3种暂封材料的边缘微渗漏

采用染料渗入法观察牙胶、氧化锌丁香油水门汀、磷酸锌水门汀与牙体组织间的边缘微渗漏。1　材料和方法新鲜的、表面完整的离体牙 30个 ,分为 3组 ,每组 10牙。 1组为牙胶 (上海齿科材料厂 ) ,2组为氧化锌丁香油水门汀 (鄂医大齿科材料厂 ) ,3组为磷酸锌水门汀 (上海齿科材料厂 )。将 30个离体牙进行髓腔预备 ,髓腔内置干棉球 ,分别用热牙胶、氧化锌丁香油水门汀、磷酸锌水门汀暂封。在暂封物 1ｍｍ以外用指甲油封闭 2次 ,干燥后 ,置于 0～ 4℃和 30～ 35℃水中循环 6 0次 ,每次 2ｍｉｎ。将实验牙倒置于甲紫溶液中 ,2 4ｈ后取出。用金刚砂…     

五种髓腔暂封材料冠方微渗漏的体外评价

目的:评价CIMAVIT(碧兰)、Coltosol(康特)、CavitG(3M)、IRM(登士柏)和氧化锌丁香油酚粘固剂(ZOE,北京)等5种髓腔暂封材料的冠方微渗漏。方法:选取近期拔除的磨牙及前磨牙42个,排除龋齿、隐裂及牙合面过度磨耗牙。开髓并制作髓腔直线通路,洞缘1mm以外牙面封闭。随机分为5组,每组8个牙,分别用上述5种材料充填髓腔入口至充满。2个牙做对照,髓腔不充填。材料固化后,将试验牙浸入2%亚甲兰染料中,经过4℃和56℃各2min共40次温度循环及室温下16h浸泡,纵剖牙齿,观察染料沿洞壁与充填体间隙渗入的深度并分析各材料组间的差异。结果:5种材料的冠方渗漏有显著性差异(P<0.01)。CIMAVIT和Coltosol染料渗漏最少,IRM产生最多的微渗漏。结论:CIMAVIT和Coltosol可获得较理想的髓腔封闭效果。     

3种暂封材料在根管治疗中冠方微渗漏的体外效果观察

目的观察3种暂封材料在根管治疗中冠方微渗漏的体外效果。方法选取近期拔除的完整前磨牙45颗,备洞开髓建立直线通路,随机分为3组,分别用氧化锌丁香油水门汀、牙胶条、Caviton亲水性暂封材充满窝洞,经封闭处理后浸入2%亚甲蓝溶液,1周后取出纵剖牙齿,测量染料渗入深度。结果牙胶条染料渗漏最多,氧化锌丁香油水门汀其次,Caviton亲水性暂封材渗漏最少。3种暂封材料冠方微渗漏差异有统计学意义(P<0.05)。结论 Caviton亲水性暂封材封闭效果优于氧化锌丁香油水门汀和牙胶条。     

4种暂封材料边缘微漏的比较

４种暂封材料边缘微漏的比较杨利明赵信义王云暂封材料主要用于髓室或根管内封药，应有良好的封闭性能［１］。１９９６年，我们研制了一种ＤＦ暂封材料，该材料为单组份糊剂，现测试了它的边缘微漏，以评价它们的边缘封闭性能。１材料和方法１．１材料所选４种暂封材料为...     

碘仿氢氧化钙糊剂注射根管充填的微渗漏实验研究

目的 :了解碘仿氢氧化钙糊剂 (iodoform -calciumhydroxideICH)注射根管充填对根尖孔的封闭性能。方法 :5 0颗离体单根牙随机分为实验组和对照组。两组分别用注射型ICH和氧化锌丁香油糊剂组单尖充填根管 ,采取染料渗入法检查根尖孔微渗漏 ,在解剖显微镜下测量染料渗入距离。结果 :ICH组微渗漏值平均 0 .60 2mm ,氧化锌丁香油糊剂组微渗漏值平均 1.2 3 6mm ,经t检验 ,P <0 .0 5 ,两组渗漏值具有显著性差异。结论 :注射型碘仿氢氧化钙糊剂对根尖孔的封闭性优于氧化锌丁香油糊剂     

