牙体充填材料充填前后菌斑内细菌组成比较

目的 探讨充填材料对菌斑内细菌组成的影响。方法 比较复合树指、银汞合金、玻璃离子粘固粉充填前后一月内邻近菌斑细菌组成的变化情况及不同材料充填后菌斑细菌组成的差异。结果 复合树脂与银汞合金充填前后，总菌落数及变链菌、粘放菌的组成均无明显改变（Ｐ〉０．０５）。材料组间比较发现：玻璃离子粘固粉充填后的粘放菌、变链菌组成显著低于复合树指及银汞合金充填后（Ｐ〈０．０５）。结论 不同材料充填影响邻近菌斑内的细     

常用充填材料与牙体密合度的SEM观察研究

常用充填材料与牙体密合度的ＳＥＭ观察研究南京市口腔医院口腔内科胡幼芝江苏省肿瘤防治研究所口腔科吴一虹在牙体病的修复治疗中,充填材料与窝洞壁之间的密合度是牙体充填术成功与否的关键,也是评价充填材料性能优劣的重要指标之一。目前口腔科临床常用的充填材料与窝...     

乳牙牙体充填修复材料述评

乳牙牙体充填是去除龋蚀的病变组织，制备成一定的洞型，用牙科充填材料恢复牙体形态和正常生理功能，从而避免因龋引起并发病，维持牙列完整性，以保证乳牙正常替换及颌骨正常生长发育的有效方法。近年来，随着口腔材料学的发展，用于乳牙的充填材料种类日益增多，因此熟悉各类材料的性能特点、治疗方法及操作要领极为重要。     

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。     

几种牙体充填材料对牙体组织抗折性影响的实验研究

目的：本实验旨在评价牙体充填材料对牙体组织抗折性的影响。方法：将60颗离体前磨牙随机分为5组，备洞后，分别用银汞合金、银汞合金 粘接剂、LITE—FILⅡP、REACTMER四种充填材料充填，剩余一组为空白对照组。用电子万能试验机检测牙折裂负荷值，并对断裂面进行体式显微镜和扫描电镜观察。结果：牙折裂负荷值由小到大依次为银汞合金、空白对照、LITE—FILⅡP、银汞合金 粘接剂、REACTMER；扫描电镜显示，除银汞合金 粘接剂组的断裂面较复杂外，其他3组的断裂面均发生在充填材料与牙齿之间。结论：银汞合金 粘结剂、REACTMER和LITE—FILⅡP作为常用或新型的牙体充填材料，可增强余留牙体组织的抗折性。     

三类常用牙体充填材料界面微渗漏的激光扫描共聚焦显微镜观测

目的 观察银汞舍金、复合树脂和玻璃离子三类常用牙体充填材料在体外充填后的微渗漏情况.比较材料的边缘封闭性.方法 选取新鲜无龋前磨牙,备洞,充填材料,37℃水浴条件下0.1%罗丹明B荧光染料浸泡,激光扫描共聚焦显微镜测量荧光剂渗入深度,定量评价微渗漏程度.结果 三类材料与牙体界面均有不同程度的荧光染料渗入,渗漏程度由小到大依次为玻璃离子(23.63±3.06μm)、银汞合金(31.68±10.97μm)、复合树脂(32.86±11.67μm).玻璃离子与复合树脂相比有显著差异,在亚组中,使用玻璃离子预处理与银汞直接充填有显著差异,自酸蚀与全酸蚀粘结树脂也有显著统计学意义.其余各组比较无显著差异.结论 三类材料中玻璃离子与牙体界面的微渗漏最小;使用玻璃离子预处理后获得的边缘封闭性优于银汞直接充填;全酸蚀复合树脂与牙体的密合性较自酸蚀更佳.     

充填体边缘微渗漏的影响因素

窝洞修复后出现微渗漏可导致种种不良后果，增加修复后的失败率。本文就修复材料、玷污层、洞型设计、牙体硬组织结构、he力、牙体标本的制作及其他因素对充填体边缘微漏漏的影响作一综述，这有助于临床医师在此基础上提高充填质量。     

银粉玻璃离子和银汞合金牙体充填疗效的对比观察

目的 探讨银粉玻璃离子和银汞合金在牙体充填中的临床效果。方法 将５８２颗牙分别用争粉玻璃离子和银汞合金充填，并进行两年随诊观察。结果 银粉玻璃离子具有高抗压强度、较强粘结力和良好的边缘密合性（Ｐ〈０．０５），充填成功率为９５．８６％。结论临床效果优于银汞合金，可作为银汞合金的替代材料。     

根管倒充填材料生物相容性和边缘密合性的研究

本文应用6种材料在离体牙根作根管倒充填并做细胞附着实验,通过电镜摄片作材料密合度的测定和细胞附着情况的观察,以比较和筛选理想的倒充填材料。实验结果指出:玻璃离子体粘固粉具有良好的生物相容性和良好的边缘密合性。国产玻璃离子体粘固粉的性能与日本产的性能无大差别,可作为首选的根管倒充填材料。银汞合金密合性不仅比玻璃离子体粘固粉差,甚至不如磷酸锌粘固粉,生物相容性也不及玻璃离子体粘固粉。     

