扫描电镜和放射性^131I标记物对乳牙充填材料边缘微漏的实验研究

乳牙充填体与牙体洞壁间的密合是修复成功的关键，也是评价充填材料优劣的重要指标之一，充填体与牙体组织间的微渗漏（Marginal microleakage，ML）可造成口内液体和细菌侵入，产生继发龋及牙髓病变；还可引起充填体折裂、脱落、牙变色及充填后牙齿高度敏感等。虽然充填材料及技术在不断的进步，目前尚无法达到充填后完全封闭充填体与牙体组织间缝隙的程度。     

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。     

BISCO复合材料与银汞合金的粘结——扫描电镜观察

目的为了观察BISCO复合材料处理窝洞壁对银汞合金充填体边缘密合性的影响方法采用健康人下颌智齿按一定要求制成牙本质洞实验组BISCO复合材料处理洞壁后在其未凝固之前立即充填银汞合金对照组洞壁未作特殊处理直接银充扫描电镜SEM观察充填体-BISCO复合材料-牙体界面形态并测量充填体边缘缝隙宽度结果实验组充填体边缘缝隙宽度明显小于对照组p<0.01结论BISCO复合材料与银汞合金间结合紧密可以改善充填体边缘密合性。     

口腔临床充填材料边缘微渗漏的实验研究

目的 :比较各种牙科充填材料体外充填后的边缘微渗漏现象 ,筛选出密合度良好的充填材料。方法 :选择健康离体后牙 ,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 :3组充填物边缘均有染料渗入 ,程度不等。银汞合金胶囊 相似文献   

扫描电镜和放射性131Ⅰ标记物对乳牙充填材料边缘微漏的实验研究

乳牙充填体与牙体洞壁间的密合是修复成功的关键,也是评价充填材料优劣的重要指标之一,充填体与牙体组织间的微渗漏(Marginal microleakage,ML)可造成口内液体和细菌侵入,产生继发龋及牙髓病变;还可引起充填体折裂、脱落、牙变色及充填后牙齿高度敏感等[1,2]。虽然充填材料及技术在不断的进步,目前尚无法达到充填后完全封闭充填体与牙体组织间缝隙的程度[3,4]。国外有学者[6]对乳牙充填体的边缘微漏进行了研究。本研究采用逆向放射活性吸收法(reverse radioactive absorption method,RRAM)及扫描电镜(scanning electron microscope,SEM)…     

玻璃离子衬垫对银汞充填后微渗漏的影响

玻璃离子衬垫对银汞充填后微渗漏的影响山东省滨州医学院附属医院（２５６６０３）王青山舒静媛赵波崔秀英银汞合金具有优良的抗压抗磨性能，是目前后牙缺损充填中应用最多的材料，但它与洞壁之间的密合性较差［１］。本研究采用离体牙在洞壁上垫衬一薄层玻璃离子（ＧＩＣ...     

几种常用及新型充填材料密合度的实验研究

在牙体缺损的修复治疗中 ,充填材料与牙齿洞壁的密合度是充填成功的关键。微漏的存在往往是临床中引起继发龋或充填物松动脱落的主要原因。本文对几种传统及新型的充填材料在离体牙上充填后的密合度进行观察 ,为牙合面及颈部楔状缺损充填时选择合适的充填材料提供依据。1　材料与方法1.1　材料　高铜球形银汞合金 (冶金部钢铁研究院的GK银汞胶囊 ) ;银汞粘接剂Super-BondDLinerⅡPlus(日进公司 ) ;Charisma超微玻璃填料光固化复合树脂 (德国贺利氏 -古莎牙科材料厂生产 ) ;GIC -I型玻璃离子粘固剂 (上海青浦齿科材料厂生产 ) ;DyractA…     

两种材料修复牙体楔状缺损疗效比较

目的：观察比较玻璃离子和光固化树脂两种材料修复牙体楔状缺损的治疗效果。方法 ２０６例患者４６２颗楔状缺损患牙。每一患者随机选一侧患牙采用玻璃离子粘固剂（富士Ⅱ型）直接充填修复,另一侧采用光固化树脂充填修复,追踪２年,比较其疗效。结果 采用玻璃离子粘固剂修复２３７颗患牙,成功２２５颗,成功率９４．９４％,采用光固化树脂充填修复２２５颗患牙,成功１４６颗,成功率６４．８９％。结论 玻璃离子粘固剂直接充     

Dyract与牙齿间密合度的扫描电镜观察

目的：观察新型复合树脂材料Ｄｙｒａｃｔ与牙齿间密合度。方法：应用扫描电镜技术。结果：低倍镜下样品全貌密合度好；放大１０００倍观察４牙合壁、龈壁均无微缝隙。４牙中仅１牙轴壁处有２μｍ左右微缝隙，可能是填压不紧形成的。结论：Ｄｙｒａｃｔ与牙齿间密合度良好。     

