核酸探针杂交技术用于检测伴放线放线杆菌

伴放线放线杆菌（Ａ．ｃ）是青少年牙周炎的主要致病菌，Ａ．ａ的传统检测方法费时费力。本文从酸分子杂交的原理出发，就核酸探针的种类及其杂交、探针的标记、临床应用、评价及使用酸探针杂交技术检测Ａ．ａ的前景做了介绍。     

放线共生放线杆菌的分型和基因鉴定方法

放线共生放线杆菌（Ａｃｔｉｎｏｂａｃｉｌｕｓａｃｔｉｎｏｍｙｃｅｔｅｍｃｏｍｉｔａｎｓ,Ａａ）是革兰氏阴性、兼性厌氧的球杆菌,它在牙周炎患者的牙周袋中检出率较高,有报告９０％‘以上青少年牙周炎的牙周损害部位有此菌定居［１］,因此,被认为是与牙周炎,...     

放线共生放线杆菌表面相关物质对成骨样细胞Mc3T3—E1？…

目的：观察放线共生放线杆菌表面相关物质对Ｍｃ３Ｔ３－Ｅ１细胞的ＤＮＡ合成和细胞周期的影响。方法：应用流式细胞仪技术。结果：１００μｇ／ｍｌ组明显抑制细胞ＤＮＡ合成，细胞增殖指数（Ｓ＋Ｇ２Ｍ）％降低（Ｐ〈０．０５）。结论：此物质不仅抑制细胞的分裂、增殖、而且还抑制细胞的ＤＮＡ合成。提示其在牙周病骨吸收过程中起着重要作用。     

龈沟液中I型胶原自身抗体的检测

本研究用间接ＥＬＩＳＡ法检测成人牙周炎（ＡＰ）２７例为４４牙，快速进展性牙周炎（ＲＰＰ）１０例２６牙及吉健康对照（Ｈ）１２例牙龈沟液中的Ｉ型胶原自身抗体（ＩｇＧ）。结果ＡＰ，ＲＰＰ及Ｈ各组的Ｉ型胶原抗体检出率分别为２７．３％，２６．９％和２２．２％，各组间的检出率无统计学差异（Ｐ〉０．０５），且Ｉ型胶原抗体水平与临床参数也无显著相关。本研究结果不支持牙周炎时机体对Ｉ型胶原产生了自身体液免疫反应，牙     

放线共生放线杆菌表面相关物质对成骨样细胞Mc3T3-E1的DNA合成及细胞周期的影响

目的：观察放线共生放线杆菌表面相关物质对Ｍｃ３Ｔ３－Ｅ１细胞的ＤＮＡ合成和细胞周期的影响。方法：应用流式细胞仪技术。结果：１００μｇ／ｍｌ组明显抑制细胞ＤＮＡ合成，细胞增殖指数（Ｓ＋Ｇ２Ｍ）％降低（Ｐ＜０．０５）。结论：此物质不仅抑制细胞的分裂、增殖，而且还抑制细胞的ＤＮＡ合成，提示其在牙周病骨吸收过程中起着重要作用     

放线共生放线杆菌表面相关物质对成纤维细胞L929的细胞毒性作用

目的：探讨放线共生放线杆菌表面相关物质对成纤维细胞Ｌ９２９的细胞毒性作用。方法：采用ＭＴＴ法、细胞计数法进行细胞毒性检测。结果：放线共生放线杆菌表面相关物质可明显抑制成纤维细胞Ｌ９２９的分裂、增殖，并呈明显的剂量依赖性，１００ｍｇ／Ｌ浓度组与对照组差别显著（Ｐ＜０．０５），但不致细胞死亡。结论：放线共生放线杆菌表面相关物质对Ｌ９２９细胞有明显的毒性作用，其致病机理不同于ＬＰＳ。     

伴放线放线杆菌诱导人外周血淋巴细胞活化及凋亡的体外研究

目的研究伴放线放线杆菌诱导人外周血淋巴细胞活化及凋亡的作用。方法选取10名全身及牙周组织健康受试者,分离外周血淋巴细胞,在有／无伴放线放线杆菌情况下培养0—96h,用荧光探针（AnnexinV—FITC、PI、CD69-TC7）进行标记,并进行流式细胞仪检测。结果全淋巴细胞加伴放线放线杆菌组AnnexinV＋／PI-细胞百分数在48h、72h、96h分别为13．42±2．88、22．74±2．18、46．92±4．28,全淋巴细胞组AnnexinV＋／PI-细胞百分数在48h、72h、96h分别为8．46±2．53、6．36±2．36、9．36±2．67,2组间存在明显差异（P〈0．01）。CD69加淋巴细胞加伴放线放线杆菌组和CD69＋淋巴细胞组AnnexinV＋／PI-细胞百分数除48h外的4个时间点上都无明显差异（P〉0．05）。CD69＋淋巴细胞加伴放线放线杆菌组AnnexinV＋／PI-细胞百分数在各个时间点上都明显高于全淋巴细胞加伴放线放线杆菌组（P〈0．01）。结论伴放线放线杆菌能够诱导人外周血淋巴细胞活化,并且能够通过活化促进其凋亡。     

牙周治疗前后血清抗体滴度及亲和性的变化

目的 观察牙周治疗前后抗牙龈卟啉菌（Ｐｇ）抗体滴度及亲和性的变化,探讨其在牙周炎致病机制中的作用。方法 采用ＥＬＩＳＡ法,检测１７例牙周炎患者治疗前及治疗后１个月及６名健康对照者的血清抗Ｐｇ３８１ＩｇＧ抗体滴度及亲和性。结果 牙周炎组治疗前抗体滴度高于对照组（Ｐ〈０．００１）,抗体滴度与探诊深度有负相关趋势,治疗后滴度显著降低（Ｐ〈０．０１）;亲和性与对照组间差异无显著性,治疗后也无显著性差异。     

