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RISS 인기검색어
- 검색키워드
- 저자 : Patel Akash (검색결과 4 건)
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Mayank Patel,Akash Aggarwal,Arvind Kumar 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.8
The processing of high-strength Al7075 alloy through the laser powder bed fusion process is challenging because of crackingsusceptibility. In this work, an experimental study has been carried out to understand the defects formation and to predict theoptimum conditions for defect-free parts by varying process parameters such as laser power, scanning speed, base-plate heatingtemperature, remelting speed, and powder composition. A detailed mechanical and microstructural characterization hasbeen carried out to investigate porosities, cracks, microstructure, grain structure, and mechanical properties. It was observedthat the single-melting-based fabrication of Al7075 samples results in excessive porosities and solidification cracks alongthe build direction. The cracks are due to the insufficient liquid back-filling of the long columnar-dendritic grains during thesolidification. The ramped-down high-speed remelting eliminates the balling defect, decreases the porosity percentage, andreduces surface roughness. The base plate heating of 473 K and 573 K reduces the extent of porosity and crack formation. Adding 4 wt% nano-TiC reinforcement to the Al7075 matrix eliminates the porosity and solidification cracks due to the veryfine equiaxed grain because of heterogeneous nucleation.
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MacDonald David,Patel Akash,Zou Bingshuang,Yen Edwin,Vora Siddharth R. 대한영상치의학회 2022 Imaging Science in Dentistry Vol.52 No.3
Purpose: Lateral cephalograms of orthodontic patients may contain incidental findings that could potentially lead to harm. Materials and Methods: The lateral cephalograms of 1765 consecutive 12- to 20-year-old patients, being considered for routine orthodontic treatment, were retrospectively reviewed. These patients were considered normal, because no abnormalities were found either in their medical history or on their clinical examination. Results: The overall prevalence of incidental findings was 18.8%, of which 10.3% were ponticulus posticus and 4.2% were bridging of the sella turcica. Although occipital spurs and ponticulus posticus were more prevalent in males, the size of the sella turcicas did not differ between sexes. Of the 1156 patients completing treatment about 2 years later, only one lateral cephalogram displayed progression of the ponticulus posticus in that time. Conclusion: The prevalence of incidental findings on lateral cephalograms of otherwise normal orthodontic 12- to 20-year-old patients was almost a fifth, of which ponticulus posticus, vertebral fusion, and enlarged parietal foramina were clinically significant.
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MacDonald, David,Patel, Akash,Zou, Bingshuang,Yen, Edwin,Vora, Siddharth R. Korean Academy of Oral and Maxillofacial Radiology 2022 Imaging Science in Dentistry Vol.52 No.-
Purpose: Lateral cephalograms of orthodontic patients may contain incidental findings that could potentially lead to harm. Materials and Methods: The lateral cephalograms of 1765 consecutive 12- to 20-year-old patients, being considered for routine orthodontic treatment, were retrospectively reviewed. These patients were considered normal, because no abnormalities were found either in their medical history or on their clinical examination. Results: The overall prevalence of incidental findings was 18.8%, of which 10.3% were ponticulus posticus and 4.2% were bridging of the sella turcica. Although occipital spurs and ponticulus posticus were more prevalent in males, the size of the sella turcicas did not differ between sexes. Of the 1156 patients completing treatment about 2 years later, only one lateral cephalogram displayed progression of the ponticulus posticus in that time. Conclusion: The prevalence of incidental findings on lateral cephalograms of otherwise normal orthodontic 12- to 20-year-old patients was almost a fifth, of which ponticulus posticus, vertebral fusion, and enlarged parietal foramina were clinically significant.
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Spinal Epidermoid Tumors: Case Report and Review of the Literature
Vivek B. Beechar,Pascal O. Zinn,Kent A. Heck,Gregory N. Fuller,한인보,Akash J. Patel,Alexander E. Ropper 대한척추신경외과학회 2018 Neurospine Vol.15 No.2
Spinal epidermoid tumors are rare, benign tumors that are either acquired from trauma, surgery, or lumbar puncture or arise as congenital lesions, particularly spinal dysraphisms. We report a case of a massive spinal epidermoid tumor and review the literature with a focus on the surgical outcomes. A 71-year-old female patient presented after a fall with subsequent symptoms of severe back and hip pain, as well as loss of motor strength in the left leg. Her magnetic resonance imaging demonstrated a T2/short tau inversion recovery hyperintense mass extending from the level of the T10–11 disc caudally through S2. A biopsy was recommended to determine whether the tumor was radio- or chemo-sensitive. The patient underwent a L4 laminectomy and a pearly-white tumor was encountered, with a subsequent biopsy confirming it to be an epidermoid tumor. The following conclusions can be drawn from a review of the literature. Spinal epidermoid tumors are more common in women and tend to present in younger patients (median age of 23). The majority of patients had acquired lesions (46%). In terms of surgical outcomes for adherent tumors, gross total resection was found to provide optimal outcomes, with 90% of patients improving clinically after surgery.
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