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1.
根管冲洗液对牙本质、牙釉质微硬度的影响 总被引:5,自引:2,他引:3
目的 评价根管冲洗液对牙本质、牙釉质微硬度的影响。方法 收集团正畸拨除的新鲜前磨牙44颗,将牙冠沿牙长轴剖开,用3%双氧水,5%次氯酸钠,17%EDTA及氯仿分别处理5、15min,采用微硬度测定仪测定不同处理时间前后的牙本质、牙翻质微硬度。结果 处理后的牙本质、牙翻质微硬度均显著降低,且与处理时间相关。结论 不同化学冲洗液对牙本质、牙釉质微硬度均产生一定的影响。 相似文献
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3.
MTAD根管冲洗液对牙本质、牙釉质微硬度影响的研究 总被引:1,自引:0,他引:1
目的:评价MTAD根管冲洗液对牙本质、牙釉质微硬度的影响。方法:收集新鲜完整的前磨牙48个,截取牙冠并沿牙体长轴剖开,分别用30mL/L过氧化氢液、50g/L次氯酸钠液、MTAD液、13g/L次氯酸钠液处理牙本质、牙釉质5、15min,采用微硬度测定仪测定处理前、后两个时间点上牙本质、牙釉质的微硬度。结果:与30mL/L过氧化氢液和50g/L次氯酸钠液相比,使用MTAD液和13g/L次氯酸钠液处理后的牙本质、牙釉质微硬度的降低幅度不明显。结论:通过与30mL/L过氧化氢液、50g/L次氯酸钠液的对比研究发现,MTAD冲洗液对牙本质、牙釉质微硬度的影响明显小于前两者, 13g/L次氯酸钠冲洗液的影响与MTAD的相似,MTAD液联合13g/L次氯酸钠液的根管冲洗方法值得推荐。 相似文献
4.
不同根管冲洗液对根管长度测定仪测量准确性的影响 总被引:7,自引:0,他引:7
目的体外研究不同根管冲洗液对根管长度测定仪(Root ZX)测量准确性的影响。方法选用30颗离体牙(50个根管)及琼脂凝胶模型,在3%过氧化氢、0.9%NaCl、0.12%洗必泰液、17?TA和干燥根管五种环境下,用Root ZX测定根管的长度;以测量根管实际长度为对照。结果五种环境下,Root ZX测定的根管长度与根管实际长度无显著性差异(P>0.05);电测值与实际值相比,准确率达到90.4%.结论Root ZX测量准确性不受根管介质影响;与根管干燥和潮湿无关。 相似文献
5.
目的研究4种常用根管冲洗液及血液对根尖定位仪测量准确性的影响。方法收集40颗根尖孔发育完成的单根管离体牙构建体外实验模型。测量根管工作长度实际值;应用Raypex-5根尖定位仪分别测量在根管内灌注4种冲洗液(生理盐水、体积分数3%过氧化氢溶液、质量分数5.25%次氯酸钠溶液、体积分数17%乙二胺四乙酸溶液)和血液介质环境下的根管工作长度测量值。对测量数据进行单因素方差分析。结果 40个根管的工作长度实际值和在生理盐水、体积分数3%过氧化氢溶液、质量分数5.25%次氯酸钠溶液、体积分数17%乙二胺四乙酸溶液及血液5种介质中根尖定位仪根管工作长度测量值分别为(17.61±2.25)mm、(18.18±1.33)mm、(17.89±1.30)mm、(17.77±1.56)mm、(16.58±1.38)mm和(16.44±1.61)mm,差异无统计学意义(F=1.963,P=0.091)。结论 Raypex-5测量根管工作长度的准确性不受根管内残留冲洗液和血液的影响。 相似文献
6.