三种牙体充填材料边缘封闭性的实验研究

目的比较三种牙体充填材料体外充填后的边缘微渗漏程度。方法选择完整离体磨牙,清洁备洞后,充填不同牙科材料,模拟口腔温度进行贮存,采用染料渗透实验,用测量显微镜观测染料渗入牙齿的程度及电镜测量充填体边缘的缝隙宽度。结果三组充填物边缘均有染料渗入,程度不等,银汞合金胶囊>光固化充填树脂(非酸蚀型)>光固化充填树脂(酸蚀型)。充填物与牙体间的缝隙宽度平均值为:银汞合佥胶囊15.78±11.55微米;光固化充填树脂(非酸蚀型)12.09±9.13微米;光固化充填树脂(酸蚀型)9.61±4.13微米。结论充填物边缘密合性以光固化充填树脂(酸蚀型)为最佳。经统计分析,与其他二组充填材料相比有非常显著性差异。     

四种牙充填材料修复根分叉穿孔渗漏的比较

为临床选择有交的根分叉（髓室底）穿孔修复材料，采用２％次要液，作四种牙充填材料修复根分叉穿孔的渗漏测试。结果显示光固化玻璃离子渗漏最小，银汞合金次之；羟基磷灰石渗漏最大，染液充满髓腔，而应用羟基磷灰石与光因化玻璃离子夹层技术，能显著减少羟基磷灰石的渗漏。结论：羟基磷灰石与光固化玻璃离子夹层技术修复根分叉穿孔优于单独使用羟基磷灰石。     

Tooth discoloration induced by dental materials

Tooth discoloration after endodontic treatment is frequently attributed to drugs and filling materials. In this in vitro study the staining potential of various dental materials was investigated by means of a visual method to determine tooth color. Extracted human premolars were prepared, and the following materials were introduced into the pulp cavities: Cavit, Durelon, Dycal, Fletcher's cement, IRM, AH26-silver free, gutta-percha, Duo Percha, Fuji ionomer, and zinc phosphate cement. Before the materials were applied, the original tooth color was assessed on the external buccal tooth surfaces. Further color determinations were undertaken at regular intervals for 6 months after the materials were introduced. Durelon, Fuji ionomer, Fletcher's cement, and zinc phosphate cement did not induce measurable tooth discoloration. Cavit, Dycal, gutta-percha, and IRM caused a mild stain. For the teeth filled with AH26-silver free and Duo Percha, a moderate discoloration was recorded.     

根管治疗后下颌磨牙采用各种充填材料修复的三维有限元分析

目的：采用三维有限元方法分析比较下颌磨牙根管治疗后各种充填体和垫底材料对牙体应力分布的影响.方法：选用正常形态的下颌第一磨牙,基于Micro CT扫描建立根管治疗后I类洞型充填的三维有限元模型.在充填材料面施加200N咬合力的条件下,通过有限元方法分析用不同充填材料进行修复后的牙体组织应力分布状况.结果：银汞合金充填时牙体组织出现的最大拉应力和最大压应力分别是5.75MPa和14.97MPa,明显小于复合树脂充填时牙体组织出现的最大拉应力11.1lMPa和最大压应力26.01MPa.复合树脂充填时采用不同垫底材料,牙体组织出现的最大应力数值相近（最大拉应力11MPa＆#177;1％,最大压应力26MPa＆#177;1％）.结论：成功建立Ⅰ类洞型牙体缺失的下颌磨牙结构的三维有限元模型,实验数据表明,不同充填材料对牙体组织的应力影响较大,而不同垫底材料对牙体组织的应力无显著影响.     

Epidemiologic studies. I. Secondary caries in tooth areas restored by silver-tin-amalgam, silicate cement or inlays]

On the basis of epidemiologic studies on 10 106 sugjects from the population of the town of Rostock, the authors deal with the frequency of filled tooth areas and their affection by secondary caries with special regard to filling materials (silver-tin amalgam, silicate cement, inlay). The low frequency of secondary caries in tooth areas restored by means of inlays is noteworthy. Finally, the authors give recommendations for practice.     

A comparative study of fluoride-releasing adhesive resin materials

One of the most important and exciting properties of recently introduced dental restorative materials is their ability to release fluoride ions, as this has several advantageous effects on tooth structures. They have been extensively used as fluoride-releasing filling and luting materials. Recently, fluoride-releasing adhesive resins and fluoride-releasing adhesive resin cement have been developed and introduced for clinical use. The purpose of this study was to evaluate the fluoride release from these adhesive resins and the fluoride uptake by both enamel and dentin, as well as the acid-resistance of these tooth structures. Based on our results, we conclude that fluoride-releasing adhesive resins and luting cements are useful for the prevention of initial or secondary caries, especially along the margins of restorations.     

