Low surface tension calcium hydroxide solution is an effective antiseptic

The antimicrobial effects of a saturated calcium hydroxide solution, and in combination with 10% and 20% detergent, were evaluated on Streptococcus faecalis. Strepto-coccus sanguis, Streptococcus mutans, Streptococcus salivarius, Neisseria sp., diphlheroid, Staphylococcus aureus, Lactobacillus sp., Staphylococcus epidermidis, Bacillus suhtilis and Candida albicans. The saturated calcium hydroxide solution was effective against only four of the 11 microorganisms studied over a 60-min exposure time. The calcium hydroxide solutions con-taining detergent killed all 11 test organisms over a 30-min exposure time. This difference was statistically significant (P<0.01). No statistically significant difference in antimicrobial action was found between the 10% and 20% detergent calcium hydroxide solutions (F>0.01). However, the low surface tension (46.5 × 10^?3 Nm^?1) and high pH (10.8) of the calcium hydroxide solution with 20% detergent establish it as the more effective solution.     

牙髓根管感染厌氧菌培养结果分析

从３４例牙髓根管感染中共分离出厌氧菌１１８株，经菌属分类依次为消化链球菌属，拟杆菌属，梭杆菌属，放线菌属，韦荣氏球菌属和珠网菌属，其中前３属为７７株，分离率为６５．３％，这一结果显示该３属细菌与极管感染有密切关系，是牙髓根管感染的优势菌。     

两种根管弯曲度测量法间数学关系的推导

目的:研究2种根管弯曲度测量法测值(Schneider法的测值为θS,Weine法的测值为θW)间的数学关系。方法:将弯曲根管长轴简化为依次由相切的线段(长度为l1)、圆弧(半径为r、圆心角为θ)、线段(长度为l2)组成的连线,根据2测量法确定简化弯曲根管长轴测量角时不同的定点、连线方式,推导θS、θW间的函数方程以及与l1、l2、r、θ间的数学关系,分析方程与函数图形的特征。结果:θS与θW间存在以下数学关系:(1)tanθS=(1-cosθW ksinθW)/(sinθW kcosθW),k=l2/r;(2)θW/2≤θS≤θW。k取不同值时函数曲线的形态具有不同的特点。θW在0,π的区间内,θS与θW间呈近似的线性关系;k越大,θS越接近θW,k越小,θS越接近θW/2。结论:Schneider法与Weine法测值间存在着复杂的函数关系,根管根尖部直段的长度(l2)与弯曲段曲率半径(r)之比值是影响2种方法测值间差异的重要因素。     

ROOT ZX根管长度测量仪临床应用评价

目的 评价森田ROOT ZX根管长度测量仪临床应用价值.方法 用根管长度测量仪对108例根管进行根管测量,以此长度进行根管预备后,按测量长度插入牙胶尖摄X线牙片,计算出实际根管长度,求得测量准确率.结果 ROOT ZX测量准确率为92.6%.结论 ROOT ZX根管长度测量仪应用安全可靠、准确率高.     

椎管内原发性孤立性纤维性肿瘤临床病理观察(附2例报告)

目的探讨椎管内孤立性纤维性肿瘤的临床病理特征、诊断和鉴别诊断,以期提高对该肿瘤的诊断水平。方法复习2例椎管内原发性孤立性纤维性肿瘤的临床资料,并观察其组织学特征和免疫组化标记。结果2例患者男、女各1例,年龄分别为23岁和32岁,临床表现为局部神经压迫症状。MRI示椎管内髓外硬膜内占位。组织学特征为梭形、卵圆形细胞呈束状、波浪状或旋涡状排列,富于胶原纤维及伴有分支状薄壁血管。细胞未见异型性和核分裂像。免疫组化示瘤细胞Vimentin( ),CD34( ),CD99( ),Bcl-2( ),AACT(-),Actin(-),S-100(-),EMA(-),GFAP(-),CD68(-),CD117(-),SMA(-),NF(-)。结论椎管内原发性孤立性纤维性肿瘤是一种罕见的肿瘤,诊断主要依靠病理形态学及免疫组化,并应与椎管内的其他梭形细胞肿瘤鉴别。     

机械通气患者体位改变插入胃管效果与分析

目的提高有创机械通气患者插入胃管的成功率,减少因反复插管所致的并发症,减轻患者痛苦,提高护士的工作效率。方法把有创机械通气的60例患者,随机分为观察组30例和对照组30例,观察组采取改变常规的“去枕头后仰位”为“抬高床头70°~80°角,头正位”插入胃管,对照组采取常规的去枕头后仰卧位的体位方法插入胃管。结果对照组一次插管成功率为6.66%,观察组一次插管成功率为90%,经统计学分析,差异有显著意义(P<0.01)。结论有创机械通气患者改变常规的“去枕头后仰位”为“抬高床头70°~80°角,头正位”后一次插入胃管成功率明显提高。     

试尖对根管充填质量影响的研究

目的：了解试尖对侧向加压法根管充填质量的影响因素。方法：随机提取我院1998年10月至2004年12月所完成的根管充填病例的X线片1000例，按试尖与未试尖，分别对前牙、前磨牙和磨牙根管充填质量进行分析。结果：在482例未试尖根管充填病例中，前牙、前磨牙和磨牙的适充比例分别为46％、37％和23％，欠充为20％、29％和47％。超充为34％、33％和29％：在518例试尖病例中，前牙、前磨牙和磨牙的适充比例分别为68％、62％和51％，欠充为6％、12％和13％，超充为25％、24％和36％。结论：在侧向加压法根管充填中，试尖可明显改善充填质量。     

Ultrasonography in the detection of cervical incompetency

In 80 pregnancies with clinical and ultrasonic signs of cervical incompetency, the length of the cervix and the thickness of the anterior wall of a lower uterine segment have been evaluated ultrasonically. We have also measured the width of the endocervical canal and studied the prolapse of fetal membranes (with fetal parts) into the endocervical canal. We evaluated these same parameters in 80 healthy pregnancies. The length of the cervix, the thickness of the anterior wall of a lower uterine segment, and the width of the endocervical canal were followed longitudinally in the patients from the 10th to the 36th gestation week. No statistically significant differences between age groups were found. In four age groups at risk for cervical incompetency, cervical lengths and wall thickness were significantly different (p less than 0.001) from those in comparable controls. Forty-five percent of the patients in the at-risk group, with cervical cerclage, delivered at 37.3 (range: 32 to 41) weeks and 6.25% of pregnancies ended in abortion when the amniotic membrane herniated into the cervical canal, with or without some part of the fetus.     

翼管的多层螺旋CT影像解剖学研究

目的探讨正常翼管在多层螺旋CT(MSCT)及其重组图像上的影像解剖学特点和临床应用价值。方法对60例健康成年人和40例颌面部外伤病人(病变未波及翼管)进行MSCT颌面部轴位薄层螺旋扫描后,进行后处理重建,包括多平面重组(MPR)和容积显示(VR),并对三维图像进行旋转、切割及测量。结果翼管的形态、走行及其周围毗邻结构可在MSCT轴位扫描图像、MPR及VR三维切割图像中得到全面、清晰、立体直观的显示。结论多层螺旋CT二维及三维重建图像相结合可清晰、立体直观的认识翼管及其周围邻近骨性结构。