替牙晚期安氏Ⅲ类错畸形矫治后的髁突和下颌位置变化

目的探讨矫治替牙晚期安氏Ⅲ类错畸形后髁突和下颌位置的变化。方法选择患有替牙晚期安氏Ⅲ类错畸形的患者32例作为研究对象,均行前方牵引联合直丝弓矫治技术矫正,收集患者治疗前后的X线头颅侧位片进行头影测量分析。结果试验组患者矫治后的鞍角、Y轴角、下颌平面角、上齿槽座点-鼻根点-下齿槽座点角、颌凸角、髁顶点Co到y轴的距离等明显增大,面角、上下齿槽座角、髁顶点Co到x轴的距离、颏前点Pog到y轴的距离等明显减小,且差异具有统计学意义(P<0.05)。结论替牙晚期安氏Ⅲ类错患者通过正畸治疗后,下颌骨的生长可受到一定抑制,有效改善了上下颌骨的矢状不调状况,髁突点向后上移位,下颌的位置会发生明显的后移,并以髁突为中心发生了顺时针旋转。     

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口腔细菌产碱代谢与牙菌斑酸碱平衡、细菌微生态平衡以及龋病的发生、发展密切相关。口腔细菌产碱代谢研究主要集中在尿素代谢、精氨酸代谢、精胺代谢和苹果酸代谢的调控机制及其与龋活跃程度的关系方面,是近年来龋病防治的研究热点。本文着重针对口腔细菌产碱代谢的临床研究做一综述。     

微型种植体导致牙龈上皮异位植入的可能性初探

目的:初步探讨微型种植体植入时携带牙龈上皮进入牙槽骨的可能性。方法:以Beagle犬为实验动物,在种植部位牙龈处注射含GFP的2型腺相关病毒(adeno-associated viral-2-green fluorescent protein,AAV2-GFP)。3周后采用无切口植入方式植入12枚微型种植体,并于当天处死动物,制作连续组织切片,通过GFP荧光和角化蛋白免疫组化检测种植体周围牙龈上皮是否存在。结果:两种检测方法均未发现种植体-骨界面有牙龈上皮的存在。结论:微型种植体植入时未发现携带牙龈上皮进入牙槽骨。     

Neonatal screening for severe primary immunodeficiency diseases using high-throughput triplex real-time PCR

Severe combined immunodeficiency (SCID) and X-linked agammaglobulinemia (XLA) are inborn errors of immune function that require prompt diagnosis and treatment to prevent life-threatening infections. The lack of functional T or B lymphocytes in these diseases serves as a diagnostic criterion and can be applied to neonatal screening. A robust triplex PCR method for quantitation of T-cell receptor excision circles (TRECs) and κ-deleting recombination excision circles (KRECs), using a single Guthrie card punch, was developed and validated in a cohort of 2560 anonymized newborn screening cards and in 49 original stored Guthrie cards from patients diagnosed with SCID, XLA, ataxia-telangiectasia, Nijmegen-breakage-syndrome, common variable immunodeficiency, immunoglobulin A deficiency, or X-linked hyper-IgM syndrome. Simultaneous measurement of TREC and KREC copy numbers in Guthrie card samples readily identified patients with SCID, XLA, ataxia-telangiectasia and Nijmegen-breakage-syndrome and thus facilitates effective newborn screening for severe immunodeficiency syndromes characterized by the absence of T or B cells.     

心室晚电位在Brugada综合征患者心律失常事件的预测价值

目的 探讨心室晚电位(LP)预测Brugada综合征患者发生心律失常事件的价值.方法 43例Brugada综合征患者分为有症状组(24例)和无症状组(19例).采用信号平均心电图(SAECG)检测所有患者的心室晚电位;动态随访(33.8±9.0)个月,观察研究人群中心律失常事件的发生情况. 结果 有症状组中有22例(91.7％)患者晚电位阳性,无症状组中有7例(36.8％)晚电位为阳性.LP阳性的Brugada综合征患者心律失常事件发生率为72.4％,LP阴性的Brugada综合征患者心律失常事件发生率为14.3％,LP预测心律失常事件发生的相对危险度(RR)为5.1,95％可信区间(CI)为[1.4,18.6](P=0.002). 结论 心室晚电位可以作为Brugada综合征患者发生心律失常事件的有效预测因子之一.     

The dimensionality of between‐person differences in white matter microstructure in old age

Between‐person differences in white matter microstructure may partly generalize across the brain and partly play out differently for distinct tracts. We used diffusion‐tensor imaging and structural equation modeling to investigate this issue in a sample of 260 adults aged 60–87 years. Mean fractional anisotropy and mean diffusivity of seven white matter tracts in each hemisphere were quantified. Results showed good fit of a model positing that individual differences in white matter microstructure are structured according to tracts. A general factor, although accounting for variance in the measures, did not adequately represent the individual differences. This indicates the presence of a substantial amount of tract‐specific individual differences in white matter microstructure. In addition, individual differences are to a varying degree shared between tracts, indicating that general factors also affect white matter microstructure. Age‐related differences in white matter microstructure were present for all tracts. Correlations among tract factors did not generally increase as a function of age, suggesting that aging is not a process with homogenous effects on white matter microstructure across the brain. These findings highlight the need for future research to examine whether relations between white matter microstructure and diverse outcomes are specific or general. Hum Brain Mapp, 2013. © 2012 Wiley Periodicals, Inc.     

TGF-β1抑制大鼠创伤性颅脑损伤后海马神经元的凋亡

目的转化生长因子β1（TGF-β1）在星形胶质细胞增生和神经元的存活方面都发挥这重要作用,但是其在创伤性颅脑损伤（TBI）中的作用还未见报道。方法本课题组先前的研究利用大鼠模型发现在大鼠颅脑损伤后,TGF-β1的表达显著上调,表明TGF-β1参与到创伤性颅脑损伤修复的过程中。结果本研究聚焦在TGF-β1对TBI后海马神经元凋亡的影响,神经元的免疫荧光染色和Westernblot结果显示：对TBI后的海马神经元给予适当浓度及时程的TGF-β1处理,海马神经元的的凋亡明显降低。结论这些结果的发现,将有助于更好的理解TGF-β1在大鼠创伤性颅脑损伤中的作用,也有望使得TGF—β1成为临床上救治创伤性颅脑损伤的靶点。