目的对慢性根尖周炎患牙根管治疗过程中采用3种不同根管冲洗液进行根管预备,分析治疗前后根管内4种可疑致病菌的检出情况,了解不同冲洗液对这些可疑致病菌的抑制作用,为根管预备时冲洗液的选择和应用提供微生物学依据。方法选取60颗慢性根尖周炎患牙(单根管),根据根管预备时采用不同冲洗液随机分为3组(每组20颗):Na Cl O组(根管冲洗液为2.5%次氯酸钠,sodium hypochlorite); H2O2组(根管冲洗液为3%双氧水,hydrogen peroxide); PVP-I组(根管冲洗液为1%聚维酮碘,Povidone iodine,怡速欣)。分析根管治疗前后临床指数(clinical periapical index,CPI);同时采集根管预备前后患牙根管内感染物,提取细菌基因组DNA,合成针对粪肠球菌(Enterococcus faecalis,E.f)、具核梭杆菌(Fusobacterium nucleatum,F.n)、牙龈卟啉单胞菌(Porphyromonas gingivalis,P. g)和牙髓卟啉单胞菌(Porphyromonas endodontalis,P. e)的16S r DNA基因的特异性引物,运用实时荧光定量PCR(qRT-PCR)技术,比较分析E.f、F.n、P.g及P.e的检出率和检出量。结果 3组治疗前、后E.f、F.n、P.g和P.e的检出率相同,但可疑致病菌的检出量均有下降。其中3组间比较E.f、F.n和P.g检出量的下降率经统计学检验有差异(P<0.05),而P.e检出数量下降无显著差异(P>0.05); 2组间比较发现Na Cl O组和PVP-I组间E.f、F.n和P.g检出量的下降率统计学检验无差异(P>0.05); Na Cl O组和PVP-I组分别与H2O2组比较,E.f、F.n和P.g检出量的下降率大,差异有统计学意义(P<0.05)。PVP-I组P.e检出量的下降率大于H2O2组,差异有统计学意义(P<0.05)。结论使用3种不同根管冲洗液进行根管预备,能明显地减少感染根管内的E.f、F.n、P.g和P.e的量;与3%双氧水比较,用2.5%NaClO和1%PVP-I根管冲洗液对E.f、P.g和F.n抑制作用更明显;用1%PVP-I对P.e的抑制作用更明显。 相似文献
7.
目的:采用MTT法比较臭氧水溶液与临床常用根管冲洗液对L929细胞的细胞毒性。方法:应用碘量法测定一种臭氧发生器产生臭氧水溶液的最高浓度。体外培养L929细胞,分别以2.15mg/L臭氧水溶液(实验测得最高浓度臭氧水溶液)、3%过氧化氢液、1%次氯酸钠和17%EDTA液作用于细胞6h、12h和24h,生理盐水作为空白对照组,采用MTT法检测不同时间不同组细胞增殖度,测定各组细胞活性。结果:试验用臭氧发生器所产生最高浓度臭氧水溶液浓度约2.15mg/L;MTT实验结果显示,2.15mg/L臭氧水溶液对L929细胞无明显细胞毒性,与阴性对照生理盐水组相比不具有统计学差异。而3%过氧化氢、1%次氯酸钠和17%EDTA液均具有显著的细胞毒性,且随时间延长表现出更强的细胞毒性。细胞毒性按1%次氯酸钠、3%过氧化氢、17%EDTA顺序递减。结论:2.15mg/L臭氧水溶液具有优良的生物相容性,细胞毒性显著低于临床常用的其他根管冲洗剂。 相似文献
8.
刘晓辉 《国际口腔医学杂志》2000,(1)
牙髓治疗中为获得清洁无菌的根管,要进行机械和化学预备。有研究表明,根管冲洗液对根管壁牙本质的机械、物理和化学性质均有影响。本实验的目的是评价不同冲洗液对根管壁牙本质微硬度的影响。 材料和方法 将18颗大小、形态相近的完整离体上切牙作为研究对象。从釉牙骨质界处截除牙冠,抽去牙髓,用K型锉按梯形预备法扩根管至50~#,根管冠部1/2用3~# Gates-Glidden牙钻扩开。将所有牙根随机 相似文献
9.
几种根管冲洗液组合对粪肠球菌感染根管体外抗菌研究 总被引:1,自引:1,他引:0
目的:比较本实验室研制的根管润滑剂与不同浓度次氯酸钠组合用于粪肠球菌感染根管预备冲洗的抗菌效果。方法:将145颗单根管人离体牙消毒,随机选取5颗置于无菌培养基中培养作为阴性对照,其余140颗接种粪肠球菌4周,按照不同的冲洗组合随机分为14组,使用ProTaper器械按照冠根向深入法进行机械预备,分别在预备冲洗前、预备冲洗中和预备冲洗后进行细菌取样培养计数,并进行统计学分析。结果:与双氧水联合生理盐水组以及蒸馏水对照组相比,各处理组在冲洗过程中与冲洗结束后,均不同程度的降低了根管中的细菌的数量,其中含5.25%次氯酸钠的四种组合处理后菌数减少最为明显,较其它各组差异显著。结论:本实验室研制的根管润滑剂与5.25%次氯酸钠组合抗菌效果最佳,与G lyde凝胶配合次氯酸钠组没有显著差异。 相似文献
10.
