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Root canal therapy combined with endoscopic sinus surgery for odontogenic sinusitis:Efficacy comparison in a cohort study
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作者 Jun-Wen Xiao Ping Yu Zhang Zhao 《World Journal of Clinical Cases》 SCIE 2025年第5期13-21,共9页
BACKGROUND Odontogenic maxillary sinusitis,often triggered by dental issues like periapical periodontitis,significantly contributes to chronic sinusitis,mainly affecting adults around 50 years old,emphasizing the need... BACKGROUND Odontogenic maxillary sinusitis,often triggered by dental issues like periapical periodontitis,significantly contributes to chronic sinusitis,mainly affecting adults around 50 years old,emphasizing the need for a multidisciplinary diagnostic and treatment approach.AIM To investigate the therapeutic effect and clinical value of root canal therapy combined with nasal endoscopic surgery compared with simple root canal the-rapy in the treatment of severe odontogenic maxillary sinusitis caused by peria-pical periodontitis.METHODS The clinical data,diagnosis,and treatment of 200 patients with severe odonto-genic maxillary sinusitis caused by periapical periodontitis from October 2020 to October 2021 were analyzed retrospectively.Among them,63 patients were treated with simple root canal therapy as the control group,and 137 patients were treated with root canal therapy combined with nasal endoscopic surgery as the observation group.The therapeutic effect,Lund-Kennedy endoscopic score,paranasal sinus Lund-Mackay score,complication rate,recurrence rate,and patient satisfaction were compared between the two groups.RESULTS First,we compared the effective rates:23 cases were cured,22 were improved,and 8 were ineffective in the control group,yielding a total effective rate of 84.90%.Meanwhile,97 cases were cured,34 improved,and 6 were ineffective in the observation group,resulting in a total effective rate of 95.62%.The observation group had a higher total effective rate compared with the control group(P<0.05).Second,we compared the Lund–Kennedy endoscopic score.Before treatment,no significant difference(P>0.05)was observed in this score between the two groups.After treatment,the Lund–Kennedy endoscopic score decreased in both groups.The Lund–Kennedy endoscopic score of the observation group at 3 and 6 mo after treatment was lower compared to that of the control group(P<0.05).Third,we compared the Lund–Mackay score of paranasal sinuses.Before treatment,there was no significant difference in this score between the two groups(P>0.05).After treatment,the Lund–Mackay scores of paranasal sinuses decreased in both groups.The Lund–Mackay scores of paranasal sinuses in the observation group at 3 and 6 mo after treatment were lower compared to those of the control group(P<0.05).Fourth,we compared the incidence and recurrence rate of complications.Three months after treatment,no significant difference was found in the incidence and recurrence rate of complications between the observation group(6.56%)and the control group(9.52%)(P>0.05).However,6 mo after treatment,the incidence and recurrence rate of complications in the observation group(2.91%)was significantly higher compared to that of the control group(12.69%)(P<0.05).Fifth,we compared patient satisfaction.Six months after treatment,the patient satisfaction of the observation group(93.43%)was significantly better than that of the control group(84.12%)(P<0.05).CONCLUSION Root canal therapy combined with nasal endoscopic surgery has a good therapeutic effect on severe odontogenic maxillary sinusitis caused by periapical periodontitis,and it can reduce the injury of maxillary sinus mucosa and bone,and significantly reduce the incidence of complications and recurrence rate.Meanwhile,it has high patient satisfaction and remarkable therapeutic effect,which is suggested to be popularized and applied in clinic. 展开更多
