不同树脂核材料影响纤维桩核整体抗折强度的比较

背景：纤维桩修复中树脂核材料的选择可能影响桩核的整体强度。 目的：比较5种树脂核材料分别与玻璃纤维桩结合后的整体抗折强度。 方法：将50个viva玻璃纤维桩随机分为5组,分别与MEDENTAL双重固化树脂水门汀、伊蒂娜双重固化树脂水门汀、Bisco BisCem树脂水门汀、3M光固化纳米复合树脂P60及PULPDENT双重固化树脂水门汀黏结,将5组桩核的根管部分分别用自凝塑料包埋,固化后固定于万能试验机上并与牙体长轴成135°角加载于核部,加载速度为1.0 mm/min,直至断裂,测得断裂时受力情况。 结果与结论：MEDENTAL双重固化树脂水门汀组、伊蒂娜双重固化树脂水门汀组、Bisco BisCem树脂水门汀组、3M光固化纳米复合树脂P60组及PULPDENT双重固化树脂水门汀组的抗折强度分别为(83.248±7.857),(89.230±4.326),(95.188±5.147),(76.646±6.463),(83.064±3.964) N。除MEDENTAL双重固化树脂水门汀组与PULPDENT双重固化树脂水门汀组抗折强度无差异外,其余各组间两两比较差异均有显著性意义(P < 0.05)。结果表明Bisco BisCem树脂水门汀与纤维桩结合后具有较高的抗折强度。中国组织工程研究杂志出版内容重点：生物材料;骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性;组织工程全文链接：     

不同粘接系统对纤维桩粘接强度的影响

背景：粘接界面尤其是根管壁-粘接剂间是纤维桩修复后接构的薄弱环节,加强粘接剂与根管壁间粘接对提高纤维桩的修复成功率,有重要临床指导意义。 目的：比较自酸蚀粘接系统和全酸蚀粘接系统对纤维桩粘接强度的影响。 方法：选用30颗单根管前牙用于纤维桩粘接实验,每颗牙选用逐步后退法进行预备并进行根管充填。样本分为3组,自酸蚀粘接组、全酸蚀粘接组和空白对照组分别应用自酸蚀粘接系统、全酸蚀粘接系统、传统磷酸酸蚀法处理根管内壁。 结果与结论：自酸蚀粘接组、全酸蚀粘接组和空白对照组的粘接强度分别为(3.24±0.76),(4.09±0.54),(2.85±0.89) MPa。两两相比,不同粘接方法对纤维桩的粘接强度差异均有显著性意义(P < 0.05);扫描电镜观察发现全酸蚀粘接组混合层与牙本质和纤维桩粘接紧密,自酸蚀粘接组混合层只与纤维桩粘接紧密,与牙本质未形成有效连接。提示全酸蚀粘接系统的粘接强度优于自酸蚀粘接系统,具有良好的纤维桩固位性能。     

黏结剂不同使用方式对全酸蚀树脂水门汀与牙本质间黏结性能的影响

背景：在临床治疗过程中,修复体连同黏结材料一同脱落及产生微小渗孔等情况常有发生,因此,探究黏结剂不同使用方式对全酸蚀树脂水门汀与牙本质间黏结性能的影响具有重要的临床意义。 目的：对比黏结剂不同使用方式对全酸蚀树脂水门汀与牙本质间黏结性能的影响。 方法：获取无龋人新鲜拔除的第二磨牙90颗,随机均分为3组,均于常温水冲洗下打磨消除牙冠部位牙釉质,露出牙本质以制备标准黏结面,分别进行不使用黏结剂处理(对照组)、使用经过光照的全酸蚀树脂水门汀处理(实验2组)、使用未经过光照的全酸蚀树脂水门汀处理(实验1组),检测处理后即刻、处理后再经老化处理的微拉伸黏结强度。 结果与结论：处理后即刻,对照组、实验1组、实验2组的微拉伸黏结强度分别为(8.089±3.431),(11.671±2.561),(8.821±2.513) MPa,组间两两比较差异均有显著性意义(P < 0.05);处理后再经老化处理,对照组、实验1组、实验2组的微拉伸黏结强度分别为(1.069±0.421),(7.621±2.061),(4.821±1.513) MPa,组间两两比较差异均有显著性意义(P < 0.05)。表明全酸蚀树脂水门汀与牙本质的结合在黏结剂不同方法的使用中,无论长期还是短期均是使用不光照处理的黏结剂效果最佳。 中国组织工程研究杂志出版内容重点：生物材料;骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性;组织工程     

