Beta角评价前牙反患者颌骨矢状关系的准确性分析

目的探讨Beta角判断替牙期与恒牙期前牙反[牙合]患者颅面矢状关系的可靠程度。方法应用X线头颅定位侧位片,比较替牙期与恒牙期前牙反[牙合]患者的Beta角、ANB角、Wits值和APDI指数的差异,并进行相关性和变异程度分析。结果替牙期与恒牙期前牙反[牙合]患者Beta角间差异有统计学意义（P〈0．05）;Beta角与ANB角、Wits值和APDI指数显著相关（P〈0．05）,但变异较ANB角和Wits值小,与APDI指数接近。结论Beta角可准确评价前牙反[牙合]患者的颌骨矢状关系。     

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目的探讨数字根尖片在术前评估根管内折断器械取出难度和根管侧穿发生中的应用价值。方法应用分角投照技术拍摄的患牙数字根尖片,对2007年4月至2008年10月于烟台市口腔医院特需门诊就诊接受显微超声取根管内折断器械的病例47例进行分析,分析其折断器械在根管内的位置与折断器械取出成功率和根管侧穿发生率的关系。结果当折断器械位于根尖1/3时,应用显微超声技术取出的成功率和根管侧穿发生率分别为36.84%和52.63%,而器械位于根管冠1/3、中1/3时取出成功率分别为90.00%、88.89%,根管侧穿发生率分别为10.00%、11.11%;当折断器械位于弯曲根管以上或以下时器械取出的成功率分别为88.46%和42.86%,根管侧穿的发生率分别为11.54%和47.62%。结论分角投照数字根尖片在术前分析根管内折断器械取出的成功率和根管侧穿的发生具有较高的参考价值,可作为根管内折断器械病例术前难度评估和预测侧穿发生的常规方法。     

Wettability of denture relining materials under water storage over time

STATEMENT OF PROBLEM

Poor wettability of denture relining materials may lead to retention problems and patient discomfort.

PURPOSE

Purpose of this study is to compare and evaluate wettability of nine denture relining materials using contact angle measurements under air and water storage over time.

MATERIAL AND METHODS

Nine denture relining materials were investigated in this study. Two heat-curing polymethyl-methacrylate (PMMA) denture base materials: Vertex RS, Lang, one self-curing polyethyl-methacrylate (PEMA) chairside reline resin: Rebase II, six silicone relining materials: Mucopren soft, Mucosoft, Mollosil® plus, Sofreliner Touch, GC Reline™ Ultrasoft, Silagum automix comfort were used in this experiment. Contact angles were measured using high-resolution drop shape analysis system (DSA 10-MK2, KRUESS, Germany) under three conditions (in air after setting, 1 hour water storage, and 24 hours water storage). Nine materials were classified into three groups according to material composition (Group 1: PMMA, Group 2: PEMA, Group 3: Silicone). Mean values of contact angles were compared using independent samples t-test and one-way ANOVA, followed by a Scheffe''s post hoc analysis (α= 0.01).

RESULTS

Contact angles of materials tested after air and water storage increased in the following order: Group 1 (PMMA), Group 2 (PEMA), Group 3 (Silicone). Heat-cured acrylic denture base resins had more wettability than silicone relining materials. Lang had the highest wettability after 24 hours of water storage. Silicone relining materials had lower wettability due to their hydrophobicity. Wettability of all denture relining materials, except Rebase II and Mollosil® plus, increased after 24 hours of water storage.

CONCLUSIONS

Conventional heat-cured resin showed the highest wettability, therefore, it can be suggested that heat-cured acrylic resin is material of choice for denture relining materials.     

The impact of joint angle and movement velocity on sex differences in the functional hamstring/quadriceps ratio

Background

Females are two to eight times more likely to suffer a non-contact injury compared with males thus the purpose of this study was to explore the influence of joint angle and movement velocity on sex differences in the functional hamstring to quadriceps ratio (H/Q_FUNC).

