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Comparison between microporous and nanoporous orthodontic miniscrews : An experimental study in rabbits. 微孔和纳米多孔正畸微型螺钉的比较：兔子实验研究。
IF 1.7
The Journal of the Arkansas Medical Society
Pub Date : 2024-01-01 Epub Date: 2022-05-20 DOI: 10.1007/s00056-022-00398-3
Yueh-Tse Lee, Eric Jein-Wein Liou, Sinn-Wen Chen

Purpose: Surface characteristics of orthodontic miniscrews might affect survival rates and removal torque values (RTVs). This experimental study aimed to clarify whether and why a microporous or nanoporous surface promotes higher survival rates and RTVs for orthodontic miniscrews.

Methods: Using a split-leg design, one set each of nonporous (sham control, n = 24) and microporous (control, n = 6), and three sets of nanoporous (experimental, n = 6 per set) miniscrews were implanted in the tibias of 12 New Zealand rabbits and immediately loaded with 1.5 N nickel-titanium coil springs for 12 weeks. The surface morphology, micropores, and nanotube diameters of the miniscrews were examined using scanning electron microscopy and field-emission scanning electron microscopy. The surface composition and thickness were determined using Auger electron spectroscopy. The survival rates and RTVs of each set were assessed.

Results: The nanoporous miniscrews had higher survival rates, RTVs (p < 0.001), and thicker nanotube oxide thicknesses (p < 0.001) than the nonporous and microporous miniscrews. The nonporous and microporous miniscrews had no nanotube structures. The surface oxide composition was titanium dioxide (TiO2). The threshold RTV, TiO2 thickness, and nanotube diameter of nanoporous miniscrews needed to promote the experimental survival rate to 100% was determined to be 6.6 ± 0.8 N-cm (p < 0.05), 22.5 ± 4.8 nm (p < 0.05), and 17.6 ± 2.3 nm or above, respectively.

Conclusion: Nanoporous surfaces promoted higher survival rates and RTVs than microporous miniscrews. This could be due to TiO2 nanotube structures with thicker oxide layers in nanoporous miniscrews.

目的：正畸微型螺钉的表面特性可能会影响存活率和去除力矩值（RTV）。本实验研究旨在阐明微孔或纳米多孔表面是否会提高正畸微型螺丝的存活率和去除力矩值，以及为什么会提高存活率和去除力矩值：采用分腿设计，将无孔（假对照组，n = 24）、微孔（对照组，n = 6）和三组纳米多孔（实验组，每组 n = 6）微型螺钉分别植入 12 只新西兰兔的胫骨，并立即用 1.5 N 镍钛螺旋弹簧加载 12 周。使用扫描电子显微镜和场发射扫描电子显微镜检查了微型螺钉的表面形态、微孔和纳米管直径。使用奥杰电子能谱测定了表面成分和厚度。评估了每组的存活率和 RTV：结果：纳米多孔微型螺钉的存活率和 RTV（p 2）较高。将纳米多孔微型螺钉的实验存活率提高到 100%所需的阈值 RTV、TiO2 厚度和纳米管直径被确定为 6.6 ± 0.8 N-cm（p 结论：纳米多孔表面可提高存活率：纳米多孔表面比微孔微型螺钉具有更高的存活率和 RTV。这可能是由于纳米多孔微型螺杆中的 TiO2 纳米管结构具有更厚的氧化层。
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引用次数: 0
Demonstration of a simple do-it-yourself test of mask barrier function using widely available commercial products. 演示一个简单的自己做测试的口罩屏障功能，使用广泛可用的商业产品。
The Journal of the Arkansas Medical Society
Pub Date : 2021-06-01
Marissa K Johnston, Mitchell R McGill

By December 2020, SARS-CoV-2 caused the deaths of nearly 1.5 million people worldwide. A common strategy to mitigate spread of the virus is mask wearing. Considerable data demonstrate that masks can create an effective barrier to the respiratory droplets that can carry the virus. However, the effectiveness of consumer masks for this purpose varies, and there are currently no minimum standards that mask manufacturers must meet. Therefore, a need exists for an at-home test of mask barrier function. Here, we demonstrate a simple test to compare the function of selected masks using widely available materials and resources.

