口腔贱金属合金修复体的生物相容性试验

贱金属合金烤瓷熔附金属修复体是口腔临床修复体应用的主体,存在着较高的不安全性,其生物相容性评价主要有细胞毒性试验、动物试验和临床前试验.细胞毒性检测主要有中性红试验、51Cr释放法、分子滤过试验、甲噻唑四唑氮比色试验、细胞计数试剂盒8试验、乳酸脱氢酶试验、红细胞溶血试验和流式细胞计数等,使用最广泛的细胞是L929细胞和海拉细胞.按细胞接触方式的不同,毒性试验细胞的培养分为浸提液培养法、直接接触法和间接接触法.动物试验可从整体上评价生物相容性,可产生免疫或补体激活反应,但试验难以控制,费用高,费时.动物试验可弥补细胞毒性试验难以模拟的综合反应,因此其与细胞毒性试验一样都是口腔材料生物相容性评价必不可少的环节.     

高脂血症性胰腺炎20年发病率和临床特征的分析

目的 回顾性分析近20年广州市第一人民医院收治的高三酰甘油血症性急性胰腺炎（HLAP）的发病率及其临床特征变化.方法 收集1991年1月至2010年12月广州医科大学附属广州市第一人民医院急性胰腺炎（AP）病例1 362例,根据时间划分为4个年度段（1991年至1995年,1996年至2000年,2001年至2005年,2006年至2010年）,比较HLAP患者的发病构成、临床特征和预后.结果 HLAP患者共99例,其中男性61例,女性38例,平均年龄（44±12）岁,以年轻男性居多.HLAP患者占总AP患者的7.3％,4个年度构成比分别为5.4％、5.7％、6.7％和8.3％,20年间增加了1.5倍.99例HLAP患者平均血淀粉酶活性为（513.3±462.7） mmol/L,TG为（12.7±7.0） mmol/L,Ranson评分为（1.2±1.1）分,CT严重指数（CTSI）为（2.2±1.1）分,全身炎症反应综合征（SIRS）发生率为36.4％,脏器功能衰竭发生率为18.2％,胰腺假性囊肿发生率5.1％,但重度急性胰腺炎（SAP）发生率和病死率并不随年代变迁而变化.HLAP患者SAP发生率和病死率均显著高于胆源性AP（分别为20.2％比8.5％,6.1％比2.8％）.血液净化应用率从第1年度段的0上升到第4年度段的10.7％.HLAP患者的住院时间从第1年度段的26 d逐渐下降至第4年度段的14 d,差异具有统计学意义（P＜0.05）.结论 HLAP发生率呈逐年升高趋势,有重症化倾向,但患者预后有所改善.     

Gonococcal endocarditis: a case report and literature review

Gonococcal endocarditis is rarely encountered in the post-antibiotic era. This case report describes a case of a previously healthy male who presented with double quotidian fever, chills, cough, and urethral symptoms. The presence of a cardiac mitral valvular vegetation along with positive blood cultures for Neisseria gonorrhoeae were diagnostic for gonococcal endocarditis. This case was, to our knowledge, the first reported gonococcal endocarditis case in China.     

A micro-computed tomography study of the root canal morphology of the mandibular first premolar in a population from southwestern China

Objectives

This study aimed to investigate the root canal morphology of mandibular first premolar teeth in a population from southwestern China by micro-computed tomography (micro-CT).

Materials and methods

Human mandibular first premolars (115) were selected and prepared for micro-CT analysis with a slice thickness of 30 μm. Details of root canal orifices, canals, accessory canals, apical foramina–apical delta intercanal communication, loops and isthmuses, and mesial invagination were analyzed from reconstructed three-dimensional (3D) images.

Results

Canal patterns categorized according to the classification defined by Vertucci (Endod Top 10:3–29, 2005) as types I (65.2 %), III (2.6 %), V (22.6 %), and VII were identified (0.9 %). Accessory canals were present in 35.7 % of the samples and were predominantly located in the apical third of the root. A single apical foramen was observed in 50.4 % of the samples and two or three foramina in 28.7 % and 14.8 %, respectively. Apical delta was identified in 6.1 % of the samples and the prevalence of intercanal communication and loops was 3.5 % and 7 %, respectively. Mesial invagination of the root was identified in 27.8 % of the samples, the majority of which contained multiple canals.

Conclusions

The data obtained in this study revealed complex root morphology with high prevalence of multiple canals, more than half of which exhibited type I canal patterns.

Clinical relevance

Micro-CT was used as a noninvasive technique for 3D investigation of root canal morphology in the mandibular first premolars of a population from southwestern China. Furthermore, data obtained revealed complex anatomy of various types.