银粉玻璃离子和玻璃离子水门汀乳牙充填的疗效比较

银粉玻璃离子充填材料（glass ionomer silver reinforecd restorative）是近年来用于临床的新型充填材料之一，是一种具有很高抗压强度和较强黏结性的牙体修复材料。化学固化玻璃离子水门汀（glass ionomer cement，GIC）是乳牙牙体充填的常用材料，其突出的是它能与牙齿组织形成离子链结合，与釉质、牙本质均有良好的黏结性能。3年来我们用两种材料对乳牙牙体充填的临床效果进行观察，报道如下。     

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。     

3种充填材料应用于牙颈部非龋性缺损的边缘封闭性研究

目的　比较3种不同材料充填牙颈部非龋性硬组织缺损后的密合度及微渗漏情况,为临床选择合适的修复材料提供借鉴。方法　拟收集临床即刻拔除的无龋前磨牙120颗,随机分为3组,每颗牙颊面近颈1/3处制备V类洞,分别充填GC Fuji Ⅱ光固化玻璃离子、Polofil Supra（波洛菲）通用型光固化树脂及3M z350纳米树脂。通过染料渗透实验,倒置金相显微镜下测量充填体边缘微缝隙的宽度及染料渗漏程度。结果　3种充填材料边缘均有染料渗入,渗入深度由小到大排序依次为:3M z350树脂＜波洛菲通用型光固化树脂＜GC Fuji II光固化玻璃离子,3组比较均有统计学差异（P＜0.01）;显微镜下测量3种充填物边缘与牙体间的缝隙宽度分别为:GC Fuji II光固化玻璃离子（22.62±2.46）μm、波洛菲通用型光固化树脂（15.91±2.51）μm、3M z350纳米树脂（15.16±2.12）μm。波洛菲与z350纳米树脂相比无差异（P＞0.05）,2种复合树脂材料与GC玻璃离子均有差异（P＜0.05）。结论　波洛菲树脂与z350纳米树脂边缘封闭性优于GC Fuji II光固化玻璃离子。     

银粉加强型玻璃离子制作核桩的固位力对比研究

目的 以实验方法比较银粉玻璃离子（GISRR）可塑性核桩和铸造核桩的固位力。方法 在两组各10枚离体前磨牙分别制作铸造核桩和银粉玻璃离子可塑性核桩,测试其固位力并进行比较。结果 铸造核桩组固位力为（17.567±12.765）kg,可塑性核桩组为（32.197±15.581）kg,t检验P<0.05,有显著性差异。结论 银粉玻璃离子可塑性核桩固位力优于铸造核桩。     

Influence of restorative techniques on marginal adaptation and dye penetration around Class V restorations

The aim of this study was to observe the influence of restorative techniques on marginal adaptation and dye penetration around Class V restorations simulating abfraction lesions. Sixty mandibular premolars were divided into six groups (n = 10) using different restorative materials. Cavity preparation presented the gingival wall localized in dentin and the incisal wall in enamel. Replicas of abfraction lesions were obtained and viewed under a stereomicroscope for adaptation assessment. All teeth were subjected to thermocycling and mechanical load cycling and immersed in 0.5% methylene blue dye (pH 7.2) for four hours. The results were tabulated and submitted to Kruskal-Wallis tests, which were significant for the dentin margin with lower microleakage values for primer/Vitremer, followed by Clearfil SE Bond/Durafill VS and Clearfil SE Bond/Z100 in qualitative and quantitative methods (P < 0.05). The enamel margin had no significant difference for microleakage values for all groups. There was no statistically significant difference among the substrates for marginal adaptation. The Spearman coefficient illustrated a direct relation between enamel and dentin for microleakage evaluation (P < 0.0001). The data demonstrated no difference for marginal fit by chi-square test. It can be concluded that all groups had microleakage in different degrees, with the lowest values for resin-modified glass ionomer.     

Microleakage comparison of dentin bonding systems with glass ionomer.

Glass-ionomer cements have been suggested as substitutes for dentin-bonded composites. This investigation was designed to compare microleakage of glass-ionomer restorations with that of dentin-bonded composite restorations. Eighty extracted human molars were used in this study. Class V cavities were prepared on the mesial and distal surfaces of each tooth. The distal cavities were restored with Ketac-Fil Glass Ionomer (ESPE). The mesial cavities were divided into four groups and treated with four different dentin bonding systems: Gluma (Columbus Dental), Tenure (two-part powder system; second version, Den-Mat), Scotchbond 2 (3M), and an experimental ferric oxalate system. The commercial materials were placed according to the manufacturers' instructions. The teeth were then thermocycled 3800 cycles between 5 degrees C and 55 degrees C, subjected to silver nitrate staining, and sectioned for microleakage evaluation by three evaluators on a scale of 0 to 4. The ferric oxalate system exhibited significantly less microleakage (median score = 1; Wilcoxon paired testing, p = 0.01) than the glass ionomer (median score = 3). The other dentin bonding systems were similar in microleakage to the glass ionomer (median score = 3).     

