牙体充填材料和根管桩对根管冠向封闭能力的影响

目的 :研究临床常用牙体充填材料和根管桩对根管冠向封闭能力的影响。方法 :6 0个离体单根管牙从颈部截断 ,逐步后退法预备根管 ,CCQ糊剂加牙胶尖侧压法充填 ,横断面统一制备 3mm× 2mm× 2mm洞形。随机分为 4组 :复合树脂组、银汞合金组、根管桩组、对照组 (不作洞形充填 )。经冷热循环 ,牙体表面封闭后行染液渗漏 ,制备透明牙标本 ,体视显微镜观察渗漏深度。结果 :各组实验牙均发生不同程度的染液渗漏 :复合树脂组 ( 3.35± 2 .0 1)mm和银汞合金组 ( 3.6 7± 1.4 0 )mm渗漏深度最短 ,两者无显著性差异(P >0 .0 5 ) ;根管桩组 ( 6 .0 0± 2 .13)mm渗漏深度长于前两组 (P <0 .0 5 ) ;对照组 ( 10 .4 7± 3.6 9)mm渗漏深度最长 ,与其他各组均有显著性差异 (P <0 .0 1)。结论 :复合树脂和银汞合金在根充后冠向封闭能力无明显差异 ;根管桩的使用会加大微渗漏程度     

可流动复合树脂充填楔状缺损的体外微渗漏研究

目的　研究可流动复合树脂充填楔状缺损离体牙模型的边缘微渗漏情况。方法　选择因正畸拔除的上颌前磨牙2 4个,于颊侧颈部釉牙骨质界处备V型洞后,随机分为3组,分别采用Aelieteflo可流动复合树脂,DyractAP复合体,GICTYPEII化学固化玻璃离子进行充填。经力循环、热循环后,2 %亚甲基蓝染色2 4h ,将每个牙齿自颊舌向沿长轴连续切3片。体视显微镜放大4 0倍观察充填体边缘染液渗漏情况。结果　3组间充填体微渗率差异有显著性(P <0 .0 0 1) ,以Aelieteflo材料的边缘微渗率最低(P <0 .0 5 )。3组牙合侧壁与龈侧壁微渗率间差异无显著性(P =0 .2 6 3)。结论　可流动复合树脂用于楔状缺损充填可以获得较好的边缘封闭性。     

关于粘接银汞合金和复合树脂联合充填的研究:2.牙颈部单面洞的洞壁适合性

作者在前述研究的基础上,对银汞合金和复合树脂充填的洞壁适合性进行了研究。在24个离体人牙上制备了60个牙颈部单面盘形洞,并随机分成以下3个实验组进行充填。1组;用Panavia树脂粘接剂涂布洞壁和银汞合金充填;2组:用Claer-fil New Bond粘接剂涂布洞壁和复合树脂Photopo-sterior充填;3组:用Panavia树脂粘接剂涂布洞壁和用银汞合金充填至低于洞缘1mm处,1小时后,涂Clearfil New Bond粘接剂和用复合树脂Photopo-sterior充填。每组20牙,其中半数酸蚀全部洞壁,另半数仅酸蚀牙釉质壁.将所有受试牙置37℃水中6     

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   

银汞合金与P60复合树脂充填后牙窝洞的疗效观察

目的　对比银汞合金和P6 0复合树脂充填后牙窝洞的疗效。方法　应用银汞合金充填后牙窝洞4 0例99颗牙,应用P6 0复合树脂充填后牙窝洞4 5例112颗牙,经18～30个月复查。结果　银汞合金和P6 0复合树脂充填Ⅰ类洞成功率为95 .0 %和97.0 % ,无统计学差异;充填Ⅱ类洞成功率为76 .9%和95 .6 % ,两者有统计学差异。结论　在观察时间内,P6 0复合树脂充填Ⅱ类洞显示良好的充填效果。     