关键词 Root canal therapy Nasal endoscopic surgery Periapical periodontitis Odontogenic maxillary sinusitis Therapeutic effect Clinical value
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Peat properties of a tropical forest reserve adjacent to a fire-break canal
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作者 Dayang Nur Sakinah Musa Mohd Zahirasri Mohd Tohir +3 位作者 Xinyan Huang Luqman Chuah Abdullah Mohamad Syazaruddin Md Said Muhammad Firdaus Sulaiman 《Journal of Forestry Research》 SCIE EI CAS CSCD 2024年第1期155-167,共13页
Tropical peat comprises decomposed dead plant material and acts like a sponge to absorb water,making it fully saturated.However,drought periods dry it readily and increases its vulnerability to fire.Peat fires emit gr... Tropical peat comprises decomposed dead plant material and acts like a sponge to absorb water,making it fully saturated.However,drought periods dry it readily and increases its vulnerability to fire.Peat fires emit greenhouse gases and particles contributing to haze,and prevention by constructing fire-break canals to reduce fire spread into forest reserves is crucial.This paper aims to determine peat physical and chemical properties near a fire-break canal at different fire frequency areas.Peat sampling was conducted at two forest reserves in Malaysia which represent low fire frequency and high fire frequency areas.The results show that peat properties were not affected by the construction of a fire-break canal,however lignin and cellulose content increased significantly from the distance of the canal in both areas.The study concluded that fire frequency did not significantly influence peat properties except for porosity.The higher fibre content in the high frequency area did not influence moisture content nor the ability to regain moisture.Thus,fire frequency might contribute differently to changes in physical and chemical properties,hence management efforts to construct fire-break canals and restoration efforts should protect peatlands from further degradation.These findings will benefit future management and planning for forest reserves. 展开更多
关键词 Peat fire Peat properties Fire-break canals Forest reserves
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Steel bar penetrating cervical spinal canal without neurological injury:A case report
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作者 Qin Zhang Tao Ding +1 位作者 Xiao-Feng Gu Yi Liu 《World Journal of Clinical Cases》 SCIE 2024年第17期3214-3220,共7页
BACKGROUND We report a rare case of cervical spinal canal penetrating trauma and review the relevant literatures.CASE SUMMARY A 58-year-old male patient was admitted to the emergency department with a steel bar penetr... BACKGROUND We report a rare case of cervical spinal canal penetrating trauma and review the relevant literatures.CASE SUMMARY A 58-year-old male patient was admitted to the emergency department with a steel bar penetrating the neck,without signs of neurological deficit.Computed tomography(CT)demonstrated that the steel bar had penetrated the cervical spinal canal at the C6–7 level,causing C6 and C7 vertebral body fracture,C6 left lamina fracture,left facet joint fracture,and penetration of the cervical spinal cord.The steel bar was successfully removed through an open surgical procedure by a multidisciplinary team.During the surgery,we found that the cervical vertebra,cervical spinal canal and cervical spinal cord were all severely injured.Postoperative CT demonstrated severe penetration of the cervical spinal canal but the patient returned to a fully functional level without any neurological deficits.CONCLUSION Even with a serious cervical spinal canal penetrating trauma,the patient could resume normal work and life after appropriate treatment. 展开更多
关键词 Cervical spinal canal Penetrating trauma Steel bar Neurological deficit Case report
