Fluoride bioactive glass paste improves bond durability and remineralizes tooth structure prior to adhesive restoration

ObjectiveThe current study aimed at examining a fluoride containing bioactive glass (BiominF®) paste as a temporary filling material capable of remineralizing the demineralized enamel or dentin, and its ability to decrease a simulated dentinal fluids pressure on the resin/dentin interface, without affecting the shear bond strength of a universal bonding agent to enamel and dentin.Methods60 premolars were utilized for the acid resistance, trans-microradiography (TMR) and shear bond strength (SBS) experiments. Enamel and dentin discs were demineralized for 4 days to create a subsurface demineralized zone followed by applying BiominF® paste, 1.23% acidulated phosphate fluoride, or a temporary filling material for 24 h.30 extracted human non-carious third molars were utilized for the pulpal pressure experiment in which direct communication to the pulp chamber was created by cutting at a level approximately 1 mm below the cemento-enamel junction while the coronal enamel was ground to expose mid coronal dentin. The dentin surface was exposed to a simulated pulpal pressure. The dentin surfaces had BiominF® paste, an oxalate desensitizing agent, or temporary filling material followed by application of a universal adhesive system.ResultsOne way ANOVA showed that BiominF® paste remineralized effectively the demineralized enamel or dentin, did not affect the bond strength of the enamel and dentin surfaces to the tested adhesive system p < 0.05, and improved the acid resistance of the demineralized enamel and dentin against a secondary erosive challenge. Moreover, BiominF® paste decreased the nanoleakage expression in the dentin/adhesive interface exposed to a simulated pulpal pressure.SignificanceBiominF® paste may serve as a temporary filling material that may improve the longevity of adhesive restorations and help to conserve tooth structures by preserving the demineralized enamel and dentin form cutting during cavity preparation.     

先天性色素痣伴增生性结节10例临床病理分析

【摘要】 目的 探讨先天性色素痣伴增生性结节的临床特点及组织病理特征。方法 收集第四军医大学西京皮肤医院2015—2019年经临床和病理确诊的10例先天性色素痣伴增生性结节患者的临床及病理资料，并进行回顾性分析。结果 10例患者年龄2～45岁（平均15岁），9例增生性结节发生于婴儿，1例发生于成人。皮损位于四肢4例，头面部3例，躯干2例，躯干及四肢同时受累1例。临床表现为黑色斑片或斑块中出现1个或多个结节，6例增生性结节为多发，4例为单发，单个结节直径0.2～1.5 cm，仅1例出现溃疡。组织病理检查显示增生性结节内黑素细胞均存在成熟现象，核分裂象少，细胞无明显异型性，无坏死现象，免疫组化检查显示痣细胞弥漫表达Melan-A，不表达或仅部分表达HMB45，Ki67增殖指数 < 5%。结论 先天性色素痣伴增生性结节可发生于四肢、头面部及躯干；临床表现为原先天性色素痣皮损上的单发或多发结节；病理上增生性结节内黑素细胞可见成熟现象，免疫组化HMB45及Ki67染色有助于诊断，其预后有待长期随访。     

甲状腺结节细针穿刺检查的临床病理分析

目的:评价甲状腺结节细针穿刺检查价值,并进行临床病理结果分析,从而为甲状腺结节患者的临床诊断、治疗工作提供参考。方法:选择2018年7月~2019年7月本院收治的200例甲状腺结节患者,予以单纯超声检查的患者作为对照组,超声辅助细针穿刺检查的患者作为观察组。比较不同检查方法下2组检查的准确率、灵敏度、特异性以及病理检查良性、恶性情况,并分析观察组检查患者的风险性情况。结果:此次受试的200例甲状腺结节患者中,观察组检查准确率、灵敏度均明显高于对照组,P<0.05。组间特异性差异无显著性,且观察组患者的安全性较高,P>0.05。结论:甲状腺结节细针穿刺检查灵敏度较高,能够有效区分甲状腺疾病患者的疾病类型以及结节性质等情况,从而为疾病治疗提供参考。     

HBV相关肝硬化结节的多模态超声诊断价值

目的采用多模态超声对HBV相关肝硬化背景内结节进行评估并分类。方法选取2013年10月~2016年10月于浙江中医药大学附属杭州市西溪医院就诊的HBV相关性肝硬化患者200例,其中病理诊断为增生结节(RN)者51例,不典型增生结节(DN)者57例,其中低级别不典型增生结节(LGDN)27例,高级别不典型增生结节(HGDN)30例,肝细胞肝癌(HCC)为17例,均行多模态二维超声、彩色多普勒、超声造影检查,对比不同病理类型的结节多模态超声特征性表现,进一步将肝硬化背景肝内结节分为Ⅰ、Ⅱ、Ⅲ、Ⅳ4类。采用χ~2检验比较不同大小、超声造影不同增强模式肝硬化背景肝内DN及HCC检出率的差异。结果直径2.0~3.0 cm结节25个,均为HCC与DN;直径1.0~2.0 cm结节94个,4个为HCC,24个为HGDN;直径1.0 cm结节6个,全部为RN;不同大小肝硬化背景肝内结节HCC与DN检出率差异有统计学意义(P0.05)。RN结节主要以"等进等出"增强模式为主,LGDN主要以"慢进等出"增强模式为主,HGDN及HCC主要以"快进快出"增强模式为主,不同组间不同的增强模式差异有统计学意义(P0.05);而HCC与HGDN在造影剂进入时间、达峰时间、流出时间上差异有统计学意义(P0.05),Ⅲ类、Ⅳ类结节在DN及HCC检出率上差异有统计学意义(P0.05)。结论多模态超声对于HBV相关肝硬化肝内结节进行评估、分类,对于HGDN及HCC早期诊断有一定帮助。     

