100例老年人磨牙牙髓炎的治疗分析

目的:观察老年人磨牙牙髓炎的临床疗效。方法:将100例老年磨牙牙髓炎患者随机分为两组,各50例。A组,采用干髓术;B组去髓后根管治疗结合塑化治疗。术后3年、5年对比观察其疗效。结果:术后3年,两组疗效无显著性差异。术后5年,两组疗效有显著性差异。结论:干髓术或去髓后根管治疗结合塑化治疗都是治疗老年人牙髓炎的有效方法。     

Surgical treatment of a periradicular lesion on an invaginated maxillary lateral incisor (dens in dente)

The complex anatomy of invaginated teeth make their root canal treatment difficult. Moreover, this treatment may compromise the future of the tooth if it is destined to support a post-retained coronal restoration. This case reports the successful surgical root canal treatment of an invaginated tooth using a retrograde filling with gutta-percha. After surgical exposure of the root-end and cleaning of the root canal, the gutta-percha was compacted in the root canal which had been coated previously with a zinc oxide-eugenol cement. The gutta-percha was then cold-burnished. Periapical radiographic examination after 1, 2, 3, 6 and 12 months showed periapical healing with osseous formation. This procedure, resulting in minimal loss of hard tissues, permitted subsequent restoration of the tooth.     

Casting of TI-6AI-4V alloy compared with pure Ti in an Ar-arc casting machine

Dental protheses of Ti are normally cast in pure Ti. Some appliances, however, require higher yield strength. Casting of Ti alloys is of interest in such cases. The objective of the present work was to study the quality of castings made of Ti-6A–4V compared with those made of pure Ti. Casting was made into a mold kept at room temperature using a MgO-Al2O3 investment. A standardized five-unit bridge was cast, consisting of two cylindrical crowns with sharp margins and three pontics. The overall mold filling was satisfactory. The margins of the casting alloys were, however, more rugged and incomplete than those of pure Ti. The most likely reason for this difference is the increased formation of dendrites in the alloy and thus more resistance to fluid flow. Furthermore, the sprue of the alloy was also found to contain some spherical, internal pores. Such pores were rare in the pure Ti castings. The surface reactions were found to be minimal for both of the materials. Increased casting deficiencies observed in the cast bridges of the Ti-6AI-4V alloy, compared with pure Ti, were: 1) the margins of the crowns in the bridge were less complete and 2) there was a tendency to an increased internal porosity, particularly in the sprues.     

The effect of isolated ultrafiltration on Doppler-derived indices of left ventricular diastolic function

Background. Haemodialysis (HD) is associated with acute changessimultaneously in fluid status (ultrafiltration) and in manybiochemical parameters (dialysis). Reports on the effects ofthese changes on left ventricular (LV) diastolic function arescant. This study evaluated the effect of isolated ultrafiltration(UF) and subsequent HD with minimal fluid removal on Doppler-derivedindices of LV diastolic function in patients who were asymptomaticand stable on HD. Methods. In 11 HD cases, the 5 h treatment session was dividedinto a 2.5 h period of fluid removal without dialysis (UF phase)and 2.5 h of dialysis with minimal fluid removal (HD phase).We examined the following parameters of LV diastolic functionechocardiographically: early rapid filling (Emax), atrial peakfilling (Amax), Emax/Amax ratio, isovolumic relaxation time(IVRT) and deceleration time of the E-wave (DT). Results. During the UF phase, Emax decreased from 0.82±0.2to 0.62±0.2 m/s (P = 0.003), Amax decreased from 0.72±0.2to 0.63±0.2 m/s (P = 0.042) and the ratio Emax/Amax didnot change (P = NS). During the HD phase, Emax increased from0.62±0.2 to 0.72±0.2 m/s (P = 0.018), Amax increasedfrom 0.63±0.2 to 0.70±0.3 m/s (P = NS) and theEmax/Amax ratio remained unchanged (P = NS). IVRT was prolongedin 10 out of 11 patients at the start of the UF phase and itwas further prolonged from 142±40 to 171±55 ms(P = 0.03) during the UF phase. IVRT did not alter during theHD phase (P = NS). During the UF phase, DT increased from 175±83to 244±119 and it decreased from 244±119 to 209±98in the HD phase, but both changes were statistically insignificant.No statistically significant correlations were observed betweenthe changes in the Doppler indices of diastolic function andchanges in biochemical parameters during the HD phase. Conclusions. UF affects the parameters Emax, Amax and IVRT usedto evaluate LV diastolic function. The changes in Emax and Amaxduring the HD phase are due to fluid refilling from tissuesinto the blood space, HD as such having no effect on Dopplerindices. However, isolated UF or HD does not affect the Emax/Amaxratio. Emax and IVRT seem to be the most volume-sensitive parameters.     