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The Millennia-Old Canal Takes on a New Look Nihao!China——2024 China's Grand Canal Tourism Overseas Promotion Season
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作者 Li Peng 《China & The World Cultural Exchange》 2024年第8期10-15,共6页
On the occasion of the 10th anniversary of the Grand Canal's application for the World Heritage status in 2024,with the strong support of the Department of International Cooperation of the National Radio and Telev... On the occasion of the 10th anniversary of the Grand Canal's application for the World Heritage status in 2024,with the strong support of the Department of International Cooperation of the National Radio and Television Administration and the International Tourism Alliance of Silk Road Cities. 展开更多
关键词 GRAND ALLIANCE canal
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Surgical Management of Lumbar Spinal Canal Stenosis with Instrumentation at the Yaounde Central Hospital: Comparison of Unilateral versus Bilateral Pedicle Screw Fixation Combined with Transforaminal Lumbar Interbody Fusion
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作者 Orlane Toto Ndome Nassourou Oumarou Haman +4 位作者 Dimitri Fogue Jean Bruno Ndoumou Ronaldo Fonju Anu Indira Baboke Vincent De Paul Djientcheu 《Open Journal of Modern Neurosurgery》 2024年第3期179-189,共11页
Introduction: The choice of adopting unilateral pedicle screw fixation or using bilateral pedicle screw fixation in lumbar spinal stenosis remains controversial. In our context, very few studies have been performed co... Introduction: The choice of adopting unilateral pedicle screw fixation or using bilateral pedicle screw fixation in lumbar spinal stenosis remains controversial. In our context, very few studies have been performed comparing the clinical effectiveness of unilateral versus bilateral fixation in the surgical management of lumbar spinal canal stenosis. Objective: Evaluate the impact on quality of life and clinical efficacy of unilateral spondylodesis compared to bilateral spondylodesis in the surgical management of lumbar spinal canal stenosis at the Yaounde Central Hospital. Methods: This was a retrospective descriptive cross-sectional study for a period of 4 years, from June 2015 to June 2019. It involved all patients operated for lumbar canal stenosis and who underwent spondylodesis or spinal fusion at the neurosurgery department of the Yaounde Central Hospital. Results: A total of 68 participants were recruited during our study period. 32 (47%) of the study population were in the 50 - 60 age group, with a mean age of 56.98 years ranging from 41 to 75 years. Females, housewives and farmers were the most affected. In our study, 72% of patients had unilateral spondylodesis and 28% had bilateral fusion. Preoperatively, 71% of patients had insurmountable pain, refractory to medical treatment. At 3 months postoperatively, 73.7% of patients with bilateral setup had moderate pain compared to 69% of those with unilateral setup. At 6 months postoperatively, 79% of patients with bilateral fusion had mild pain compared to 82% of patients with unilateral setup. At 1 year postoperatively, all patients had mild pain. Preoperatively, 66.2% of patients were unable to walk and 19.1% of patients were bedridden according to the Oswestry score. At 3 months postoperatively, 10.2% of patients with unilateral setup were unable to walk compared to 10.5% of patients with bilateral fixation, while 67.3% of patients with unilateral fixation had moderate disability compared to 52.6% of patients with bilateral fixation. At 6 months postoperatively, 51% of patients with unilateral setup had moderate disability compared to 47.4% of patients with bilateral fixation, while 42.9% of patients with unilateral fixation had mild disability compared to 42.1% of patients with bilateral fixation. At 1 year postoperatively, 81.6% of patients who underwent unilateral fixation had only mild disability compared to 73.7% of patients with bilateral fixation. Conclusion: The assessment of quality of life according to the set-up used shows similar results at 3 months, 6 months and 1 year, with no statistically significant differences. Single-sided pedicle screw fixation combined with transforaminal lumbar interbody fusion or mounting has the advantage of being faster, with less bleeding and is less expensive compared to bilateral fixation. 展开更多