Effects of Nd: YAG laser irradiation on the adaptation of composite resins to root dentin

One of the most important goals of the restoration of endodontically treated teeth with a composite resin post system is to achieve good adaptation of the composite material to dentin walls to prevent microleakage apically and coronally. In post core systems, to avoid microleakage between the dentin wall and resin material, laser irradiation may seem to be an alternative therapy for increasing adaptation quality. The aim of this study was to investigate the adaptation of a packable composite resin to lased root canal dentin when it was used as post material. Forty-five freshly extracted human teeth were selected and post spaces were prepared. The teeth were divided into three groups. In group 1 the dentin of the post spaces were etched with 35% phosphoric acid, in group 2 the dentin surfaces were irradiated with an Nd: YAG laser, and in group 3 the dentin surfaces were initially treated with the laser and then etched. The teeth of all groups were obturated with a bonding agent and composite. The groups were divided into two subgroups: a group for the scanning electron microscope (SEM) study and a group for the microleakage study. The lased group showed poor adaptation and more microleakage was detected (p<0.05; variance analysis). The laser beam and acid-etching showed no advantage compared to the acid-etching alone (p>0.05). The Nd: YAG laser irradiation adversely affects adhesion to dentin for using composite resin as a post material and does not constitute an alternative to acid-etching.     

银汞合金充填应用树脂粘结剂的作用研究

目的：研究银汞合金充填时应用树脂粘结剂的作用。方法：进行染料渗透试验和扫描电镜观察。结果：使用粘结剂组染料渗漏的例数少、程度轻，差异性非常显著；扫描电镜可见粘结剂与洞壁和银汞合金均有较好粘结，密合度好。结论：银汞合金充填应用树脂粘结剂可以明显减少微渗漏和增加洞壁密合度。     

六种黏结剂黏固的铸造嵌体边缘的微渗漏研究

目的：用不同黏结剂，以嵌体为例，对边缘微渗漏进行分析比较和评价，为临床选择黏结剂提供参考依据。方法：选择24个近期拔除的磨牙制备成近中殆远中面嵌体洞型，随机分为6组，分别用磷酸锌水门汀，聚羧酸锌水门汀，3M ESPE Ketac（德国），3M ESPE RelyX^TM luting cement（美国），SHOFU CX-plus Glass polyalkenoqte（日本），3M ESPE RelyX^TM ARC（美国）树脂类黏结剂黏固，经恒温保存，染色，二次纵剖牙体，体视显微镜观测微渗漏。结果：磷酸锌水门汀黏固的铸造嵌体微渗漏最大，3M ESPE RelyX^TM ARC树脂类黏固的铸造嵌体微渗漏最小。结论：6种黏结剂黏固的嵌体边缘微渗漏差异有显著性并依次减小，6种黏结剂黏固的嵌体与牙体间的边缘密合度差异有显著性。     

不同粒度车针牙体预备对基底冠适合性影响的研究

目的：比较不同粒度金刚砂车针预备的牙体对烤瓷修复体基底冠适合性的影响。方法：采用4种不同粒度车针对预备牙面进行打磨,根据最终使用车针型号的不同将离体牙试件分为4组,分别制取印模并制作基底冠。采用玻璃离子水门汀将基底冠粘固在牙体上,评价其微渗漏情况和适合性。结果：预备体表面采用车针打磨至不同水平的各组牙试件,经玻璃离子粘固后的微渗漏等级之间存在显著性差异（P〈0．05）,各组基底冠与牙体之间的粘固剂厚度也存在显著性差异（P〈0．01）。结论：随车针粒度的减小,牙预备体与镍铬合金基底冠之间的适合性逐渐提高。     

比较6种口腔材料对体外生物膜形成的影响

目的比较体外混合菌在不同充填材料表面形成早期生物膜的能力,探讨生物膜状态下不同充填材料细菌形成的差异。方法用6种不同修复材料按临床比例制成试件各3件,将各试件放入国际标准菌株牙龈卟啉单胞菌、具核梭杆菌、伴放线放线杆菌、粘性放线菌、血链球菌、变形链球菌混合培养24h,使之在试件表面形成生物膜。在激光共聚焦扫描显微镜(LCSM)下观察生物膜厚度和平均荧光强度,比较不同充填材料表面生物膜细菌形成的差异。结果形成的生物膜平均厚度依次为聚羧酸锌水门汀>磷酸锌水门汀>玻璃离子体水门汀>复合树脂>银汞合金>富士Ⅱ型玻璃离子水门汀。组间比较发现:四种充填材料生物膜厚度无统计学的差异,富士Ⅱ型玻璃离子水门汀、银汞合金的生物膜厚度与两种垫底材料之间都有显著性差异,复合树脂、玻璃离子体水门汀、磷酸锌水门汀的生物膜厚度与聚羧酸锌水门汀有显著性差异。结论材料表面形成的不同生物膜厚度提示:富士Ⅱ型玻璃离子水门汀、银汞合金具有较强的抑制生物膜形成的能力。