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1.
目的:研究载银纳米二氧化钛(Ag-TiO2)抗菌剂对藻酸盐印模材料抗菌性能的影响,分析其最佳添加比例。方法:常温下将载银纳米TiO2粉末按不同质量分数0~3.5%加入藻酸盐印模中,采用薄膜覆盖法检测藻酸盐印膜材料的抗菌性。结果:分析实验数据可知实验组与对照组比较差异均有统计学意义(均为P<0.05),并且随着Ag-TiO2抗菌剂添加质量比的增高,抗菌率明显增高 ,在抗菌剂质量分数达到2.0%时,藻酸盐印膜材料抗菌率达到99%以上,2.0%为其最佳添加比例。结论:添加Ag-TiO2抗菌剂对藻酸盐印模材料具有抗菌性,且2.0%为抗菌剂的最佳添加质量比。  相似文献   

2.
添加抗菌剂的藻酸盐印模材料抗菌性能的实验研究   总被引:5,自引:0,他引:5  
目的:对分别添加磷酸锆载银抗菌剂,醋酸洗必泰,三氯新3种抗菌成分的藻酸盐印模材料的抗菌性能进行测试,为口腔抗菌印模材料的研制奠定实验基础。方法:以1%的添加比将3种抗菌成分加入藻酸盐印模材料中,采用薄膜密着法,分别测试添加抗菌成分后印模材料对金黄色葡萄球菌,大肠杆菌的抗菌活性。结果:添加磷酸锆载银抗菌剂,醋酸洗必泰,三氯新的藻酸盐印模材料对金黄色葡萄球菌的抗菌率分别为99.85%,99.75%,99.91%;对大肠杆菌的抗菌率分别为99.83%,99.44%,99.89%。经检验,3种材料对两种菌株的抗菌率均无统计学差异(P〉0.05)。结论:以1%的比例添加3种抗菌成分的藻酸盐印模材料对金黄色葡萄球菌和大肠杆菌均具有良好的抗菌效果。采用薄膜密着法对藻酸盐印模材料进行抗菌性能的评价具有可行性。  相似文献   

3.
目的    探讨添加质量分数0.525% 的NaClO消毒液对琼脂-藻酸盐联合印模抗菌性能和物理性能的影响,为口腔抗菌印模材料的研制奠定实验基础。方法    本研究于2007年12月至2009年12月在南昌大学附属口腔医院进行。将质量分数0.525%的 NaClO消毒液加入到琼脂-藻酸盐联合印模材料中,采用玻板密闭法,测试添加消毒液后印模材料的抗菌活性,并参照相关标准对对结固时间,压应变等物理性能进行测试和评价。 结果    添加质量分数0.525%的NaClO消毒液的琼脂-藻酸盐联合印模材料,对金黄色葡萄球菌和大肠杆菌的抗菌率分别为99.83%和99.82%,对其本身的主要物理性能没有显著影响(P>0.05)。结论    质量分数0.525%的NaClO消毒液可赋予琼脂-藻酸盐联合印模材料强抗菌性能,但对其主要物理性能没有显著影响,可满足临床应用要求。  相似文献   

4.
目的 研究四针状氧化锌晶须(tetrapod-like zinc oxide whiskers,T-ZnOw)抗菌剂对复合树脂抗菌性能的影响,为减少树脂修复后继发龋提供新方法.方法 液体稀释法测试T-ZnOw和无机载银抗菌剂对变形链球菌的最小抑菌浓度(minimal inhibitory concentration,MIC)及最小杀菌浓度(minimal bactericidal concentration,MBC).复合树脂粉剂中分别加入质量分数为3%、5%、10%的T-ZnOw和质量分数分别为l%、3%、5%的无机载银抗菌剂,直接接触法测定抗菌率,比较树脂样本加速老化处理3个月后的抗菌率.结果 T-ZnOw和无机载银抗菌剂的MIC分别为0.15625、0.15625 g/L,MBC分别为0.3125、0.15625 g/L.T-ZnOw质量分数为3%、5%、10%时,树脂对变形链球菌的抗菌率分别为(84.85±5.16)%、(94.22±3.73)%、(99.43±0.48)%.无机载银抗菌剂质量分数为1%、3%、5%时,复合树脂的抗菌率分别为(71.01±7.67)%、(90.76±5.91)%、(97.19±4.10)%.老化后添加5%T-ZnOw和5%无机载银抗菌剂的树脂抗菌率分别为(89.89±5.55)%和(78.79±7.81)%.结论 添加T-ZnOw可赋予复合树脂抗菌性能,其质量分数达5%时即可取得较好的抗菌效果,且抗菌长效性优于无机载银抗菌剂.  相似文献   