Influence of Biodegradable Release Oils on the Physical and Mechanical Properties of Light-Colored Architectural Concrete

In the article, unique formulations of biodegradable, non-toxic, edible oil-based release oils were developed and tested on architectural concrete. The produced agents have physicochemical properties similar to diesel fuel, but at the same time, are renewable and biodegradable products. An ultrasound was used to properly combine the liquid phase of edible oil and the liquid phase of glyceryl trioleate and/or water. Based on the PN-B-19305 standard, seven-component configurations were designed and then tested. The wettability of the concrete was determined by contact angle (CA) analysis. After the application of the formulations produced, the architectural concrete still had good wettability. The vapor permeability test showed that the tested release agents did not inhibit water vapor diffusion from the tested samples. The O65G35 (65% unique edible oil formula and 35% glyceryl trioleate) concrete had the best absorption. In this case, the CA was 56° after oil application and 46° before. The new agents did not impair the adhesion of the plaster to concrete. The O90W10 concrete showed the best adhesion of plasters made with it—51.9 kN/m². The study also showed that the concrete surface had excellent paint absorption despite the use of release agents. The architectural concrete was evenly covered with paint without any problem. There were no difficulties in applying it, e.g., greasy places preventing the concrete from being coated with emulsion. The suitability of the produced release oils for lightweight architectural concrete structures intended for facades was confirmed. The best results were obtained after using formulations O65T35 and O90W10.     

低位直肠癌超低位吻合保肛术48例疗效评价

目的　评价低位直肠癌超低位吻合保肛术的安全性及临床价值。　方法　回顾性分析 4 8例低位直肠癌 ,行根治性全直肠切除后 ,重建直肠瓣、直肠角 ,用常规缝合法作乙状结肠与肛管齿状线或直肠最低位吻合。　结果　全组无手术死亡病例 ,术后出现吻合口狭窄 1例 ,肛周粪渍性湿疹 18例 (18/ 4 8) ,无其它并发症。术后 6个月肛门功能全部优良。局部复发率 6 2 5 % (3/ 4 8)。　结论　只要严格掌握适应证 ,超低位直肠癌保肛术是一种安全有效的方法 ,值得在临床上进一步研究和推广     

Using drug-excipient interactions for siRNA delivery

SiRNA is the trigger of RNA interference, a mechanism discovered in the late 1990s. To release the therapeutic potential of this versatile but large and fragile molecule, excipients are used which either interact by electrostatic interaction, passively encapsulate siRNA or are covalently attached to enable specific and safe delivery of the drug substance. Controlling the delicate balance between protective complexation and release of siRNA at the right point and time is done by understanding excipients-siRNA interactions. These can be lipids, polymers such as PEI, PLGA, Chitosans, Cyclodextrins, as well as aptamers and peptides. This review describes the mechanisms of interaction of the most commonly used siRNA delivery vehicles, and looks at the results of their clinical and preclinical studies.     

Hangman骨折19例手术治疗效果分析

目的 探讨Hangman骨折的治疗方法及疗效.方法 我院2005年1月～2010年12月分别采用前路手术内固定和后路手术内固定治疗Hangman骨折19例.结果 19例均获随访,随访时间6个月～3年,采用美国脊椎损伤协会(ASIA)评分标准分级评定神经功能恢复情况,术前有神经功能障碍者均恢复到E级,术后X线检查示椎间高...     

零角度整脊术治疗腰椎间盘突出症的临床运用

[目的]临床观察零角度整脊术治疗腰椎间盘突出症的疗效。[方法]通过胸椎、腰椎、骶椎零角度整脊术辨证施治治疗腰椎间盘突出症570例。[结果]L4/L5突出总有效率为99%;L5/S1突出总有效率98%;L4/5+L5/S1突出总有效率为98%;L4/5合并椎管狭窄总有效率为96%;L5/S1合并椎管狭窄总有效率为96%。[结论]零角度整脊术是保守治疗腰椎间盘突出症有效方法之一。     

Age‐Associated Changes of the Mandibular Foramen Position in Anteroposterior Dimension and of the Mandibular Angle in Dry Human Mandibles

The effect of age on the anteroposterior (A‐P) position of the mandibular foramen (MF) and on the size of the gonial angle (GA) was evaluated in this study. From an Israeli Bedouin population, 121 dry mandibles with primary (36), mixed (26), and permanent dentitions (59) were analyzed. The A‐P position of the MF perpendicular to the posterior border of the ramus was measured with a digital caliper. A mandibulometer was used to evaluate the GA. The MF distance from the posterior border of the ramus increased significantly with age by 66% from primary (7.75 mm) to permanent (12.9 mm; P < 0.001). Similarly, the MF distance from the posterior border of the ramus relative to the total ramus width in A‐P dimension increased significantly (21.4%) with altered dentitions from primary (0.28) to late permanent dentition (0.34; P < 0.001). The GA decreased significantly with age from 140.17° ± 5.9° (primary dentition) to 123.61° ± 6.9° (late permanent dentition; P < 0.001). The anterior movement of the MF and the decreased size of the GA that occurred with changing dentition were related to growth process. The MF moves anteriorly, and the GA decreases with age. Anat Rec, 2011. © 2011 Wiley‐Liss, Inc.