树脂黏结剂黏结强度的研究进展 总被引:1,自引:1,他引:0
随着口腔修复学的发展以及牙列缺损患者对美观要求的提高,烤瓷修复体已经成为固定修复的主要方式,大量实践证明树脂黏结水门汀对烤瓷尤其全瓷修复体的黏结具有非常好的效果。该文对近年来常用树脂黏结水门汀黏结强度及其影响因素等方面进行综述。 相似文献
11.
Keita Taguchi Keiichi Hosaka Masaomi Ikeda Ryuzo Kishikawa Richard Foxton Masatoshi Nakajima Junji Tagami 《Journal of prosthodontic research》2018,62(3):330-336
Purpose
The use of warm air-blowing to evaporate solvents of one-step self-etch adhesive systems (1-SEAs) has been reported to be a useful method. The purpose of this study was to evaluate the effect of warm air-blowing on root canal dentin.Methods
Four 1-SEAs (Clearfil Bond SE ONE, Unifil Core EM self-etch bond, Estelink, BeautiDualbond EX) were used. Each 1-SEA was applied to root canal dentin according to the manufacturers’ instructions. After the adhesives were applied, solvent was evaporated using either normal air (23 ± 1 °C) or warm air (80 ± 1 °C) for 20 s, and resin composite was placed in the post spaces. The air from the dryer, which could be used in normal- or hot-air-mode, was applied at a distance of 5 cm above the root canal cavity in the direction of tooth axis. The temperature of the stream of air from the dryer in the hot-air-mode was 80 ± 1 °C, and in the normal mode, 23 ± 1 °C. After water storage of the specimens for 24 h, the μTBS were evaluated at the coronal and apical regions. The μTBSs were statistically analyzed using three-way ANOVA and Student’s t-test with Bonferroni correction (α = 0.05).Results
The warm air-blowing significantly increased the μTBS of all 1-SEAs at the apical regions, and also significantly increased the μTBS of two adhesives (Estelink and BeautiDualBond EX) at coronal regions.Conclusions
The μTBS of 1-SEAs to root canal dentin was improved by using warm air-blowing. 相似文献12.
Kerstin Bitter Ani Hambarayan Konrad Neumann Uwe Blunck Guido Sterzenbach 《European journal of oral sciences》2013,121(4):349-354
Irrigation after post space preparation and its effects on the bond strength of different adhesive strategies are still an issue of interest. The aim of the present study was to investigate the effects of various irrigation protocols (IPs) on the push‐out bond strengths of fiber posts. One‐hundred and fifty extracted human anterior teeth were divided into three groups (n = 50 each) and endodontically treated. The post space was irrigated before post placement using the following five IPs in each group: IP1 (control): 5 ml of distilled water; IP2: 5.25% sodium hypochlorite (NaOCl) applied with passive ultrasonic irrigation (PUI); IP3: 1% NaOCl applied with PUI; IP4: 18% ethylenediaminetetracetic acid (EDTA) followed by 5.25% NaOCl; and IP5: 2% chlorhexidine (CHX). Fiber posts placement in each group was performed using three different adhesive strategies. A self‐etch adhesive system revealed higher bond strength (16.2 ± 6.9 MPa) compared with an etch‐and‐rinse adhesive (8.5 ± 4.2 MPa) and a self‐adhesive resin cement (9.2 ± 4.7 MPa). The use of 18% EDTA/5.25% NaOCl increased the bond strength of the self‐adhesive resin cement. Conversely, this IP decreased the bond strength for the etch‐and‐rinse adhesive system, whilst 1% NaOCl enhanced the bond strength for the same system. Consequently, each adhesive strategy may need to be adapted to a specific IP. 相似文献
13.