3种暂封材料的临床应用比较

目的　探讨暂封材料在临床上的应用。方法　随机选取 131名患者 ,分别用氧化锌丁香油水门汀、牙胶、DM糊剂作为暂封材料 ,并观察其临床疗效。结果　氧化锌丁香油水门汀成功率为 93% ,牙胶的成功率为 89.5 % ,DM糊剂为 98%。经X2 检验 3组疗效差别显著 (P <0 .0 5 )。结论　DM糊剂为一种较理想的暂封材料 ,值得推广应用     

3种临床常用根管充填材料体外微渗漏实验研究

根管充填材料密封性能的好坏直接关系到根管治疗的疗效.本实验采用染色法对比3种根管充填材料对离体人牙根管的密封性,为临床选用根管充填材料提供一定的试验依据.     

暂封材料对窝洞充填后微渗漏影响的实验研究

目的：研究暂封材料对复合树脂充填后微渗漏的影响,探讨减少微渗漏的方法。方法：60颗离体牙备Ⅰ类洞后随机分为三组。A、B组为实验组,用氧化锌丁香油粘固剂暂封1周,超声波清洗去除暂封材料,A组再用气水枪冲洗、B组再用75%酒精擦拭及气水枪冲洗。然后用光固化树脂充填窝洞;C组为对照组,不暂封窝洞而直接进行光固化树脂充填。用染色法制备微渗漏检测标本,测量比较各组充填后的微渗漏情况。结果：A组微渗漏大于B组和C组（P〈0.05）,B组和C组间无统计学差异（P〉0.05）。结论：暂封材料残留有增加充填后微渗漏的可能性;超声波清洗后用75%酒精擦拭洞壁可以有效地减少微渗漏的发生及微渗漏程度。     

暂时封固对根管治疗牙冠方微渗漏影响的体外研究

目的 评价不同暂封材料、暂封方式对根管治疗牙冠方微渗漏的影响,探讨根管治疗牙冠方微渗漏发生情况及与时间的关系.方法 收集离体牙,常规根管治疗后随机分组,2%亚甲基蓝染色,制作透明样本,体视显微镜下观察样本微渗漏情况,根据染料渗漏最大长度评分,收集数据并进行统计分析.结果 暂封1、4 周时,Cavit-G和Caviton微渗漏评分低于氧化锌丁香酚水门汀(ZOE);暂封2 周,Caviton微渗漏评分低于ZOE和Cavit-G.ZOE作为暂封材料,两种方式样本微渗漏评分比较差异无统计学意义(P > 0.05);暂封1 周时,Cavit-G和Caviton直接与间接暂封微渗漏评分差异无统计学意义(P > 0.05),暂封2周,Cavit-G和Caviton微渗漏评分差异无统计学意义(P > 0.05).随暂封时间的延长,3种材料的微渗漏差异有统计学意义(P < 0.05).结论 Caviton冠方暂封效果最好,其次为Cavit-G,ZOE最差;间接暂封明显加速Cavit-G和Caviton暂封样本冠方微渗漏;Caviton和 Cavit-G用于暂封的适宜时间为2周,ZOE为1周.     

5种黏结剂的微渗漏实验研究

目的:比较 5种牙齿黏结剂减少复合树脂充填物边缘微渗漏情况。方法:在新近拔除的 30个人磨牙的颊、舌侧颈部分别制洞,将牙齿分为 6组,每组 5个牙, 10个窝洞。在 5组牙齿窝洞上分别应用U-Bond、SingeBondAdhesive、DurafillBond、GlumaOneBond和SuperBondC&B5种黏结剂,另一组作为空白对照(不用黏结剂),然后充填光固化复合树脂, 光照固化。所有牙齿进行冷热循环 600次,之后放入墨水蓝水溶液中浸泡 48h,颊舌向剖开牙齿,在体视显微镜下观察复合树脂充填物边缘的染料渗漏情况,结果作统计学处理。结果: 5种黏结剂中牙合壁和颈壁U-Bond微渗漏最小,其它 4种黏结剂之间无差异, 5种黏结剂与对照组有明显差异。结论: 5种黏结剂中U-Bond效果较好,GlumaOneBond、SingeBondAdhesive、DurafillBond、SuperBond等其余 4种材料次之,对照组最差。     