A simple model for evaluating relative toxicity of root filling materials in cultures of human oral fibroblasts

Abstract Standardized test tubes filled with freshly mixed root filling materials (AH26, CRCS, N2, Kloroperka NØ, ZOE cement and 2 experimental cements, ECI and ECII) were transferred into tissue culture flasks. Normal human oral fibroblasts were seeded in the flasks. Morphological cell changes were studied up to 15 days after seeding. The size of cell-free zones around the test tubes and the total cell number per culture flask were calculated after 5, 10 and 15 days. The findings showed N2 cement to be by far the most toxic material at all observation periods, whereas no toxic reactions could be seen in relation to tubes filled with Kloroperka NØ. Compared with the 5-clay observation period, some cell recovery was observed around test tubes with AH26 and ECII, whereas almost full cell recovery was found around test tubes with CRCS, ZOE and ECI. It was concluded that the present model, which allows long-term observations of human cellular reactions to dental materials, can be used as a simple and relatively cheap screening test for initial toxicity testing of dental materials.     

快速膀胱充盈剂的临床研究

采用猪苓、茯苓、速尿研制成快速膀胱充盈剂,用B超观察了211例受试者膀胱尿量及达到最佳充盈时间。结果表明,在单位时间内,实验组尿量最多,充盈时间最短为30.35±7.9min(x±S,下同),西药组为63.8±31.9min,中药组为85.4±44.3min,白开水组为145.6±50.1min。经临床1180例应用证明,该方剂能显著提高B超探查质量和工作效率,缩短患者候检时间,解除老年人及前列腺肥大者的憋尿痛苦,起效时间短,持续时间短,无副作用。     

心尖搏动图和多普勒超声心动图评价老年冠心病的左室舒张功能

采用心尖搏动图(ACG)和多普勒超声心动图检查50例老年冠心病患者的左室功能,并与32的健康老年人比较。结果冠心病患者均有程度不同的舒张功能异常。主要表现为多普勒二尖瓣口舒张早期峰值速度(E)降低、舒张晚期峰值速度(A)增加,A/E比值增大;ACG的A波及心房音S_4振幅增大。两种方法检测结果相关性较好。     

左室内舒张期血流传播速度评价房颤患者左室舒张功能

目的:探讨彩色多普勒超声心动图诊断房颤患者左室舒张功能障碍的价值.材料和方法:心脏病患者24例(孤立性房颤8例,高血压性心脏病合并房颤7例,扩张性心肌病合并房颤9例),对照组30例.取心尖四腔观,将多普勒取样容积置于二尖瓣口以及距二尖瓣口1、2、3cm处,测量二尖瓣血流E峰流速,计算舒张早期血流播散的速度.结果:对照组左室舒张早期血流速度保持不变.各种心脏病患者左室舒张早期血流速度随传播距离加大而递减.结论:左室舒张早期血流的传播速度,是评价房颤及二尖瓣血流频谱假性正常化者左室舒张功能障碍的方法.     

Allergenic potential of root canal sealers

Abstract The sensitizing potential of 4 root canal sealers, Endo-methasone, ProcoSol, AH26, and Kloroperka N-Ø, was evaluated in a modified guinea pig maximization test. All 4 materials induced sensitivity. When single components of the sealers were used in subsequent skin challenges of the same animals, positive responses were elicited by eugenol and thymol iodide in Endométhasone, eugenol in ProcoSol, epoxy resin in AH26, and chloroform in Kloroperka N-Ø. As reports on hypersensitivity reactions after endodontic treatment are rare, the demonstrated capability of the sealers to induce a delayed hypersensitivity reaction may seem to be of minor clinical significance. However, a possible allergic reaction should be considered in endodontic patients with complicated postoperative symptoms. Furthermore, the potential for the sealers to cause dermatological problems to the professionals handling them should not be overlooked.     

健康成人肥胖程度对左室充盈的影响

对１２９例正常健康成人肥胖程度对左室舒张功能的影响及特点进行研究。以多普勒超声心动检测的左室舒张功能指标为应变量，以可能对其有影响的生理因素为自变量，进行多元逐步回归，筛选出对其有显著相关关系的独立影响因素。