关于粘接银汞合金和复合树脂联合充填的研究:1.牙颈部单面洞的边缘密封性

作者等综合复合树脂美观、有粘接性、容易操作和银汞合金抗折力好、无聚合收缩、不刺激牙髓等优点,建立起一种新的充填方法即窝洞下部用银汞合金充填,其上覆盖以后牙复合树脂的联合充填法.本文对其窝洞的边缘密封性进行了研究。在22个离体人牙上制备了66个近远中向长4mm、颊舌向长2mm,深2mm的V类洞,随机分成以下5个实验组进行充填.l组:窝洞涂布Panavis E X树脂粘接剂后用银汞合金充填;2组:窝洞涂布Clearfil NewBond粘接剂后用复合树脂Photoposterior充填,3组:窝洞先涂Scotch粘固促进剂,再涂Scotchbond2粘接     

不同充填材料对牙体应力分布的影响

目的研究3种不同材料进行窝洞充填后牙体应力分布情况,为临床充填材料的选择提供理论依据。方法将离体上颌第二磨牙经螺旋CT扫描,使实体结构图象数字化处理,建立其有限元模型。在此模型上对银汞合金、复合树脂及玻璃离子水门汀修复前后的牙体应力分布情况进行数值分析。结果在同样载荷作用下,3种材料修复后牙体的应力云图分布形态和极值基本相同,差异无显著性,但与健康牙比较,最大应力值均降低24.14%。结论银汞合金、复合树脂及玻璃离子水门汀3种不同的充填材料对牙体修复后承载能力的影响基本相同。     

根管治疗后冠部封闭材料的渗漏研究

目的:为临床上根管治疗后采用不同的冠部充填或暂时封闭材料的封闭性能提供理论依据。方法:对常规根管治疗后的80个离体牙分别采用磷酸锌黏固粉(锌封)、锌基 复合体、锌基 银汞合金3种材料充填后进行染料渗漏实验,比较冠渗漏情况。结果:所有的实验组都发生了不同程度的渗漏,经统计学分析,显示对照组和各实验组之间、锌封组与其它两实验组之间的冠渗漏均存在显著性差异;而锌基 复合体组、锌基 银汞合金组之间的差异无显著性。结论:对于根管治疗后不能及时进行冠修复的牙齿应采用永久充填的方法来进行暂时性的冠部封闭,以减少冠渗漏的发生,提高根管治疗的远期成功率;对于临床上冠部充填体损坏时间过长(超过1月)需重新做牙体修复的患牙,建议考虑重新根管治疗或髓腔消毒后再行牙体修复。     

新型牙科充填材料--镓合金的边缘微漏实验研究

目的 研究新型牙科充填材料－镓合金的体外充填以后的边缘微渗漏。方法 选择２０颗离体牙，备洞后，随机分为两组，实验组用镓合金充填，对照组银汞合金充填。采用染料渗透实验，用测量显微镜测出染料渗入牙齿的深度。结果 实验组的染料渗入深度平均值为１０．４微米，对照组的平均值为１１．７微米。结论 镓合金与银汞合金的边缘微漏无显著性差异。     

自制纳米羟磷灰石复合树脂与牙体之间微渗漏的实验研究

目的 检测自制纳米羟磷灰石（NHA）复合树脂与牙体组织之间的边缘密合性。方法 健康离体前磨牙30颗制备Ⅰ类洞型,随机分成3组,分别用NHA复合树脂（A组）、卡瑞斯玛复合树脂（B组）、玻璃离子水门汀（C组）充填修复,经冷热循环实验后,采用2%亚甲基蓝染料渗入法观察充填材料与牙体洞壁间边缘微渗漏的情况。结果 A、B、C组染料的渗漏深度分别为（1.20±0.81）、（1.94±0.70）、（1.73±0.54） mm,3组之间的差异无统计学意义（P>0.05）;3组间渗漏程度的差异也无统计学意义（P>0.05）。结论 作为一种新型牙体修复材料,NHA复合树脂与牙体组织之间具有良好的黏结性能。     

