Evaluation of a Continuous-Rotation, High-Speed Scanning Protocol for Micro-Computed Tomography

2011 ◽  
Vol 35 (4) ◽  
pp. 517-523 ◽  
Author(s):  
Hans Ulrich Kerl ◽  
Cristina T. Isaza ◽  
Hanne Boll ◽  
Sebastian J. Schambach ◽  
Ingo S. Nolte ◽  
...  
Keyword(s):  
Computed Tomography ◽  
High Speed ◽  
Micro Computed Tomography ◽  
Scanning Protocol ◽  
Continuous Rotation

scholarly journals Influence of Drilling Technique on the Radiographic, Thermographic, and Geomorphometric Effects of Dental Implant Drills and Osteotomy Site Preparations

2020 ◽  
Vol 9 (11) ◽  
pp. 3631
Author(s):  
Lara Fraguas de San José ◽  
Filippo Maria Ruggeri ◽  
Roberta Rucco ◽  
Álvaro Zubizarreta-Macho ◽  
Jorge Alonso Pérez-Barquero ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Dental Implant ◽  
High Speed ◽  
Digital Camera ◽  
Study Groups ◽  
Site Preparation ◽  
Osteotomy Site ◽  
Study Group ◽  
Micro Computed Tomography ◽  
Drilling Technique

The aim of this comparative study is to analyze the influence of drilling technique on the radiographic, thermographic, and geomorphometric effects of dental implant drills and osteotomy site preparations. One hundred and twenty osteotomy site preparations were performed on sixty epoxy resin samples using three unused dental implant drill systems and four drilling techniques performed with a random distribution into the following study groups: Group A: drilling technique performed at 800 rpm with irrigation (n = 30); Group B: drilling technique performed at 45 rpm without irrigation (n = 30); Group C: drilling technique performed at 45 rpm with irrigation (n = 30); and Group D: drilling technique performed at 800 rpm without irrigation (n = 30). The osteotomy site preparation morphologies performed by the 4.1 mm diameter dental implant drills from each study group were analyzed and compared using a cone beam computed tomography (CBCT) scan. The termographic effects generated by the 4.1 mm diameter dental implant drills from each study group were registered using a termographic digital camera and the unused and 4.1 mm diameter dental implant drills that were used 30 times from each study group were exposed to a micro computed tomography (micro-CT) analysis to obtain a Standard Tessellation Language (STL) digital files that determined the wear comparison by geomorphometry. Statistically significant differences were observed between the thermographic and radiographic results of the study groups (p < 0.001). The effect of cooling significatively reduced the heat generation during osteotomy site preparation during high-speed drilling; furthermore, osteotomy site preparation was not affected by the wear of the dental implant drills after 30 uses, regardless of the drilling technique.

Shaping ability of two nickel–titanium instruments activated by continuous rotation or adaptive motion: a micro-computed tomography study

2016 ◽  
Vol 20 (8) ◽  
pp. 2227-2233 ◽  
Author(s):  
E. Pedullà ◽  
G. Plotino ◽  
N. M. Grande ◽  
G. Avarotti ◽  
G. Gambarini ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Nickel Titanium ◽  
Micro Computed Tomography ◽  
Continuous Rotation ◽  
Adaptive Motion ◽  
Shaping Ability

scholarly journals Application of X-ray micro-computed tomography on high-speed cavitating diesel fuel flows

2016 ◽  
Vol 57 (11) ◽  
Author(s):  
N. Mitroglou ◽  
M. Lorenzi ◽  
M. Santini ◽  
M. Gavaises
Keyword(s):  
Computed Tomography ◽  
Diesel Fuel ◽  
High Speed ◽  
Micro Computed Tomography ◽  
X Ray

scholarly journals Not so fast: strike kinematics of the araneoid trap-jaw spider Pararchaea alba (Malkaridae: Pararchaeinae)