5.
消毒剂对印模材料尺寸稳定性的影响   总被引:1,自引:3,他引:1  
目的 比较质量分数为 2 %戊二醛溶液与新型有机氯消毒剂———爱尔施消毒液浸泡两种藻酸盐和两种硅橡胶印模材料后 ,对材料尺寸稳定性的影响。方法 用 6 0mm× 10mm× 10mm金属试件制取印模 ,分别在质量分数为 2 %戊二醛溶液与爱尔施消毒液中浸泡 10、2 0、30min ,用JXD - 2 5 0B型数显读数显微镜测量浸泡前和浸泡后各时段印模材料的线性长度。每种印模材料分成 2组 ,每组 10个 ,用SPSS 10 .0统计软件包对结果作统计学分析。结果 爱尔施消毒液对各种印模材料尺寸稳定性的影响与质量分数为 2 %戊二醛溶液相比无显著性差异(P >0 .0 5 ) ;ImpregumF硅橡胶和ExpressPutty硅橡胶印模材料浸泡后的体积变化小于红叶和Cavex藻酸盐印模材料。结论 爱尔施消毒液不会影响印模材料的尺寸稳定性 ,可试用于临床印模的浸泡消毒 ;硅橡胶印模材料的尺寸稳定性优于藻酸盐印模材料  相似文献   

6.
目的:研究载银纳米二氧化钛(Ag-TiO2)抗菌剂对2种义齿软衬材料抗菌性能的影响,为临床应用提供理论基础。方法:常温下将载银纳米TiO2粉末按不同质量分数0~4%分别加入SOFRELINER MEDIUM软衬材料和自凝软衬垫中,采用薄膜覆盖法检测软衬材料的抗菌性及抗菌长效性。结果:分析实验数据可知实验组与对照组比较差异均有统计学意义(P<0.05),且随Ag-TiO2抗菌剂添加质量比增高,抗菌率明显增高。经过老化处理后的软衬材料,和处理前相比抗菌率变化很小,不具有显著差异。结论:添加Ag-TiO2抗菌剂的2种软衬材料均具有抗菌性,且抗菌率随着抗菌剂百分比的上升而显著提高;同时Ag-TiO2抗菌剂具有抗菌长效性。  相似文献   

7.
Liu J  Ge Y  Xu L 《华西口腔医学杂志》2012,30(2):201-205
目的采用体外法研究载银纳米二氧化钛(Ag-TiO2)树脂基托对口腔常见条件致病菌的单一游离菌体及菌斑生物膜的抗菌性能。方法将不同质量分数的Ag-TiO2抗菌粉剂添加到树脂基托材料中,制成抗菌树脂基托。采用薄膜密贴法分别检测该抗菌树脂基托对变异链球菌、白色假丝酵母菌、金黄色葡萄球菌的抗菌率,并用扫描电镜观察抗菌树脂基托表面变异链球菌、白色假丝酵母菌的生长情况。结果与未添加抗菌剂相比,抗菌剂质量分数为0.7%时,抗菌树脂基托对金黄色葡萄球菌的抗菌率达93.3%;抗菌剂质量分数为1.5%时,抗菌树脂基托对变异链球菌的抗菌率达90.2%;抗菌剂质量分数为2.5%时,抗菌树脂基托对白色假丝酵母菌的抗菌率也达91.2%。与未添加抗菌剂相比,抗菌树脂基托表面变异链球菌、白色假丝酵母菌的黏附数量明显减少。结论Ag-TiO2可以显著提高树脂基托的抗菌性能。  相似文献   