3种充填材料治疗老年人后牙根面龋临床比较

目的　选择老年人后牙根面龋充填治疗的理想材料。方法　 2 79颗患牙随机分成 3组 ,分别用银粉加强型玻璃离子、DyractAP及光固化复合树脂充填治疗 ,随访 18～ 2 4个月。结果　银粉加强型玻璃离子组的成功率为 96 .4 % ,高于光固化复合树脂组 (6 7.12 % ) ,P <0 .0 5 ,与DyractAP组 (92 .4 7% )差异无显著性 (P >0 .0 5 )。结论　银粉加强型玻璃离子治疗老年人后牙根面龋优于光固化树脂     

An evaluation of the retrograde apical seal using dentine bonding materials

Summary. The purpose of this investigation was to compare in vitro retrograde apical leakage of four dentine bonding procedures with amalgam and hot burnished gutta-percha.
Single-rooted teeth were prepared using a standardized stepback flare technique with recapitulation. The teeth were obturated with gutta-percha and sealer using the lateral condensation technique and placed into a saline bath at 37°C for 30 days. The teeth were then randomly divided into seven groups of 22 teeth each. Groups I and II were apically bevelled, and dentine bonding agent with composite resin and dentine bonding agent with unfilled resin applied to the bevelled root faces, respectively. Groups III, V and VI were apically bevelled and prepared to accept a retrograde filling material of dentine bonding agent with composite resin, amalgam with cavity varnish and amalgam without cavity varnish, respective. Group IV had dentine bonding agent and unfilled resin applied to the apical third of the root, and Group VII was apically bevelled and the gutta-percha hot burnished. The teeth were then placed into a water bath at 37°C for 30 days, stained with silver nitrate and the linear dye penetration measured.
The lowest mean leakage value was recorded in Group I, i.e. dentine bonding agent and composite resin (0.31 mm), and the highest value was observed in group VII, i.e. hot burnished gutta-percha (4.60mm); the difference was statistically significant.     

Dyract光固化复合体与银汞合金充填面洞的疗效对比

目的 :比较Dyract光固化复合体与银汞合金充填 牙合面洞的临床疗效。方法 :应用两种材料分别充填 15 4个患牙 ,随访 1.5～ 2年 ,共复查到 12 8个患牙。从边缘密合度、继发龋、磨耗程度三方面来观察疗效。结果 :Dyract光固化复合体的边缘密合度与是否易发继发龋方面优于银汞合金 (P <0 .0 5 ) ,而耐磨耗程度方面差于银汞合金 (P <0 .0 1)。结论 :Dyract光固化复合体黏性性能良好 ,而在承受咀嚼力上还有欠缺     

In vitro study of the sealing ability of four retrograde filling materials

Abstract This in vitro study utilized India ink dye after clearing to evaluate the extent of apical microleakage following reverse filling procedures. Forty single-rooted human teeth divided into 4 groups were chemomechanically prepared and obturated, using the lateral condensation technique with gutta-percha and Grossman sealer. Following obturation, an apicoectomy was performed and retrograde cavities were filled with 4 different materials: Group A: amalgam and varnish; Group B: EBA cement; Group C: Ketac-cem®; Group D: hot-burnished gutta-percha. All teeth were immersed in India ink, decalcified, cleaned, examined through a stereomicroscope, and the depth of linear dye penetration was measured. Statistical analysis showed significantly less dye penetration with EBA cement and amalgam with varnish than with Ketac-cem and hot-burnished gutta-percha.     

老年人根面龋3种材料修复的疗效分析

目的:探讨修复老年人根面龋较理想的材料。方法:将216颗根面龋患牙,分别采用Dyract复合体、光固化复合树脂和玻璃离子水门汀充填修复。随访观察1-2年。结果:观察1年,3种材料修复成功率有显著性差异,Dyract复合体成功率(96.2%)最高;观察2年,Dyract复合体成功率94.9%,明显高于玻璃离子水门汀的成功率77.9%(P<0.01)和光固化复合树脂的成功率61.4%(P<0.01),差异均具有显著性。结论:Dyract复合体是修复根面龋较为理想的材料。     

Evaluation of the sealing ability of amalgam,Cavit, and glass ionomer cement in the repair of furcation perforations

Perforations created in the pulpal floors of 30 extracted molars were repaired with amalgam, Cavit, and light cured glass ionomer cement. After the pulp chambers and access openings were filled with composite resin, the teeth were then immersed in 2% Erythrocin B solution for 1 week. After longitudinal sectioning of the teeth, dye penetration was measured. The results indicated significant differences between the three materials. Light cured glass ionomer exhibited the least dye penetration followed by Cavit and amalgam.     