2021 ◽  
Author(s):  
Robert J Kallal ◽  
Damian O Elias ◽  
Hannah M Wood
Keyword(s):  
Computed Tomography ◽  
Elastic Energy ◽  
Power Output ◽  
Muscle Function ◽  
High Speed ◽  
Micro Computed Tomography ◽  
Similar Morphology ◽  
Stored Elastic Energy

Abstract To capture prey otherwise unattainable by muscle function alone, some animal lineages have evolved movements that are driven by stored elastic energy, producing movements of remarkable speed and force. One such example that has evolved multiple times is a trap-jaw mechanism, in which the mouthparts of an animal are loaded with energy as they open to a wide gape and then, when triggered to close, produce a terrific force. Within the spiders (Araneae), this type of attack has thus far solely been documented in the palpimanoid family Mecysmaucheniidae but a similar morphology has also been observed in the distantly related araneoid subfamily Pararchaeinae, leading to speculation of a trap-jaw attack in that lineage as well. Here, using high-speed videography, we test whether cheliceral strike power output suggests elastic-driven movements in the pararchaeine Pararchaea alba. The strike speed attained place P. alba as a moderately fast strikers exceeding the slowest mecysmaucheniids, but failing to the reach the most extreme high-speed strikers that have elastic-driven mechanisms. Using micro-Computed-Tomography, we compare the morphology of P. alba chelicerae in the resting and open positions, and their related musculature, and based on results propose a mechanism for cheliceral strike function that includes a torque reversal latching mechanism. Similar to the distantly related trap-jaw mecysmaucheniid spiders, the unusual prosoma morphology in P. alba seemingly allows for highly maneuverable chelicerae with a much wider gape than typical spiders, suggestive that increasingly maneuverable joints coupled with a latching mechanism may serve as a precursor to elastic-driven movements.

Understanding the efficacy of micro-CT to analyse high speed sintering parts

2016 ◽  
Vol 22 (1) ◽  
pp. 152-161 ◽  
Author(s):  
Davood Rouholamin ◽  
Neil Hopkinson
Keyword(s):  
Computed Tomography ◽  
High Speed ◽  
3D Structure ◽  
Morphological Properties ◽  
Micro Computed Tomography ◽  
Elongation At Break ◽  
Content Type ◽  
Nylon 12 ◽  
Non Destructive ◽  
Suitable Technique

Purpose – The purpose of this study was to assess the suitability of micro-computed tomography as a non-destructive method to investigate the morphology of nylon 12 parts produced by high-speed sintering (HSS). The investigation of the effect of changes in the lamp power on the properties of the fabricated parts was another purpose of this study. Design/methodology/approach – Nylon 12 parts were manufactured using HSS with various lamp powers. Morphological properties of the parts were measured using micro-computed tomography. Ultimate tensile strength, elongation at break and Young’s modulus of the prepared parts were determined and compared. The effect of lamp power on the properties of the parts was then studied. Findings – This paper proposes micro-computed tomography as a suitable technique to study the 3D structure of the parts produced by HSS. The effects of lamp power on the properties of the produced parts were also discussed. Practical implications – The findings could result in an improvement in customisation of the parts for various applications through varying the lamp power. The level of lamp power could be tailored to obtain suitable part properties for a target application. Originality/value – This study strengthens the fact that HSS is a promising additive manufacturing technique to produce nylon 12 parts, and the properties of the parts could be maximised using a suitable level of lamp power. The results showed that micro-computed tomography could be used as an efficient technique to investigate the morphology of the sintered parts.

Cortical and trabecular bone parameters from HR-Pqct images at the Tibia: a local comparison with synchrotron radiation micro-computed tomography

2013 ◽  
Author(s):  
Agnes Ostertag ◽  
Francoise Peyrin ◽  
Sylvie Fernandez ◽  
Jean-Denis Laredo ◽  
Vernejoul Marie-Christine De ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Synchrotron Radiation ◽  
Trabecular Bone ◽  
Micro Computed Tomography ◽  
Bone Parameters ◽  
Local Comparison
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