儿童唾液成分与龋齿关系的分析

本实验对１０７名４－６岁乳牙儿童取混合唾液检测流速（Ｖ），唾液钙（Ｃａ），磷（Ｐ）唾液总蛋白（ＴＰ），及唾液免疫球蛋白ＩｇＧ，ＩｇＡ的含量进行分析，探讨其与龋齿的关系，结果显示：１，唾液的ＴＰ，ＩｇＧ，ＩｇＡ含量无龋组低于患龋线两组均数之间有显著性差异（Ｐ〈０．０５，Ｐ〈０．０１，Ｐ〈０．０１），２．唾液的Ｖ和Ｃａ，Ｐ含量，无龋组与患龋组两组均数之间无显著性差异（Ｐ〉０．０５），３无龋组快于唾液Ｖ     

Bass刷牙法去除菌斑的效果观察

作者对２０名受试者进行了习惯刷牙法与Ｂａｓｓ刷牙法效果的比较试验，分别记录了刷牙前、习惯刷牙后及Ｂａｓｓ法刷牙后６／４１│１４／６ ６个牙颊面的菌斑指数（ＰＬＩ），并进行单因素方差分析及两两比较。结果表明：刷牙前和习惯刷牙后的ＰＬＩ无显著性差异（Ｐ〉０．０５）；习惯刷牙后与Ｂａｓｓ法刷牙后的ＰＬＩ有显著性差异（Ｐ〈０．０５）．Ｂａｓｓ刷牙后与刷牙前的ＰＬＩ有极显著性差异（Ｐ〈０．０１），说明习惯刷     

Clinical experiences with patients with facial bone deformities associated with hemifacial microsomia.

Eighteen adult patients with hemifacial microsomia were treated with a combination of skeletal and augmentation surgery. Three typical cases are presented. In principle, skeletal and augmentation surgery have recently been performed in combination in a single stage. Groin flaps and scapular or scapular ostocutaneous flaps have mainly been employed for augmentation surgery.     

Vasovagal syncope with asystole associated with intravenous access

Two cases of vasovagal syncope (VVS) during venous access are reported. Both patients had a history of fainting episodes and experienced bradycardia with asystole, hypotension, and fainting. Pain and phobic stress during venous access triggered an increase in parasympathetic tone, resulting in bradycardia with asystole and hypotension in both cases. Hypotension and bradycardia likely caused cerebral hypoperfusion, leading to fainting. The intense parasympathetic tone triggered by somatic or emotional stress was likely responsible for directly depressing the sinus node, leading to asystole and bradycardia. Bradycardia with asystole progressing to syncope is a potentially fatal dysrhythmia in patients with cardiovascular disease or older patients with decreased cardiac function. Appropriate treatment for VVS includes the administration of intravenous fluids, vagolytics, ephedrine, and the rapid use of the Trendelenburg position. Intravenous fluids and atropine were used to treat the present patients.     

Inflammation associated with implants with different surface types

OBJECTIVES: The aim of this study was to determine the nature of the inflammatory infiltrate associated with different transmucosal implant surfaces in dogs. METHODS: Three experimental and one control single-stage implants were randomly placed on each side of the jaw in eight dogs. The transmucosal portion of the test implants consisted of an acid-etched surface (type A), a machined surface with a circumferential groove (type C) and a surface prepared by mild anodic oxidation (type D). The control was a standard machined surface (type B). In order to determine the response to the different surfaces, plaque control was carried out twice weekly following placement of the implants for the entire period of the experiment. At 6 months, gingival biopsies and plaque samples were obtained. The area of inflammatory infiltrate and the nature of the infiltrating cell types were determined using immunohistology. Real-time polymerase chain reaction was used to identify putative periodontal pathogens. RESULTS: Inflammatory infiltrates were associated with all implant surfaces and were commonly found subepithelially and perivascularly. T cells were the predominant infiltrating cell type in all lesions, associated with the different surfaces. In all lesions the CD4 : CD8 ratio was approximately 2 : 1. Statistical analysis showed that the type C surface (machined surface with a groove) had significantly larger inflammatory infiltrates than the type B surface (machined surface without a groove; P<0.05). No statistically significant differences were found with respect to the size of the inflammatory infiltrates or in terms of the nature of infiltrating cells. However, despite the intensive plaque control regime, plaque was present on all implant surfaces at the time of biopsy 6 months after placement. All implants had similar numbers of Tannerella forsythia, Fusobacterium nucleatum and Porphyromonas gingivalis. Actinobacillus actinomycetemcomitans, was not detected in any sample. CONCLUSIONS: These results suggest that the development of inflammation associated with implants is independent of surface type, but is nevertheless associated with the presence of plaque. The different surfaces had no influence on the nature of the infiltrate, with T cells being the predominant cell type in all lesions. Finally, the different implant surface types seemed not to influence the peri-implant microbiota. However, the presence of the circumferential groove tended to be associated with larger infiltrates. Whether this is due to increased plaque accumulation remains to be determined.     

Recurrent intraoral pyogenic granuloma with satellitosis treated with corticosteroids

The development of recurrent pyogenic granulomas as multiple satellite lesions has not been reported in the oral cavity. This report describes an unusual case of intraoral pyogenic granuloma recurring multiple times after surgical excisions with the formation of satellite lesions. Due to failure of surgical management, an alternative approach was taken. We illustrate how the lesions were successfully treated with a series of intralesional corticosteroid injections.