不同桩核微渗漏情况的体外研究

目的 :比较成品桩钉加复合树脂核、传统银汞桩核和粘结银汞桩核冠向微渗漏情况 ,探讨粘结银汞桩核在后牙修复中的应用前景。方法 :30颗新拔除的磨牙分为 3组 ,分别用成品桩钉加复合树脂核、传统银汞桩核和粘结银汞桩核修复后放入印度墨水中 1周 ,另选择 10颗磨牙作为阴性和阳性对照 ,评价冠方微渗漏情况。结果 :粘结银汞桩核微渗漏明显小于传统银汞桩核 (P <0 .0 1) ;传统银汞桩核与成品桩钉加复合树脂核差异无显著性 (P >0 .0 5 )。结论 :粘结银汞桩核修复可有效降低微渗漏 ,预防桩核修复后因微渗漏导致的并发症     

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。     

渗透树脂对树脂充填体釉质边缘漂白后微渗漏的影响研究#br#

目的    研究渗透树脂对树脂充填体釉质边缘漂白后微渗漏的影响。方法    选择由郑州大学第一附属医院口腔颌面外科门诊提供的因阻生而拔除的第三磨牙45颗,并在其颊面颈部制备V类洞。将所有离体牙随机分为3组,每组15颗,根据操作方法分别记为树脂充填组、树脂充填+冷光美白组和树脂充填+冷光美白+渗透树脂组。3组离体牙充填后进行500次冷热温度循环,然后在2%的碱性品红溶液中浸泡24 h,把离体牙沿颊舌向纵向剖开,用体式显微镜观察,并用S-EYE软件测量染料渗透深度。结果    3组染料渗透深度总的比较,差异有统计学意义（H = 10.182,P < 0.05）。其中,树脂充填+冷光美白组染料渗透深度大于树脂充填组和树脂充填+冷光美白+渗透树脂组,差异均有统计学意义（P < 0.05）;树脂充填+冷光美白+渗透树脂组染料渗透深度与树脂充填组相比,差异无统计学意义（P > 0.05）。结论    漂白剂加重了树脂充填体边缘的微渗漏,同时渗透树脂的应用能有效减少漂白剂对树脂充填体边缘微渗漏的影响。     

Effect of bonded restorations on the fracture resistance of root filled teeth

AIM: To evaluate the fracture resistance of root filled maxillary premolars restored with different techniques. METHODOLOGY: One hundred and twenty single-rooted maxillary premolar teeth were divided randomly into six groups of 20 teeth and subjected to the following procedures: group 1: intact teeth. Group 2: endodontic access cavities prepared. Group 3: MOD cavities were prepared, root canals were filled and no restoration was placed. Group 4: teeth were prepared as group 3 and restored conventionally with amalgam. Group 5: teeth were prepared as group 3 and restored with amalgam using a bonding material. Group 6: teeth were prepared as group 3 and restored with composite resin using the same bonding material. Teeth were embedded in acrylic resin and the loads for fracture strength were applied vertically with a constant speed of 1 mm min(-1). Data were evaluated statistically with anova and Tukey's tests. RESULTS: The mean force of fracture values were 1191.41, 599.86, 233.03, 494.72, 962.81 and 856.48 N for groups 1, 2, 3, 4, 5 and 6, respectively. The fracture resistance of group 5 was similar to group 1 (P > 0.05). The mean force at fracture of group 5 and group 6 was not significantly different. The fracture resistance of groups 5 and 6 was significantly higher than group 4 (P < 0.001). CONCLUSIONS: The group, restored with conventional amalgam, had the weakest resistance to fracture when compared with the bonded restorations. No statistically significant differences were found between the bonded amalgam and composite resin groups.