关键词 Lumbar Spinal canal STENOSIS INSTRUMENTATION Surgery Quality of Life
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Results Analysis of Surveys Made to Stakeholders in the Pacific Ports in the Panama Canal:A Study Focused to Improve the Efficiency of Loading/Discharging Operations
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作者 Marilyn Y.López Millán F.Xavier Martínez de Osés 《Journal of Traffic and Transportation Engineering》 2024年第6期255-263,共9页
This research aims to analyze the communication process between the different participating actors in the port of Balboa,in the Panamanian Pacific.The starting hypothesis begins with the normal operation of the port i... This research aims to analyze the communication process between the different participating actors in the port of Balboa,in the Panamanian Pacific.The starting hypothesis begins with the normal operation of the port itself.Considering which strategic actions have potential development and which specific strategic actions are proposed for their improvement,the article begins with a discussion of the nature of ports in Panama and their relationships with the Panama Canal,followed by a literary review of all the effects that climate change may have on navigation on the Panamanian Pacific coast.Next,the implication between the coordination and cooperation between the port,the Panama Canal pilots,and the other actors involved with the arrival and departure of vessels from the port will be analyzed.In a third part,the results of the perception of a significant sample of these actors who were surveyed,which are related to the process,are presented.The document concludes with recommendations on how the Panamanian Pacific port can improve its individual interests through the application of improvements derived from the results of the surveys,for more efficient inter-institutional coordination and cooperation. 展开更多
关键词 canal PANAMA ports PACIFIC
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大运河沿线居民遗产责任行为影响机制研究——基于计划行为理论视角
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作者 张磊玲 《江苏商论》 2025年第2期7-11,20,共6页
地方居民是大运河文化遗产保护传承的重要主体,其遗产责任行为对大运河文化遗产可持续发展至关重要。本研究引入地方依恋理论,以大运河苏州段为例,采用结构方程模型验证居民地方依恋、TPB与遗产责任行为之间的关系。结果表明:(1)居民地... 地方居民是大运河文化遗产保护传承的重要主体,其遗产责任行为对大运河文化遗产可持续发展至关重要。本研究引入地方依恋理论,以大运河苏州段为例,采用结构方程模型验证居民地方依恋、TPB与遗产责任行为之间的关系。结果表明:(1)居民地方依赖和地方认同显著正向影响TPB的三个维度;(2)TPB的三个维度显著正向影响居民遗产责任行为;(3)TPB的三个维度在居民地方依恋和遗产责任行为之间起中介作用。因此,大运河沿线地区应开发文创体验产品和各类消费场景,以增强地方居民与文化遗产的情感联结,从而促使其形成遗产责任行为。 展开更多
关键词 遗产地居民 遗产责任行为 大运河苏州段 计划行为理论
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Study on Tissue Culture of Leucophyta brownii ‘Canal Rocks Form’ 被引量:1
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作者 李艳敏 孟月娥 +3 位作者 赵秀山 王利民 王慧娟 张和臣 《Agricultural Science & Technology》 CAS 2013年第2期230-234,共5页
[Objective] This study aimed to establish a tissue culture technology for Leucophyta brownii ‘Canal Rocks Form’. [Method] Leucophyta brownii ‘Canal Rocks Form’ stems with axillary buds were selected as explants in... [Objective] This study aimed to establish a tissue culture technology for Leucophyta brownii ‘Canal Rocks Form’. [Method] Leucophyta brownii ‘Canal Rocks Form’ stems with axillary buds were selected as explants in vitro to investigate the effects of different concentrations of 6-BA and NAA on proliferation culture and the effects of IBA, NAA and subculture cycle on rooting