8.
藻酸盐印模材料流动性能的比较研究   总被引:5,自引:1,他引:4  
目的 研究藻酸盐印模材料流动性能随时间变化的特点.方法 利用直径20 mm、高20 mm的圆柱形模具,将藻酸盐印模材料调拌放入其中,在不同时间施加0.7 kg的负荷,测量其直径表示其流动性大小.结果 两种藻酸盐印模材料均在30 s时流动性最好,其后流动性逐渐下降,但红叶藻酸盐印模材料在150 s后流动停止,贺利氏藻酸盐印模材料则在180 s后无流动性;两种藻酸盐印模材料的流动性差别有显著性统计学意义(P<0.01);同一种印模材料在各时间段的流动性差别有显著性统计学意义(P<0.01).结论 藻酸盐印模材料的流动性随着时间的延长而逐渐减弱,30 s时为取模的最佳时间.  相似文献   

9.
添加抗菌剂的硅橡胶赝复材料体外抗白色念珠菌性能研究   总被引:7,自引:1,他引:6  
目的:研究加入银锌超细复合抗菌剂和纳米磷酸锆载银抗菌剂后硅橡胶赝复材料体外抗白色念珠菌黏附能力。方法:分别以0.5%、1%、1.5%、2%的重量比将抗菌剂加入硅橡胶赝复材料中,制成抗菌硅橡胶,用薄膜密着法测定抗菌硅橡胶对白色念珠菌的抗菌效果。结果:两种抗菌剂在0.5%重量比对白色念珠菌黏附与对照组无统计学差异,1%,1.5%,2%对白色念珠菌的抗菌性具有统计学意义。两种抗菌剂在添加量为0.5%,1%时无统计学差异,在1.5%和2%添加剂量时纳米磷酸锆载银抗菌剂抗白色念珠菌性能优于银锌超细复合抗菌剂。添加量为2%的纳米磷酸锆载银抗菌剂对白色念珠菌抗菌率〉80%。结论:两种抗菌剂在添加量〉1%时均有抗菌效能,在添加一定浓度时纳米磷酸锆载银抗菌剂的抗菌效能优于银锌超细复合抗菌剂。  相似文献   

10.
目的 研制一种新型可注射型藻酸盐印模材料,评价其准确性。 方法 将一定比例的海藻酸钠、磷酸三钠、氟钛酸钾、硅藻土等成分用水溶解,行星离心搅拌机混合均匀,获得一定黏度的基质组分;将一定比例半水硫酸钙、氧化镁、甘油、聚乙二醇(PEG)400离心搅拌机混合均匀,获得同样黏度的胶结剂组分。基质组分与胶结剂组分封装在2∶1体积比的A/B胶管内。使用时用与A/B胶管匹配的注射枪和混合头加压混合。样本分为3组:以注射型藻酸盐印模材料(IA组)作为实验组,Jeltrate藻酸盐印模材料(JA组)和Silagum-putty/light加成型硅橡胶印模材料(SI组)为对照。通过扫描电子显微镜(SEM)观察注射性藻酸盐印模材料的内部形貌,数字三维测量方法评价印模材料的准确性。 结果 SEM结果显示注射型藻酸盐印模材料比Jeltrate藻酸盐印模材料结构致密均匀,气泡含量较少。IA组、JA组、SI组模型与标准模型的差异性(正确度)分别为(49.58±1.453)、(54.75±7.264)、(30.92±1.013)μm。IA组、JA组、SI组内模型之间的差异性(精密度)分别为(85.79±8.191)、(97.65±11.060)、(56.51±4.995)μm。3组印模材料在正确度和精密度上差异有统计学意义(P<0.05)。 结论 新型可注射型的藻酸盐印模材料的准确性优于传统的粉剂型藻酸盐印模材料,但差于加成型硅橡胶印模材料。新型可注射性的藻酸盐印模材料具有良好的操作性能和印模准确性,显示出良好的应用前景。  相似文献   

11.
目的 合成兼具亲水及抗菌性的新型硅橡胶口腔印模材料,并探讨相关性能,为其在牙科领域中的进一步应用奠定基础。方法 在前期预实验的基础上确定了新型硅橡胶的基本配方,并以6%聚醚改性硅油作为润湿剂赋予其良好的亲水性。将自行合成的碘代长链烷基季铵盐修饰的纳米抗菌SiO2无机填料,按0%、1%、2%、3%、4%及5%的比例添加至亲水硅橡胶印模材料中,以期赋予其抗菌性,并以商品化的硅橡胶产品作为对照。测量各组硅橡胶材料的力学性能、润湿性、细节再现性、尺寸稳定性及调和时间;同时通过薄膜密着法与CCK-8法检测硅橡胶材料的抗菌性与细胞毒性;扫描电镜(SEM)观察新型硅橡胶的微观形貌。结果 当抗菌填料含量超过4%时,新型硅橡胶力学性能明显下降(P<0.05);与对照组相比,不同组别在不同时间节点接触角、细节再现性完好且线性尺寸变化率无显著变化(P>0.05);抗菌填料的加入不会对调和时间产生影响(P>0.05)。当加入4%抗菌填料时,抗菌率可达95.26%,展现出良好的抗菌性;所有组别细胞毒性反应差异无统计学意义(P>0.05),说明硅橡胶材料无明显细胞毒性。硅橡胶试样断面SEM...  相似文献   