目的 研究不同根管封闭剂和清洗方法对纤维桩粘接强度的影响,探讨二者对纤维桩粘接强度是否存在交互影响作用。方法 48颗离体下颌前磨牙行完善根管治疗后,根据根管封闭剂随机分为两组,A组采用Endofil封闭剂(丁香酚类),B组采用AH-plus封闭剂(树脂类)。桩道预备后每组再根据根管清洗方法分为3个亚组(每组8颗):A1、B1组采用0.9%NaCl溶液清洗;A2、B2组采用17%乙二胺四乙酸(EDTA)+5.25%NaClO+0.9%NaCl溶液清洗;A3、B3组采用17%EDTA+5.25%NaClO+0.9%NaCl溶液+超声清洗。采用RelyXTMUnicem树脂粘接剂黏固纤维桩1周后,行薄片推出实验。对结果进行三因素方差分析及Turkey检验。采用扫描电子显微镜(SEM)观察根管内壁的超微形态。结果 6组的纤维桩粘接强度分别为A1组(7.96±2.23) MPa,A2组(9.95±2.89)MPa,A3组(18.88±3.69)MPa,B1组(11.41±3.71)MPa,B2组(14.00±4.04)MPa,B3组(19.14±3.27)MPa。三因素方差分析表明:不同的根管封闭剂与清洗方法具有交互作用(P<0.05); B1组粘接强度大于A1组,B2组大于A2组(P<0.05),B3与A3组无明显差异(P>0.05)。SEM显示A3、B3组的根管内壁玷污层最少,牙本质小管完全开放。结论 采用0.9%NaCl溶液、17%EDTA+5.25%NaClO+0.9%NaCl溶液清洗根管时,使用丁香酚类根管封闭剂较树脂类根管封闭剂的纤维桩粘接强度降低;超声联合17%EDTA+5.25%NaClO+0.9%NaCl溶液清洗根管,两种根管封闭剂对纤维桩粘接强度的影响无明显差异。 相似文献
14.
Effect of root canal filling materials containing calcium hydroxide on the alkalinity of root dentin 总被引:2,自引:0,他引:2
Abstract The effect of root canal filling pastes containing calcium oxide resp. calcium hydroxide on the alkalinity of extracted human teeth was investigated using a colour indicator (cresol red). An aqueous suspension of calcium hydroxide (Pulpdent), which is normally used for temporary root canal filling, most consistently produced alkalinity. Removal of the smear layer following instrumentation of the root canal led to increased proportion of alkaline-positive spots in dentinal locations distant from the canal. A clearly smaller effect was found with a calcium salicylate cement (Sealapex) and an oil-paste (Gangraena Merz), both of which are available for definite root canal fillings. Following removal of the smear layer, these hard-setting preparations caused moderate alkalinity in dentin adjacent to the canal but no effect was observed in locations more distant from the canal. Neither at locations adjacent to nor distant from the root canal was alkalinity found when another calcium salicylate cement (Apexit) was used. Apparently the release of hydroxyl ions into root dentin from calcium hydroxide containing root canal filling materials is not solely influenced by the absolute amount of calcium hydroxide, but also depends on other ingredients which variably inhibit the release of these ions. 相似文献
15.
Effect of ultrasonic and sonic activation of root canal sealers on the push‐out bond strength and interfacial adaptation to root canal dentine
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P. E. B. Wiesse Y. T. Silva‐Sousa R. D. Pereira C. Estrela L. M. Domingues J. D. Pécora M. D. Sousa‐Neto 《International endodontic journal》2018,51(1):102-111
16.
目的:评价不同根管内壁处理方法对树脂改性玻璃离子水门扪‘与根管牙本质粘接强度的影响。方法:新鲜拔除的42个完整前牙或单根管前磨牙,于釉一牙骨质界处水平截断,根据不同处理根管壁+粘接纤维桩的方法随机分为7组:A组:无酸蚀+GC Fuji I;B组:酸蚀+GC Fuji I;C组:酸蚀+singlebond2+GCFujiI;D组:无酸蚀+GCFuji ⅡLC;E组:酸蚀+GC VujiⅡLC;F组:酸蚀+singlebond2+GCVujiⅡLC:G组:酸蚀+singlebond2+ClearfilDCCoreAutomix。粘结处理后垂直牙根长轴切割成1mm厚薄片,在万能测试机上进行微推出测试。结果:7组粘接强度分别为A组(1.6367±0.2673)MPa;B组(1.9933±0.1906)MPa;C组(2.4800±0.5349)MPa;D组(3.1967±0.7068)MPa:E组(3.9385±0.2782)MPa;F组(5.5317±0.5545)MPa;G组(8.2510±0.7757)MPa。D组、E组、F组均相应高于相同根管内壁处理方法的A组、B组、C组(p〈0.05),但均低于G组如〈O.05);F组〉E组〉D组(P(0.05),ABC三组间无显著差异(p〉O.05)。结论:不同方法处理根管内壁对粘接材料与根管牙本质间的粘接强度有影响。 相似文献
17.
