抗生素糊剂充填乳牙根管疗效观察

目的 探索一种疗程短、疗效好、患儿及家长易接受的根管治疗方法.方法 选择需行根管治疗的患儿162例,常规根管清理,试验组用抗生素糊剂充填乳牙根管,对照组用氢氧化钙糊剂,比较两组疗效.结果 经1年随访观察,抗生素组和氢氧化钙组乳牙根管充填成功率差异无显著意义.结论 用抗生素糊剂一次充填乳牙根管疗程短、疗效好,值得临床推广使用.     

Post-traumatic recto-spinal fistula

Acquired recto-spinal fistula has been described elsewhere as a rare complication of colorectal malignancy and Crohn's enterocolitis. We treated a young man who developed a recto-spinal fistula as a result of a high fall injury. The patient presented with meningeal signs, sepsis and perianal laceration. Computerized axial tomography revealed air in the supersellar cistern. Gastrografin enema showed that contrast material was leaking from the rectum into the spinal canal. Surgical management included a diverting sigmoid colostomy, sacral bone curettage and wide presacral drainage. To the best of our knowledge, rectospinal fistula of traumatic origin has not been previously reported in the English literature. Received: 7 December 1998; Revised: 10 May 1999; Accepted: 10 May 1999     

附子水煎剂对家兔离体肺动脉血管的舒张作用

目的:研究附子Monkshood Root(DMR)水煎剂对肺动脉环的舒张作用及机制.方法:采用家兔离体肺动脉平滑肌标本,以去甲肾上腺素(NA)预收缩肺动脉后,给予不同剂量的附子观察其张力变化,并探讨去除血管内皮、给予NO合酶抑制剂左旋硝基精氨酸(L-NNA)、甲烯蓝(MB)、环氧酶抑制剂吲哚美辛和β肾上腺素能受体阻断剂普萘洛尔对血管张力变化的影响.结果:附子对血管环静息张力无明显影响,但不同剂量的附子可使10-6mol·L-1NA预收缩血管产生明显舒张(r=0.71,P＜0.001).去除血管内皮、10-4mol·L-1L-NNA或10-5mol·L-1MB可减弱附子的舒张作用.另外,1 mg·mL-1DMR对无内皮血管环NA和KCl的量效曲线无明显影响,DMB温育前后NA的PD2值为7.56±0.95和7.30±0.83,P＞0.05;KCl的PD2值为1.74±0.48和1.71±0.51,P＞0.05.结论:附子水煎剂对肺动脉的舒张作用是内皮依赖性,与内皮细胞释放的NO有关,而与平滑肌细胞膜上的受体依赖性Ca2 通道和电压依赖性Ca2 无关.     

根充术和干髓术治疗乳牙牙髓炎的比较性研究

目的:比较不同充填方法在乳牙中牙髓炎治疗效果.方法:序贯对100颗乳牙牙髓炎随机分为2组,分别用根管充填和干髓治疗两种方法.结果:氧化锌丁香油根管充填术治疗组成功率为92%,而干髓术治疗乳牙牙髓炎成功率仅为48%.结论:根管充填术较干髓术疗效更肯定,减少患儿群体复诊数和人均复诊次数,有利于临床推广.     

Exostoses of the external auditory canal: a long‐term follow‐up study of surgical treatment

To determine the postoperative incidence, extent and recurrence rate of exostoses of the external auditory canal in a cohort of patients involved in different water sports. A cross‐sectional study of 31 patients (46 ears), with exostoses treated by surgery in the Royal Cornwall Hospital between 1980 and 1999. A questionnaire was used to obtain information about the type of water exposure pre‐ and postoperatively. The extent of recurrent stenosis was assessed. The mean postoperative time interval was 10 years (sd = 4.5 years). The degree of stenosis was assessed as: minimal (<30%) in 42.6%, moderate (30–60%) in 31% and severe (>60%) in 25% of ears. The Cox regression model was used to identify factors associated with a reduction in the recurrence rate of stenosis. The use of ear plugs was highly significant (P = 0.015), as was the age of the patient at the time of operation (P = 0.004), i.e. the older the patient, the faster recurrent disease developed. There was no evidence to show that either the type or seasonal pattern of water sport activity influenced recurrence of the disease postoperatively, although preoperatively, the stenosis was more marked in association with surfing and sailing. Exostoses developed faster preoperatively in those who were in the water all year round rather than just the summer months. Of five patients who stopped water sport activity completely after surgery, four of them developed significant recurrent exostoses (>50% stenosis).     