Reinforcement in removable prosthodontics: a literature review

Removable prosthodontics are often associated with mechanical troubles in daily use, such as fracture or deformation. These troubles render prostheses unusable and reduce wearers’ QOL. Various reinforcements are used to prevent such problems, but consensus on reinforcement has not been reached. This review aimed to summarise the effects of reinforcement and to propose favourable reinforcement based on material, design and position in the prostheses. Initially, 139 articles were selected by electronic and manual searches. After exclusion of 99 articles based on the exclusion criteria, 40 articles were finally included in the review. Electronic searches were performed for articles published from 2005 to 2015 in PubMed, EMBASE, MEDLINE and Cochrane Library, and manual searches were performed in 10 journals relevant to the topic of removable prosthodontics. For in vitro studies, certain dental alloys and fibres were mainly used. Their forms were different, including complicated forms in dental alloys and various forms in fibres. The materials were examined for mechanical properties like fracture strength, flexural strength and elastic modulus and compared with one another or without reinforcement. There were a few clinical studies and one longitudinal study. Cast metal reinforcement seemed to be most favourable in terms of fracture toughness and stiffness. The most favourable forms differed depending on the prostheses, but placement around thin and deformable areas was effective. However, randomised or longitudinal clinical reports and comparative clinical studies on the use of reinforcement were still lacking and such studies are necessary in the future.     

术中超声在甲状腺小结节切除术中的应用价值

目的 探讨术中超声在甲状腺小结节切除术中的应用价值.方法 我院37例拟行甲状腺结节切除术的患者(共48个结节),纳入标准为未凸出甲状腺包膜的小结节(最大长径≤2.0 cm),术前对甲状腺结节进行常规超声检查,初步明确结节的形态、大小、数量、边界、内部回声、钙化、低回声晕、血液供应、与邻近组织关系等特征,尤其是结节与邻近组织的关系,如距腺体表面距离、距内侧缘气管距离、距外侧缘颈动脉距离、距甲状腺腺体上下极距离等;术中应用专用术中超声探头对甲状腺结节进行精确的术中定位,指导手术操作,并确定术后结节是否完全切除.结果 16个结节靠外科术者术中触诊可大致确认位置,并利用超声扫查进一步确认;另32个结节由于位置较深或质地较软,触诊不明确,均在术中超声指导下定位.借助术中超声的实时引导和监测,所有甲状腺拟切除结节均完全切除.术后1个月超声复查,已切除的甲状腺结节均未检出残留,均未出现甲状腺功能减低.结论 术中超声对未凸出甲状腺腺体表面的小结节切除术具有指导作用,使手术操作更精确,防止结节漏切,并能避免术后甲状腺功能减低的发生,值得临床广泛推广.     

Characterization and induction of cementoblast cell proliferation by bioactive glass nanoparticles

Cementum is a mineralized tissue that lines the surface of the tooth root enabling attachment of the periodontal ligament to the root and surrounding alveolar bone. Studies examining the mechanisms involved in the formation of root cementum have been hindered by an inability to isolate and culture the cells required for cementum production (cementoblasts). This study isolated and characterized cementoblast cells derived from rat molar periodontal ligament. It was observed that the isolated cells expressed F‐Spondin, a cementoblast marker, while F‐Spondin expression was not observed in the cells of other tissues such as gingival fibroblasts and osteoblasts. As expected, the isolated cementoblast cells also expressed osteocalcin (OC), bone sialoprotein (BSP), alkaline phosphatase (ALP), and type I collagen, demonstrating the presence of mineralized tissues genes in cementoblast cells. These cells showed high ALP activity and calcified nodule formation in vitro. Since cementogenesis could be a critical event for regeneration of periodontal tissues, this study investigated whether bioactive glass particles could affect the proliferation of cementoblasts since they are known to enhance osteoblast proliferation. It was found that the ionic products from bioactive glass nanoparticles increased cementoblast viability, mitochondrial activity, and induced cell proliferation. Together, these results show the characterization of cementoblast cells from rat molar periodontal ligament. Additionally, it was shown that bioactive glass nanoparticles induced cementoblast to proliferate, indicating that they could be a potential material for use in cement regeneration through tissue engineering. Copyright © 2011 John Wiley & Sons, Ltd.     

加味八正散治疗尿路结石的临床观察

目的:观察加味八正散治疗尿路结石的临床疗效.方法:将84例尿路结石患者随机分为治疗组和对照组,每组各42例,对照组给予大量喝普通的纯净水,治疗组给予同等剂量的加味八正散治疗,10天为一个疗程,各观察两个疗程.结果:治疗组总有效率88.10%,对照组总有效率率69.05%.治疗组疗效明显优于对照组,两组比较差异具有统计学意义(P＜0.05).结论:采用加味八正散治疗尿路结石疗效明显,无明显毒副作用.