12.
目的:比较无机抗菌剂对口腔致病菌的抗菌活性,并探讨不溶物质的优选测试方法。方法:采用试管液体稀释法和琼脂稀释法测试6种无机抗菌剂对6种口腔常见致病菌的抗菌活性。结果:试管液体稀释法测试结果显著低于琼脂稀释法。受试抗菌剂体外综合抗菌活性从高到低依次为:龙贝无机抗菌粉体、ZnOw AT-83、IONPURE-H、碱式次氯酸镁、ZnOw AT-88、安迪美-AMS2。结论:6种无机抗菌剂对实验菌株均有不同程度的抗菌活性。不溶性物质抗菌活性测试宜用液体稀释法。  相似文献   

13.
The aim of this study was to evaluate the antibacterial and antifungal properties of polyether impression materials using the agar diffusion test. Three different types of polyether impression materials (P2, Penta Soft and Penta) were tested to determine their ability to inhibit the growth of Enterococcus faecalis, Staphylococcus aureus, Pseudomonas aeruginosa, and Candida albicans. The areas of inhibition zones were measured visually with a 0.1-mm incremental Boley gauge. In all groups, none of the samples of the P2 polyether impression material exhibited antibacterial or antifungal activity against any of the microorganisms. All Penta Soft and Penta samples exhibited antibacterial activity against E. faecalis and S. aureus, and only Penta samples exhibited antifungal effect against C. albicans, which decreased progressively as the setting time of the material increased.  相似文献   

14.

Objective

Using computed tomography, scan impressions can be saved and edited as virtual data. The aim of this study was to evaluate the parameters influencing different impression materials and impression trays and their relevance with regard to accuracy and dimensional stability.

Materials and methods

Two alginate impressions (Zhermack Hydrogum?5 and Kaniedenta Tetrachrom?) and a polyether impression (3MEspe Impregum?) were each combined with two acrylic trays (3M Espe Position Tray? and Profimed Opti-Tray) and CT scanned immediately after impression at the Fraunhofer Institute Development Center for X-ray Technology (EZRT) in Fürth, Germany. Each impression was digitized 10 times on the same day, 3 times after 2 days and twice after 6 days, thus determining the dimensional stability of the various materials. An acrylic model was digitized with a high-resolution ??CT research scanner to be used as a reference for assessing the accuracy of the impression materials. For graphic and statistical analysis, VGStudio Max? was used.

Results

Both alginate impressions were less dimensionally stable than the polyether impression material. The Zhermack Hydrogum?5 alginate impression resulted in more deviation (151???m) after 6 days than the Kaniedenta Tetrachrom? impression. The polyether scans showed a mean deviation of 73???m. The accuracy of both alginates was similarly precise (mean value: Hydrogum?5 0.129 ± 0.021?mm, Tetrachrom? 0.137 ± 0.002?mm). The type of tray had limited influence on the results of the alginate impressions, while the accuracy of the Impregum? impression depended on the tray combination chosen.

Conclusion

The accuracy of the alginate impressions is sufficient for clinical use in orthodontics and produced, with correct storage, acceptable results even after 2 days. Hydrogum?5 impressions proved to be slightly more accurate than the reference material but less dimensionally stable than the Tetrachrom? impressions. The 3M Espe Position Tray? seemed to be more practical due to a better retentive effect compared to the Opti-Tray made by Profimed.  相似文献   

