Vol 44 ◽  
pp. 348-349
Author(s):  
D.F. Clapin ◽  
V.J.A. Montpetit
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Neurofibrillary Tangles ◽  
Liquid Crystalline ◽  
Amyloid Fibrils ◽  
Geometric Analysis ◽  
Paired Helical Filaments ◽  
Microscopic Level ◽  
Light Microscopic Level ◽  
Regular Spacing

Alzheimer's disease is characterized by the accumulation of abnormal filamentous proteins. The most important of these are amyloid fibrils and paired helical filaments (PHF). PHF are located intraneuronally forming bundles called neurofibrillary tangles. The designation of these structures as "tangles" is appropriate at the light microscopic level. However, localized domains within individual tangles appear to demonstrate a regular spacing which may indicate a liquid crystalline phase. The purpose of this paper is to present a statistical geometric analysis of PHF packing.

Lumbar lateral canal entrapment: Clinical, radiculographic and computed tomographic findings

1988 ◽  
Vol 39 (1) ◽  
pp. 144-149 ◽  
Author(s):  
I STOCKLEY ◽  
C GETTY ◽  
A DIXON ◽  
I GLAVES ◽  
H EUINTON ◽  
...  
Keyword(s):  
Computed Tomographic ◽  
Lateral Canal

Diagnostic workup and endovascular treatment of popliteal artery trauma

VASA ◽  
2019 ◽  
Vol 48 (1) ◽  
pp. 65-71 ◽  
Author(s):  
Cheong J. Lee ◽  
Rory Loo ◽  
Max V. Wohlauer ◽  
Parag J. Patel
Keyword(s):  
Vascular Injury ◽  
Gold Standard ◽  
Imaging Techniques ◽  
Computed Tomographic Angiography ◽  
Vascular Trauma ◽  
Endovascular Techniques ◽  
Computed Tomographic ◽  
Arterial Injuries ◽  
Arterial Trauma ◽  
Peripheral Arterial

Abstract. Although management paradigms for certain arterial trauma, such as aortic injuries, have moved towards an endovascular approach, the application of endovascular techniques for the treatment of peripheral arterial injuries continues to be debated. In the realm of peripheral vascular trauma, popliteal arterial injuries remain a devastating condition with significant rates of limb loss. Expedient management is essential and surgical revascularization has been the gold standard. Initial clinical assessment of vascular injury is aided by readily available imaging techniques such as duplex ultrasonography and high resolution computed tomographic angiography. Conventional catheter based angiography, however, remain the gold standard in the determination of vascular injury. There are limited data examining the outcomes of endovascular techniques to address popliteal arterial injuries. In this review, we examine the imaging modalities and current approaches and data regarding endovascular techniques for the management popliteal arterial trauma.

Analysis of air contrast barium enema, computed tomographic colonography, and colonoscopy: prospective comparison

The Lancet ◽  
2005 ◽  
Vol 365 (9456) ◽  
pp. 305-311 ◽  
Author(s):  
D ROCKEY ◽  
E PAULSON ◽  
D NIEDZWIECKI ◽  
W DAVIS ◽  
H BOSWORTH ◽  
...  
Keyword(s):  
Barium Enema ◽  
Computed Tomographic Colonography ◽  
Computed Tomographic ◽  
Prospective Comparison
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