截至2020年12月，SARS-CoV-2在全球造成近150万人死亡。减轻病毒传播的一个常见策略是戴口罩。大量数据表明，口罩可以对携带病毒的呼吸道飞沫形成有效屏障。然而，用于这一目的的消费者口罩的有效性各不相同，目前没有口罩制造商必须达到的最低标准。因此，有必要在家中测试口罩的防护功能。在这里，我们演示了一个简单的测试，以比较使用广泛可用的材料和资源的选定口罩的功能。
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引用次数: 0
Mountain Sickness 高山病
The Journal of the Arkansas Medical Society
Pub Date : 2021-01-01 DOI: 10.1542/ppe_schmitt_297
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引用次数: 0
Characteristics of E-Cigarette, or Vaping, Product Use-Associated Lung Injury (EVALI) Patients. 电子烟或电子烟产品使用相关肺损伤(EVALI)患者的特征
The Journal of the Arkansas Medical Society
Pub Date : 2020-11-01
Allison E James, Brandy Sutphin, Patrick Fleming, Donald McCormick, Appathurai Balamurugan

During August-December 2019, 23 persons who received a diagnosis of e-cigarette, or vaping, product use-associated lung injury (EVALI) were reported to the Arkansas Department of Health (ADH); none died. Among Arkansas EVALI patients, most were aged <25 years and white; two-thirds were male. Approximately half of Arkansas EVALI patients were admitted to intensive care units. Among 18 patients who were interviewed, 61% reported using both nicotine and tetrahydrocannabinol in an e-cigarette, or vaping, device during the 90 days preceding illness onset. Clinicians should remain vigilant for EVALI and continue to report cases to ADH.

2019年8月至12月期间，向阿肯色州卫生部(ADH)报告了23名被诊断为电子烟或电子烟产品使用相关肺损伤(EVALI)的人;没有死亡。在阿肯色州的EVALI患者中，大多数是老年人
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引用次数: 0
Walking. 散步。
The Journal of the Arkansas Medical Society
Pub Date : 2020-02-07 DOI: 10.32388/7owx6w
H. A. Grimes
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引用次数: 0
Atrial Myxoma 心房粘液瘤
The Journal of the Arkansas Medical Society
Pub Date : 2020-02-07 DOI: 10.32388/5u98rw
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引用次数: 0
Myocardial infarction. 心肌梗死。
The Journal of the Arkansas Medical Society
Pub Date : 2020-02-07 DOI: 10.32388/oyot3h
A. Kahn
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引用次数: 0
AIDS related lymphoma. 艾滋病相关淋巴瘤。
The Journal of the Arkansas Medical Society
Pub Date : 2020-02-07 DOI: 10.32388/7hulpg
J. Beck
An aggressive lymphoma that develops in HIV-positive patients. There is a significant increase in the incidence of lymphomas associated with the AIDS epidemic. These lymphomas are usually extranodal, most often express a B-cell phenotype and morphologically are classified as Burkitt, diffuse large B-cell, and Hodgkin lymphomas. The prognosis is closely related to the severity of immunodeficiency.
一种发生在hiv阳性患者身上的侵袭性淋巴瘤。与艾滋病流行有关的淋巴瘤发病率显著增加。这些淋巴瘤通常在结外，最常表现为b细胞表型，形态学上分为伯基特淋巴瘤、弥漫性大b细胞淋巴瘤和霍奇金淋巴瘤。预后与免疫缺陷的严重程度密切相关。
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引用次数: 0
Plastic surgery. 整形手术。
The Journal of the Arkansas Medical Society
Pub Date : 2019-05-20 DOI: 10.1201/9780429091513-7
J. Stuckey
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引用次数: 0
Lead poisoning. 铅中毒。
The Journal of the Arkansas Medical Society
Pub Date : 2019-04-01 DOI: 10.1891/9780826179357.0229
I. L. Millard
{"title":"Lead poisoning.","authors":"I. L. Millard","doi":"10.1891/9780826179357.0229","DOIUrl":"https://doi.org/10.1891/9780826179357.0229","url":null,"abstract":"","PeriodicalId":75122,"journal":{"name":"The Journal of the Arkansas Medical Society","volume":"82 6 1","pages":"263-4"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49612403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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