culture. [Result] The results showed that Leucophyta brownii ‘Canal Rocks Form’ plantlets need low concentrations of phytohormones and the rooting culture was significantly affected by the subculture cycle; the optimal medium for proliferation culture was MS+0.5 mg/L 6-BA+0.05 mg/L NAA+30 g/L sucrose+5.5 g/L agar, with a proliferation coefficient of 4.25; the plantlets with a subculture cycle of 28 d were the most suitable for rooting culture, with a rooting rate of 95.9% in 1/2 MS+0.1 mg/L IBA+0.05 mg/L NAA+20 g/L sucrose+5.5 g/L agar, and the average number and length of roots were 4.69 and 1.68 cm, respectively. [Conclusion] This study laid the foundation for establishing sterile culture system of Leucophyta brownii ‘Canal Rocks Form’. 展开更多
关键词 Leucophyta brownii canal Rocks Form’ Propagation ROOTING Subculture cycle
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Comprehensive evaluation of water quality parameters in Tianjin Dagu Dainage Canal 被引量:1
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作者 董玉波 戴媛媛 +1 位作者 马超 孙学亮 《Marine Science Bulletin》 CAS 2014年第2期90-96,共7页
In this paper, some indices of sulfide, organic carbon, oil and heavy metals (copper, lead, zinc, cadmium, mercury, arsenic and chromium) in the sediments from Dagu Dainage Canal at the Bohai Bay during four seasons... In this paper, some indices of sulfide, organic carbon, oil and heavy metals (copper, lead, zinc, cadmium, mercury, arsenic and chromium) in the sediments from Dagu Dainage Canal at the Bohai Bay during four seasons in 2012 - 2013 are selected, and Water Quality Pollution Index (API) is applied to evaluate water quality indices, aiming for the systematic evaluation of the water quality of Dagu Dainage Canal. The results showed that four stations of D3, D6, D7and D9 for S2 had the type Ⅱand Ⅲ of water; others had the type Ⅰ ; the total level of TOC, TPH, Cu, Pb, Zn, Cd, Hg, As and Cr were type Ⅰ, Ⅳ, Ⅱ, Ⅴ, Ⅱ, Ⅴ, Ⅲ, Vand Ⅴ. Water Quality Pollution Index (API) was 3.28, which illustrated Dagu Dainage Canal was in the state of contamination and the degree of pollution exceeded the standard functional areas. 展开更多
关键词 Dagu Dainage canal water quality indices spatial and temporadistribution comprehensive evaluation
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有限元分析牙髓根尖周病根管治疗中的牙体力学性能
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作者 杨文静 格根塔娜 《中国组织工程研究》 CAS 北大核心 2025年第20期4295-4304,共10页
背景:根管治疗后牙髓根尖周病变患牙往往因失去较多健康牙体组织等原因导致抗折强度降低,如何增强牙齿抗折强度一直是临床医生密切关注的问题。有限元分析能直观地展示不同状态下患牙各个部分的受力情况,对牙体结构和材料力学性能等进... 背景:根管治疗后牙髓根尖周病变患牙往往因失去较多健康牙体组织等原因导致抗折强度降低,如何增强牙齿抗折强度一直是临床医生密切关注的问题。有限元分析能直观地展示不同状态下患牙各个部分的受力情况,对牙体结构和材料力学性能等进行综合分析。目的:综述有限元分析在牙髓根尖周病根管治疗中的应用进展,并对未来的发展趋势进行展望。方法:在PubMed、Web of Science数据库和中国知网、万方数据库、维普数据库、中国生物医学文献服务系统中检索使用有限元法分析牙髓根尖周病根管治疗的相关文献,英文检索词为“FEA,finite element analysis,stress analysis,root canal treatment,pulp opening,root canal preparation,root canal filling,restoration”,中文检索词为“有限元分析,应力分析,牙髓根尖周病,根管治疗,开髓,根管预备,根管充填,修复”,最终纳入103篇文献进行综述。结果与结论:有限元分析可以通过构建牙体及周围组织的有限元模型分析牙齿在咀嚼、咬合等过程中的应力分布和变形情况。借助有限元分析,临床研究者能够对牙髓根尖周病根管治疗中不同开髓洞型、根管预备方式、根管充填材料及修复方案等对牙体力学性能的影响进行分析,从而选择出最佳的治疗方案,提高治疗效果和患者预后。有限元分析有助于医生在临床治疗中减少牙体组织的损失,提高治疗效果和患者预后。有限元模型是对实际情况的简化,需结合临床试验进行综合分析。 展开更多
关键词 有限元分析 应力分析 牙髓根尖周病 根管治疗 开髓 根管预备 根管充填 修复 工程化口腔材料
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Ecological Design of Flood Discharging Canals in Shijiazhuang City
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作者 伊红珊 刘辉芳 《Journal of Landscape Research》 2009年第5期1-6,17,共7页
From the perspective of ecological conservation and satisfaction of people's visual and psychological demands,existing problems in the urban revetment were analyzed,and the connotation of ecological revetment as w... From the perspective of ecological conservation and satisfaction of people's visual and psychological demands,existing problems in the urban revetment were analyzed,and the connotation of ecological revetment as well as the selection of different ecological revetments according to different types of river ways was discussed. 展开更多