Vitapex糊剂用于乳牙根管充填的疗效观察

目的 :比较氧化锌丁香油糊剂和 Vitapex糊剂作为乳牙根管充填材料的临床疗效。方法 :用两种根管充填材料对乳磨牙进行根管充填 ,实验组用 Vitapex糊剂根管充填 ,对照组用氧化锌碘仿糊剂根管充填 ,观察 1年后的疗效。结果 :实验组平均有效率为 97.1% ,对照组有效率为 94 .2 % ,实验组和对照组无显著统计学差异 ( P>0 .0 5 )。结论 :Vitapex糊剂用于乳牙根管充填的疗效比较理想     

椎弓根内固定在下腰椎失稳伴椎管狭窄手术中的应用

目的：探讨下腰椎失稳伴椎管狭窄的手术要点及椎弓根内固定在手术中的作用和意义。方法：总结2001年5月～2004年6月采用后路椎管减压、椎弓根内固定及椎间关节融合、横突间植骨治疗的32例下腰椎失稳伴椎管狭窄病例的临床资料。结果：32例随访6个月-40个月，平均19．5个月，术后跛行改善者32例（100％），下肢肌力障碍恢复22例（68．7％），肌萎缩14例均有所恢复；28例感觉障碍者，完全恢复18例（64．3％），部分恢复6例（21．4％）。无明显恢复2例（7．1％）。结论：下腰椎失稳伴椎管狭窄可分别表现为结构性和动力性腰椎滑脱，椎弓根内固定对病人可起到使滑脱椎体复位、相邻椎体间稳定及椎间融合的作用，并可使摘除椎间盘后的相关间隙高度得到维持。充分解除神经受压症状。     

根龋的根面易感性分析

目的:分析根面龋与根面易感性的关系。方法:采用分层随机抽样方法,对唐山市600名40岁以上中老年人进行口腔健康检查,数据应用SAS8.0软件进行单因素分析。结果:根面龋易感性高的根面为前牙、下颌前磨牙、磨牙的唇(颊)面、下前牙与上颌磨牙的舌面、前磨牙的远中面、磨牙的近中面。结论:根面是根龋的易感因素。     

根管治疗是否恰填疗效对比

目的研究在根管治疗中根充长度对疗效的影响。方法对200颗根充治疗后2年的牙齿进行拍片检查,根据根充长度是否恰填分组:恰填134颗,非恰填(欠填或超填)66颗,应用根尖周指数并综合临床检查,对其疗效进行评价。结果根管治疗成功率为68.8%;恰填根管的成功率(80.4%)比非恰填的成功率(45.8%)明显提高(P<0.01)。治疗后未行冠修复者易出现冠劈裂,不能保留而拔除者4颗,占4%。结论在进行根管治疗时,根充长度是否恰填明显影响治疗效果。     

不同根管器械用于预备弯曲根管的效果比较

目的比较机用镍钛K锉、手用镍钛K锉、手用不锈钢K锉,在预备弯曲根管时的切削能力和成形能力。方法将30个树脂块弯曲人工根管分为三组,每组10个,分别用镍钛机用K锉、手用镍钛K锉、手用不锈钢K锉预备根管,用光学显微镜观察根管的偏移情况及标本的失重量进行对比分析。结果镍钛机用K锉无根管偏移,手用不锈钢K锉可发生根管偏移。预备后的根尖孔直径镍钛K锉组明显小于不锈钢K锉组(P<001)。结论镍钛器械保持原根管解剖走向的能力优于手用不锈钢K锉。镍钛机用K锉能保持弯曲根管良好的根管形态,建议临床广泛应用。