A laboratory study of coronal microleakage using four temporary restorative materials

AIM: The aim of this study was to compare the sealing abilities of Fermin and Canseal with the more popular temporary coronal filling materials, Cavit and Caviton. METHODOLOGY: Standardized access cavities were prepared in 160 intact human permanent molar teeth. They were divided into five groups consisting of 32 samples. The teeth were restored using one of the temporary filling materials, namely: Fermin, Canseal at two powder to liquid ratios, Caviton and Cavit. Thermal cycling and/or load cycling were applied on the samples. Assessment of microleakage utilized methylene blue dye penetration. Grading of the microleakage pattern was from 1 to 3, with 3 providing the best seal. Results were analyzed using two-way anova and by Fisher's PLSD post hoc test (P < 0.05). RESULT: Microleakage along Fermin, Caviton and Cavit samples did not go beyond Leakage Grade 2. Dye penetration into these materials was noted. This was not observed in the two groups of Canseal tested. However, the two groups of Canseal exhibited total leakage notably after being subjected to thermal cycling. There was a statistically significant difference in the microleakage scores obtained between the materials and conditions tested (P < 0.0001). CONCLUSION: Fermin was found to exhibit the best seal amongst the four materials tested followed by Caviton, and Cavit. Thermal cycling influenced the seal of certain types of temporary filling materials more than load cycling.     

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目的比较并评价3种不同暂封材料的冠部封闭效果。方法收集2011年1月至2012年5月于佛山市禅城区向阳医院因正畸或牙周病拔除的完整成人单根前磨牙60颗,备洞开髓后随机分为3组,每组20颗,分别用Clip、CavitG、氧化锌丁香油酚黏固剂（ZOE）3种暂封材料充满窝洞,经封闭处理后浸入2％亚甲蓝溶液染色,在暂封7d和14d时取出每组各10颗牙齿,顺牙长轴近远中向纵向剖开,观察染料渗入最大长度,并以此来评估3种暂封材料的冠部封闭效果。结果7d时Clip组和CavitG组封闭效果均优于ZOE组（P〈0．05）,14d时Clip组封闭效果优于其他两组（P〈0．05）。结论Clip是一种较好的根管治疗髓腔暂封材料。     

几种市售商品充填材料密合度的实验研究

选用几种市售牙体充填复合树脂和玻璃离子水门汀充填Ⅴ类洞(龈壁由牙骨质和牙本质组成),采用染色法观察其边缘微漏的离体牙实验。发现不同充填材料存在不同程度的边缘微漏,酸处理洞缘可显著降低边缘微漏(P<0.05),窝洞的牙釉质壁渗漏显著低于牙骨质壁渗漏(P<0.01)。实验结果提示,充填材料的粘附性能,窝洞边缘的位置以及酸处理技术,都将影响牙体充填的治疗效果。     

四种牙体修复材料体外充填微渗漏的实验研究

本研究用染液渗入法检测四种国产化学固化型修复材料分别与切／Ｈｅ壁及龈壁之间的微渗漏。结果表明：玻璃离子粘固粉，ＣＯ－１粘固粉的微渗漏量小，染液渗入限于洞侧壁，银汞合金边缘的染认渗入可达洞底，以上每种材料分别在切／Ｈｅ壁及龈壁的微渗漏没有差别。     

Bacterial penetration through temporary restorative materials in root-canal-treated teeth in vitro