关键词 GARDEN FLOOD DISCHARGING canal REVETMENT Landscape
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基于共生共享理念的城市口袋公园设计研究--以2023年河北省园林绿化设计竞赛获奖作品“系住你”为例
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作者 姚望 胡振宇 吕铭洁 《城市建筑》 2025年第2期67-69,80,共4页
口袋公园是城市小型开放绿地,具有生态保护、景观观赏、社交娱乐、文化展示等功能,在城市高质量发展中起着重要作用。文章以笔者在2023年河北省园林绿化设计竞赛中的获奖作品《“系住你”--运河时光缎带主题公园设计》为例,选取竞赛指... 口袋公园是城市小型开放绿地,具有生态保护、景观观赏、社交娱乐、文化展示等功能,在城市高质量发展中起着重要作用。文章以笔者在2023年河北省园林绿化设计竞赛中的获奖作品《“系住你”--运河时光缎带主题公园设计》为例,选取竞赛指定的沧州市某废弃场地为口袋公园基地,基于与自然共生、与社会共享的理念,结合大运河文化,以时光缎带为主题,从规划布局、空间营造、持续发展三个方面对设计方案进行论述,通过一条动线串联场地,置入富有空间感的景观节点,展现出场地的生态之美,期望设计研究成果可对今后的城市口袋公园建设起到一定的借鉴作用。 展开更多
关键词 口袋公园 共生 共享 设计 运河时光缎带
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论杭州与京杭大运河城河相依关系的独特性
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作者 郑杜月 宣建华 高徐昌 《华中建筑》 2025年第1期85-89,共5页
在中国大运河流经的35个城市中,城河关系各有不同,杭州城河相依关系具有其独特性。该文通过对杭州运河历史发展过程的梳理,分析了运河穿城而过的原因,进而论述了运河对城市发展的影响,试图深入认识杭州城河相依的特点。
关键词 杭州 京杭大运河 城河相依
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乡村河道环境生态治理研究
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作者 张警文 苏霖霖 李肖阳 《黑龙江环境通报》 2025年第1期41-43,共3页
乡村河道景观规划和生态建设是城乡环境建设的重要组成部分,合理的更新改造建设可以使乡村河道发挥生态、景观、灌溉等综合功能。本文对万金渠辛庄村乡村河道现状及存在问题进行分析与研究,对比万金渠城区段的成功改造经验,着力探讨如... 乡村河道景观规划和生态建设是城乡环境建设的重要组成部分,合理的更新改造建设可以使乡村河道发挥生态、景观、灌溉等综合功能。本文对万金渠辛庄村乡村河道现状及存在问题进行分析与研究,对比万金渠城区段的成功改造经验,着力探讨如何运用“海绵城市”工程措施进行乡村河道改造,最终系统构建城乡一体化生态河道景观。 展开更多
关键词 乡村河道 万金渠 生态修复
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根管治疗术治疗牙髓炎的疗效及疗效的影响因素分析
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作者 蒲家乐 《中国医药指南》 2025年第2期115-117,共3页
目的评价根管治疗术(RCT)治疗牙髓炎的疗效,分析影响疗效的因素,为临床提供参考依据。方法选取2021年1月—12月淄博市第四人民医院完成根管治疗的168例牙髓炎患者,将治疗成功的148例患者纳入成功组,20例治疗失败的患者纳入失败组。比较... 目的评价根管治疗术(RCT)治疗牙髓炎的疗效,分析影响疗效的因素,为临床提供参考依据。方法选取2021年1月—12月淄博市第四人民医院完成根管治疗的168例牙髓炎患者,将治疗成功的148例患者纳入成功组,20例治疗失败的患者纳入失败组。比较两组恰填率、欠填率、超填率及随访2年的成功率、失败率。采用Logistics回归分析影响根管治疗效果的因素。结果RCT后X线片评价恰填率90.48%,欠填率5.36%,超填率4.17%。所有患者均随访2年,成功率88.10%,失败率11.90%。成功组患牙牙位为磨牙、有隐裂、根管及根尖状态异常、恰填的构成比例分别为55.41%、3.38%、12.84%、91.89%,对照组分别为75.00%、20.00%、40.00%、80.00%,差异有统计学意义(P<0.05)。两组患牙牙位、有无隐裂、根管及根尖状态和根充质量比较,差异有统计学意义(P<0.05)。根充质量欠填和牙位为磨牙是影响RCT疗效的主要因素(OR=1.826、1.933,P<0.05)。结论根管治疗术是牙髓炎治疗的有效方法,根充质量欠填、牙位为磨牙是影响根管治疗术疗效的主要因素。 展开更多
关键词 牙髓炎 根管治疗术 疗效 影响因素
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Tooth anatomy risk factors influencing root canal working length accessibility 被引量:9
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作者 Lu Tang Tuo-qi Sun +2 位作者 Xiao-jie Gao Xue-dong Zhou Ding-ming Huang 《International Journal of Oral Science》 SCIE CAS CSCD 2011年第3期135-140,共6页
The aim of this study was to analyze the specific influence of root canal anatomy on the accessibility of working length during root canal therapy. Four hundred seventy-six root canal therapy cases (amounting to a to... The aim of this study was to analyze the specific influence of root canal anatomy on the accessibility of working length during root canal therapy. Four hundred seventy-six root canal therapy cases (amounting to a total of 1 005 root canals) were examined. The anatomy risk factors assessed in each case included: tooth type (tooth location), root canal curvature, and root canal calcification, as well as endodontic retreatment. The investigation examined the correlation between each of these anatomic factors and the working length, with statistical analysis consisting of Chi-square tests and multiple logistic regression analysis. In an independent factor analysis, tooth type (tooth iocation), root canal curvature, canal calcification, and endodontic retreatment were determined to be the primary risk factors. In a multiple-factor regression model, root curvature and canal calcification were found to most significantly influence root canal working length accessibility (P〈0.05). Root canal anatomy increases the difficulty of root canal preparation. Appropriate consideration of tooth anatomy will assist in accurate determination of preparation difficulty before instrumentation. This study alerts clinical therapists to anatomical factors influencing the working length accessibility, and allows for a direct estimate of success rate given in situ measurements of tooth factors during the root canal treatment procedure. 展开更多