目的评价不同表面处理方法对激光预备牙本质形态学变化和黏结强度的影响。方法2013年5月至7月在中国医科大学附属口腔医院收集20~40岁新鲜拔除的活髓第三磨牙20颗及根尖发育完全的前磨牙8颗,铒、铬:钇钪镓石榴石(Er,Cr:YSGG)激光处理暴露的牙争面牙本质,然后按照不处理、37%磷酸酸蚀、自酸蚀及0.5mol/LEDTA调节各自分为4组,使用扫描电子显微镜(SEM)观察前磨牙牙本质处理面形态;第三磨牙使用Adper easy bond或Single bond 2黏结,Z350树脂逐层堆积树脂冠后,制作哑铃型试件进行微拉伸黏结强度测试,采用单因素方差分析进行组间差异比较。结果SEM观察发现:前磨牙激光预备后不处理组(对照组)牙面不规则,无玷污层,牙本质小管开放;磷酸酸蚀组牙本质表面最规则,自酸蚀组和EDTA处理组处理后表面变化不如磷酸酸蚀组明显。微拉仲黏结强度测试结果显示,第三磨牙分组后的3种处理方式牙本质黏结强度均显著高于对照组(P〈0.05),磷酸酸蚀组黏结强度最强(P〈0.05),而自酸蚀组及EDTA处理组差异无统计学意义(P〉0.05)。结论37%磷酸酸蚀、自酸蚀及0.5mol/LEDTA调节3种处理均可提高激光预备的牙本质黏结强度,37%磷酸酸蚀组获得最佳短期黏结效果。 相似文献
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Kerstin Bitter Sebastian Paris Cindy Pfuertner Konrad Neumann rej M. Kielbassa 《European journal of oral sciences》2009,117(3):326-333
This study correlated the morphological characteristics with the bond strengths of various resin cements used for bonding fiber posts to root canal dentin. Fifty glass-fiber posts (FRC Postec Plus) were luted into the root canals of extracted human anterior teeth using five resin cements ( n = 10): Panavia F 2.0, PermaFlo DC, Variolink II, RelyX Unicem, and Clearfil Core. Before insertion of the post, the adhesive systems were labeled with fluorescein and the resin cement was labeled with rhodamine isothiocyanate. The roots were sectioned into three slices (of 2 mm thickness), and each slice was analyzed using confocal laser scanning microscopy in dual fluorescence mode to determine hybrid layer thickness, the number of resin tags, and the number of broken tags. Bond strengths were measured using a micro push-out test. Bond strengths to root canal dentin, as well as the morphological characteristics, were significantly affected by the materials. However, these factors did not correlate. The self-adhesive resin cement, which showed the formation of a hybrid layer and resin tags only sporadically, had the highest bond strengths. These results indicate that chemical interactions between the adhesive cement and hydroxyapatite may be more crucial for root dentin bonding than the ability of the same material to hybridize dentin. 相似文献
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目的:体外实验测量不同根管口直径单根牙纤维桩粘固后的振动频率和拉伸强度,研究根管口直径对纤维桩粘结后振动频率和粘接强度的影响.方法:利用RTD纤维桩配套钻头制备不同根管口直径的试件,桩道预备后采用RelyX Unicem树脂粘结系统进行纤维桩核修复.将微型加速度传感器粘固于树脂核上,在一定外激励作用下,采集加速度变化信号,经过傅里叶转换,获得纤维桩的振动频率,采用万能试验机测试纤维桩的拉伸强度.结果:不同根管口直径组纤维桩粘接后的振动频率和粘结强度均存在统计学差异(P<0.05).结论:纤维桩粘结后的振动频率可以反映出根管口直径的变化,提示振动频率可以作为一项重要指标反映纤维桩的粘结性能. 相似文献