Seventy extracted single-rooted mandibular premolars were used in this study to determine the length of time needed for bacteria present in natural human saliva to penetrate through three commonly used temporary restorative materials and through the entire root canal system obturated with the lateral condensation technique. Five intact teeth with no decay were used in the negative control group and five teeth with extensive decay in communication with the canal, in the positive control group. The 60 teeth used in the experimental group were divided into three groups. In Group 1, the access cavities of 20 teeth were temporarily restored with gutta percha, in Group 2 with IRM and in Group 3 with Cavit-G. All 70 teeth were mounted individually where the crown was placed in contact with human saliva. All five teeth in the positive control group caused broth turbidity within 24 h. In contrast, broth in the negative control group remained clear throughout the entire experimental period. In the experimental group, the average time for broth contamination of access cavities closed with gutta percha, IRM and Cavit-G was 7.85, 12.95 and 9.80 days, respectively. The Kruskal-Wallis nonparametric test showed significant differences among the groups, while the multiple comparison test showed that the IRM group was statistically better than the gutta percha group when the average lengths of time for contamination were compared ( P < 0.05).     

Fluoride release and uptake by four new fluoride releasing restorative materials

The present study compared the initial fluoride release and release following refluoridation of a conventional glass-ionomer Ketac-Molar (ESPE), a resin-modified glass-ionomer, Vitremer (3M), and two compomers F-2000 (3M) and Hytac (ESPE). Fifteen test specimens were prepared for each brand and immersed in deionized water. The fluoride released was measured every 2 days for 22 days. Refluoridation of the test specimens was done with solutions of 0.02, 0.04 and 0.2% NaF for 5 min on days 22, 30, 38 and 46. The fluoride released from recharged specimens was measured every 2 days until day 54. The fluoride release was highest during the first days after preparation, after which it decreased sharply and then more slowly. The four materials became 'recharged' with fluoride following repeated fluoride exposure in solution, the 0.2% solution being the most effective. From a clinical point of view, the results from this study imply that all the restorative materials tested may act as intra-oral devices for the controlled slow release of fluoride at sites at risk of recurrent caries. Fluoride release and uptake by four new fluoride releasing restorative materials.     

不同厚度材料封闭冠方根管的微渗漏对比研究

目的:对比研究根管口充填3mm或4mm厚度三种不同材料的冠方微渗漏。方法:选取140颗离体下颌前磨牙并在距离釉牙骨质界冠方2mm处截断牙冠。经根管清理、预备成型后随机分为6个实验组和1个对照组,每组20个样本。实验组的样本根管充填后根管冠方分别充填3mm或4mm厚玻璃离子体、Cavit暂封膏或氧化锌丁香油水门汀,对照组不作处理。用印度墨水对所有样本染色,透明处理后在体视显微镜下测量根管冠方染色长度,采用SPSS13.0软件进行统计分析。结果:不同材料及不同厚度的微渗漏间差异有统计学意义,P<0.05。不同材料的微渗漏由高到低排序为对照组>ZOE>Cavit>GI,组间两两比较差异有统计学意义,P<0.05。另外,4mm充填厚度微渗漏低于3mm充填厚度微渗漏,P<0.05。结论:玻璃离子体冠方封闭性能优于Cavit暂封膏,Cavit暂封膏封闭性能优于氧化锌丁香油水门汀。4mm厚度的充填材料比3 mm厚度的充填材料更有利于减少冠方微渗漏。     

Fluoride-containing restorative materials

Dental practitioners are exposed to an increasing number of dental materials, which claim the benefits of fluoride release. The purpose of this paper is to critically review the literature of these materials. Glass ionomers, resin modified glass ionomers, compomers, resin composites, fissure sealants and amalgam are discussed. It is clear that a long-term measurable release of fluoride can be observed from certain restorative materials, in vitro, particularly glass ionomer cement, resin modified glass ionomer cement, fluoridated cements, fluoridated dental amalgam and certain fissure sealants. In general, the rate of fluoride release is not constant but exhibits a relatively rapid initial rate, which decreases with time. However, the fluoride release profiles may be dependent on specific formulation and on experimental design and sampling methods. These materials may feature greater longevity, a reduced incidence of marginal failure, an elevated concentration of fluoride in contingent plaque, together with an antibacterial action when compared with non-fluoride releasing materials. In addition, fluoride-releasing materials may perform better in caries inhibition in artificial caries model studies than non-fluoridated materials. While any, or all, of these anti-cariogenic effects may be associated with fluoride release, a direct relationship between fluoride release profiles and such effects has not been determined in vivo.