关键词 root canal anatomy root canal preparation root canal treatment working length
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Effect of vasectomy via inguinal canal on spermatogenesis in rabbits 被引量:8
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作者 Bin Peng Ya-Ping Wang +2 位作者 Yi Shang Yang Guo Zheng-Wei Yang 《Asian Journal of Andrology》 SCIE CAS CSCD 2008年第3期486-493,共8页
Aim: To determine whether vasectomy away from the epididymal tail (via the inguinal canal) in rabbits can reduce the early postoperative effects on spermatogenesis. Methods: Twenty-nine normal male Japanese white ... Aim: To determine whether vasectomy away from the epididymal tail (via the inguinal canal) in rabbits can reduce the early postoperative effects on spermatogenesis. Methods: Twenty-nine normal male Japanese white rabbits (aged 4- 6 months) were subjected to unilateral close-ended (conventional) or open-ended (the cut end of the juxta-epididymal vas deferens not ligated) vasectomy via the inguinal canal. Ten days and 3 months after operation, testes, epididymides and vasa deferentia were removed and methacrylate resin-embedded sections prepared. The histology of the testis, epididymis and vas deferens was examined under light microscope, and the volume and diameter of the seminiferous tubules were quantitatively studied using stereological methods. Results: Neither of the methods of vasectomy led to apparent damage to spermatogenesis on the vasectomized side in comparison with the contralateral shamoperated side, but the juxta-epididymal vas deferens on the vasectomized side was highly distended and contained numerous sperm 3 months after operation. Conclusion: Vasectomy away from the cauda epididymis has no significant early postoperative effects on spermatogenesis in rabbits. 展开更多
关键词 VASECTOMY inguinal canal SPERMATOGENESIS TESTIS RABBITS
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两种根管治疗术对慢性根尖炎患者疗效及预后的影响比较
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作者 李崇娟 刘玉 孙蕾 《中国美容医学》 2025年第1期158-161,共4页
目的:研究两种根管治疗(Root canal therapy,RCT)方法对慢性根尖炎患者疗效和预后的影响。方法:选取2019年10月-2022年10月笔者医院就诊的128例慢性根尖炎患者,按随机数字表法分为试验组和对照组,每组63例(两组在治疗或随访过程中各脱落... 目的:研究两种根管治疗(Root canal therapy,RCT)方法对慢性根尖炎患者疗效和预后的影响。方法:选取2019年10月-2022年10月笔者医院就诊的128例慢性根尖炎患者,按随机数字表法分为试验组和对照组,每组63例(两组在治疗或随访过程中各脱落1例)。对照组采用常规RCT,试验组采用掺铒钇铝石榴石(Er∶YAG)激光冲洗辅助一次性RCT,比较两组患者疗效及预后效果。结果:试验组治疗成功率高于对照组(P<0.05);治疗后,试验组牙周探诊深度(Probing depth,PD)、龈沟出血指数(Sulcus bleeding index,SBI)、菌斑指数(Probing depth,PI)均低于对照组(P<0.05);治疗后,试验组咀嚼效率和咬合力均高于对照组,牙齿松动度和牙龈指数低于对照组(均P<0.05);治疗后,试验组C反应蛋白(C-reactive protein,CRP)、白细胞介素-2(Interleukin-2,IL-2)、白细胞介素-8(Interleukin-8,IL-8)、肿瘤坏死因子α(Tumor necrosis factor-α,TNF-α)均低于对照组(P<0.05),随访6个月后,试验组根尖周指数(Periapical index,PAI)评价优于对照组,根尖炎复发率低于对照组(均P<0.05)。结论:Er∶YAG激光冲洗辅助一次性RCT治疗较常规RCT疗效更显著,有效减轻炎症反应,改善牙周状态和咀嚼功能,预后更佳。 展开更多
关键词 根尖炎 慢性 根管治疗 激光 咀嚼功能 炎症
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An in vitro study on the efficacy of removing calcium hydroxide from curved root canal systems in root canal therapy 被引量:8
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作者 Ying Wang Li-Yang Guo +5 位作者 Hong-Zhi Fang Wen-Ling Zou Ying-Ming Yang Yuan Gao Hui Yang Tao Hu 《International Journal of Oral Science》 SCIE CAS CSCD 2017年第2期110-116,共7页