15.
目的通过向正畸牙釉质粘合树脂中添加锶强化生物活性玻璃,并对其抗菌性能及机械性能进行测试,寻求合适的添加比例,为正畸临床应用提供理论依据。方法分别将质量分数为1%、2%、3%、4%、5%的锶强化生物活性玻璃掺入到牙釉质粘合树脂中作为实验组,分别为1、2、3、4及5组,未掺入锶强化生物活性玻璃的牙釉质粘合树脂作为对照组,即0组。采用抑菌环法和贴膜法对以上各组进行抑菌活性测试;应用万能试验机对以上各组的剪切强度进行测试,观察并记录托槽脱落后牙面牙釉质粘合树脂残留指数(adhesive resin residual,ARI)。结果各实验组及对照组均未出现抑菌环,实验组4和5组的抗菌率达到99.9%,具有强抗细菌作用。实验各组的剪切强度与对照组相比,均有显著性差异(P<0.05)。实验各组之间比较,随掺入比例增加,剪切强度呈现降低趋势,但无统计学差异(P>0.05)。实验各组剪切强度均在临床可接受的剪切强度范围内,能够满足正畸临床要求。实验各组及对照组牙面均有牙釉质粘合树脂残留,ARI计分均在2~4分之间,各组间ARI计分比较无统计学差异(P>0.05)。结论掺入4%质量分数的锶强化生物活性玻璃的正畸牙釉质粘合树脂既表现出强抗菌作用,剪切强度又能够达到正畸临床需要,并对釉质表面粘合树脂的残留量无影响。  相似文献   

16.

Purpose

The purpose of this in-vitro study was to evaluate the effect of 0.5% glutaraldehyde spray disinfection on surface wettability of vinyl polysiloxane and polyether impression materials.

Methods and materials

Thirty-six specimens were prepared of vinyl polysiloxane-light (VPL), vinyl polysiloxane-regular (VPR) viscosity and polyether-monophase (PE) impression materials according to manufacturer’s recommendations. Specimens of each material were equally divided into control and experimental groups. All specimens were washed with water, dried and stored in closed containers. Specimens of experimental groups were sprayed with 0.5% glutaraldehyde disinfectant. The disinfectant was allowed to be in contact with the impression surface for 10?min. Contact angle was measured using a Contact Angle Goniometer at 0.5, 1 and 2?min after water drop contact with surfaces of impression materials. Five measurements at five different areas at each impression surface were recorded. A statistical analysis was done using Two-way repeated measures ANOVA and multiple comparison Tukey’s Post-hoc tests.

Results

All 0.5% glutaraldehyde-disinfected impression materials showed lower contact angle measurements than non-disinfected ones. Contact angle measurements of PE were much lower than those of VPL and VPR impression materials. However, there was a statistically significant difference of contact angle measurements between the three impression materials (p?=?0.000). Contact angle measurements of all groups significantly decreased as the time was increased (p?=?0.000).

Conclusion

Disinfection of the tested impression materials with 0.5% glutaraldehyde improved their wettability. Glutaraldehyde acted like a surface reducing agent (surfactant) that improved wetting potential of the impression materials.  相似文献   

17.
PURPOSE: Difficulties in sterilizing impressions have led to chemical disinfection solutions as an alternative; however, some impression materials are more sensitive to humidity. For example, polyether impression materials are more hydrophilic. This study investigated the effect of three disinfecting methods on the dimensional stability of three polyether impression materials. MATERIALS AND METHODS: Three polyether impression materials (P2, Impregum Penta Soft, and Impregum Penta) were submitted to the following treatments: spray disinfectant (Mikrozid Liquid), immersion in 2% glutaraldehyde solution (Super-On), immersion in 0.525% sodium hypochlorite solution for 10 minutes, and a control group (not disinfected). Each group included five samples. After treatment, dimensional change was evaluated according to ISO 4823. The data were analyzed by 2-way analysis of variance at alpha= 0.05. RESULTS: The mean percentages of linear dimensional change of materials P2, Penta Soft, and Penta were -0.040%, 0.098%, and 0.100%, respectively. The dimensional change associated with different disinfectant agents mikrozid liquid, 2% glutaraldehyde, room air (control), and 0.525% sodium hypochlorite was 0.013%, 0.024%, 0.077%, and 0.096%, respectively. The interaction between the impression materials and the disinfectant treatment was not significant. The disinfectant agents can be classified in two groups as low- and high-effected. The control group did not significantly differ from either group. CONCLUSION: From the standpoint of dimensional change, the disinfectants tested for 10 minutes caused no significant linear dimensional change in the polyether impression materials, compared with the control group.  相似文献   

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