四种充填材料修复根面龋的微渗漏研究

目的比较四种充填材料修复根面龋的充填体边缘微渗漏情况。方法将制备洞型后的44颗离体牙随机分为4组,每组11个牙,备洞后分别采用复合体(3M F2000,简称Co组)、粘结银汞合金(黏结剂为3M Adper Prompt,简称Ad组)、银汞合金(杭州银亚新高铜球形银汞胶囊,简称Am组)和玻璃离子(3M Ketac,简称Ke组)材料充填,进行染料渗透试验。在Olympus GM型暗视野实体显微镜下观察并测量次甲基兰渗漏深入的部位,取根面龋离体牙20个,采用4种临床常用材料分别充填后在扫描电镜下观察充填材料和牙齿密合度并拍摄照片。结果使用复合体充填产生的微渗漏最小(0．03-0．76mm),其次为黏结银汞(0．44- 0．82mm)和银汞(0．89-1．59mm),玻璃离子产生的微渗漏最大(1．73-2．58mm)。结论复合体充填材料能够更好地预防继发龋和充填物脱落。     

Effects of the Nd:YAG laser, air-abrasion, and acid-etchant on filling materials

The purpose of this study was to determine any inadvertent effects of the neodymium: yttrium-aluminium-garnet (Nd:YAG) laser, air-abrasion, and ortho-phosphoric acid on some conventionally used dental filling materials [amalgam, composite resin, compomer, glass-ionomer cement (GIC), and ceromer], when they were used for purposes of margin etching and assessed according to standard enamel etching parameters using a total of five fillings. The surfaces of the filling materials were polished. One sample from each material group was exposed to laser (at 0.75 J, 15 pps) and air abrasion (with Al-oxide powder, 60 psi) for 2 s and to the 37% ortho-phosphoric acid for 60 s. The exposed materials were examined under Scanning Electron Microscopy (SEM). After laser treatment most specimens showed recrystallized areas, the GIC surface being the most affected. There were some pores and cavities on the amalgam surface following laser treatment. The abraded surfaces showed mechanical abrasions. The acid etchant showed the least effect. During the application of laser or air-abrasion, the adjacent tooth or filling surface must be protected or the dentist must be careful.     

The effect of zinc oxide-eugenol on the shear bond strength of a commonly used bonding system

It has been claimed that eugenol has a detrimental effect on resin composites and dentin bonding systems. The aim of the present study was to examine whether zinc oxide-eugenol (ZOE) cement would reduce the efficacy of a bonding system. Human third molars were selected for the study, and cylindrical posts of a resin composite (Z100) were bonded vertically to a standardized flat dentinal surface, prepared on the buccal surface of the teeth and treated with Scotchbond Multi-Purpose. The tooth surfaces involved were either freshly cut, or had been exposed to ZOE cement for 6 days, with and without a subsequent thorough cleansing with ethanol. The bond strength in shear was measured after 24 hours. The results showed that ZOE cement had no negative effect on the bond strength of the resin composite (Z100) to dentin when this bonding system was used. The mean shear bond value for the specimens covered with ZOE cement for 6 days was 28.1 MPa. For specimens covered with ZOE cement and cleansed with 96% ethanol, the mean shear bond value was 23.5 MPa. The corresponding value for the controls was 19.0 MPa. These findings suggested that eugenol-containing temporary filling materials may be used safely prior to inserting resin based restorative materials, when Scotchbond Multi-Purpose is employed as the bonding agent.     

The effect of zinc oxide-eugenol on the shear bond strength of a commonly used bonding system

Abstract – It has been claimed that eugenol has a detrimental effect on resin composites and dentin bonding systems. The aim of the present study was to examine whether zinc oxide-eugenol (ZOE) cement would reduce the efficacy of a bonding system. Human third molars were selected for the study, and cylindrical posts of a resin composite (Z100) were bonded vertically to a standardized flat dentinal surface, prepared on the buccal surface of the teeth and treated with Scotchbond Multi-Purpose. The tooth surfaces involved were either freshly cut, or had been exposed to ZOE cement for 6 days, with and without a subsequent thorough cleansing with ethanol. The bond strength in shear was measured after 24 hours. The results showed that ZOE cement had no negative effect on the bond strength of the resin composite (Z100) to dentin when this bonding system was used. The mean shear bond value for the specimens covered with ZOE cement for 6 days was 28.1 MPa. For specimens covered with ZOE cement and cleansed with 96% ethanol, the mean shear bond value was 23.5 MPa. The corresponding value for the controls was 19.0 MPa. These findings suggested that eugenol-containing temporary filling materials may be used safely prior to inserting resin based restorative materials, when Scotchbond Multi-Purpose is employed as the bonding agent.     

无髓牙修复应力分析初探

无髓牙修复是牙髓治疗与牙体修复二者的结合。丧失牙髓后牙体固有强度减弱.因此在无髓牙的修复中预防牙折具有特别重要的意义。本实验模拟无髓牙下颌第一磨牙(?)面Ⅰ类洞采用三维有限元法建立数值模型,利用SAP84(V4.2)程序计算并作了力学分析。结果显示:银汞合金或是复合树脂修复都以磷酸锌水门汀作基较合适,银汞合金修复时相对在银汞厚度大于基底厚度时应力最小,为最适宜的模型;而复合树脂修复时相对基底厚度大于树脂厚度为最佳。