To compare the efficacy of various irrigants(citric acid, ethylenediaminetetraacetic acid(EDTA) and Na OCl) and techniques in removing Ca(OH)2in two types of curved root canal systems, simulated root canals with speci... To compare the efficacy of various irrigants(citric acid, ethylenediaminetetraacetic acid(EDTA) and Na OCl) and techniques in removing Ca(OH)2in two types of curved root canal systems, simulated root canals with specific curvatures were used to investigate the effects of different irrigants and instruments on Ca(OH)2removal. The optimal methods were verified on extracted human teeth. Simulated root canals were assigned to one of two groups based on the irrigation solution: 10% citric acid or2.5% Na OCl. Each group was divided into four subgroups according to the technique used to remove Ca(OH)2. The percentage of Ca(OH)2removal in different sections of root canals was calculated. On the basis of the results obtained for the simulated canals, 10% citric acid and 17% EDTA were applied to remove Ca(OH)2from the extracted human teeth with curved root canal systems. The teeth were scanned by micro computed tomography to calculate the percentage of Ca(OH)2removal in the canals.In simulated root canals, we found that 10% citric acid removed more Ca(OH)2than 2.5% NaOCl in the 0–1 mm group from the apex level(Po0.05). Ultrasonic and Endo Activator activation significantly removed more Ca(OH)2than a size 30 K file in the apical third(Po0.05). However, there were no significant differences in any sections of the canals for 10% citric acid or 17%EDTA in removing Ca(OH)2in extracted human teeth. We concluded that it was effective to remove residual Ca(OH)2using the decalcifying solution with Endo Activator or Passive Ultrasonic Irrigation in a curved root canal system. A protocol for Ca(OH)2removal was provided based on the conclusions of this study and the methods recommended in previous studies. 展开更多
关键词 calcium hydroxide curved root canal system IRRIGATION REMOVAL
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Pathophysiology, diagnosis and treatment of intermittent claudication in patients with lumbar canal stenosis 被引量:15
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作者 Shigeru Kobayashi 《World Journal of Orthopedics》 2014年第2期134-145,共12页
Spinal nerve roots have a peculiar structure, different from the arrangements in the peripheral nerve. The nerve roots are devoid of lymphatic vessels but are immersed in the cerebrospinal fluid(CSF) within the subara... Spinal nerve roots have a peculiar structure, different from the arrangements in the peripheral nerve. The nerve roots are devoid of lymphatic vessels but are immersed in the cerebrospinal fluid(CSF) within the subarachnoid space. The blood supply of nerve roots depends on the blood flow from both and peripheral direction(ascending) and the spinal cord direction(descending). There is no hypovascular region in the nerve root, although there exists a so-called water-shed of the bloodstream in the radicular artery itself. Increased mechanical compression promotes the disturbance of CSF flow, circulatory disturbance starting from the venous congestion and intraradicular edema formation resulting from the breakdown of the blood-nerve barrier. Although this edema may diffuse into CSF when the subarachnoid space is preserved, the endoneurial fluid pressure may increase when the area is closed by increased compression. On the other hand, the nerve root tissue has already degenerated under the compression and the numerous macrophages releasing various chemical mediators, aggravating radicular symptomsthat appear in the area of Wallerian degeneration. Prostaglandin E1(PGE1) is a potent vasodilator as well as an inhibitor of platelet aggregation and has therefore attracted interest as a therapeutic drug for lumbar canal stenosis. However, investigations in the clinical setting have shown that PGE1 is effective in some patients but not in others, although the reason for this is unclear. 展开更多
关键词 LUMBAR canal STENOSIS Cauda EQUINE Nerve root PROSTAGLANDIN E1 Blood flow
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