崩瓷修补的临床试验及体外材料学拉伸强度实验

背景：目前对瓷类修复体后崩瓷修补的研究较多,但缺乏系统性、横向的比较。目的：通过临床试验及体外实验比较树脂常规粘接、硅烷偶联剂处理后树脂粘接及邻面开口式部分冠3种崩瓷修补方法的效果。方法：①临床试验：将90例崩瓷患者随机均分为3组修补,分别采用树脂常规粘接、硅烷偶联剂处理后树脂粘接及邻面开口式部分冠3种崩瓷修补方法,对比3组1年后的修补成功率。②体外实验：将20个瓷试件均分为2组,分别进行树脂常规粘接及硅烷偶联剂处理后树脂粘接处理,检测两组剪切强度;将20个双层瓷试件均分为4组,其中3组黏结面分别进行喷砂、硅烷偶联剂、喷砂联合硅烷偶联剂处理,另1组不做任何处理(对照组),黏结后检测各组试件拉伸强度。结果与结论：树脂常规粘接组、硅烷偶联剂处理后树脂粘接组及邻面开口式部分冠组修复成功率分别为37%,90%,100%。树脂常规粘接组与硅烷偶联剂处理后粘接组剪切强度分别为(13.978±0.343),(10.058±0.64) MPa,组间比较差异有显著性意义(P < 0.01)。对照组、喷砂组、硅烷偶联剂组、联合处理组的拉伸强度分别为(0.68±0.04),(1.00±0.02),(1.31±0.08),(1.09±0.04) kN,组间两两比较差异有显著性意义(P < 0.01)。表明硅烷偶联剂处理后树脂粘接及邻面开口式部分冠崩瓷修补效果优于树脂常规粘接。中国组织工程研究杂志出版内容重点：组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松;组织工程     

纤维桩修复漏斗状前牙根管3种方法的比较

背景：纤维桩具有与天然牙本质接近的弹性模量,在受外力时能够与根管壁保持广泛面接触,与牙本质形成一同质的整体,使应力沿根管壁均匀传导,减少根折的发生。 目的：观察纤维桩3种使用方法在前牙漏斗状残根修复中的临床效果。 方法：选择48例上前牙根管呈漏斗状患者,随机分为3组,分别采用单根纤维桩、复合树脂重塑根管后应用纤维桩及纤维桩主桩加辅桩进行桩核冠修复,随访2年,观察桩核松动、折断和牙根折断情况。 结果与结论：单根纤维桩组发生桩核松动4例、桩核折断4例,修复成功率为64%;复合树脂重塑根管后应用纤维桩组发生桩核松动2例、桩核折断1例,修复成功率为90%;纤维桩主桩加辅桩组发生桩核松动2例,修复成功率为93%。单根纤维桩组修复成功率低于复合树脂重塑根管后应用纤维桩组与纤维桩主桩加辅桩组(P < 0.05),复合树脂重塑根管后应用纤维桩组与纤维桩主桩加辅桩组修复成功率差异无显著性意义。表明使用单根纤维桩直接修复漏斗状残根临床效果不佳,复合树脂重塑根管和纤维桩主桩加辅桩修复前牙漏斗状根管临床效果较好,且纤维桩主桩加辅桩的修复方法临床操作更简单。中国组织工程研究杂志出版内容重点：生物材料;骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性;组织工程全文链接：     

不同纤维桩修复方式影响重度楔状缺损前磨牙的抗折性能

背景：以往的观点认为桩可以增强根管治疗牙的抗折裂强度,但近年来这种观念已引起争议,许多学者认为,根管的预备削弱了牙根,桩进一步增加了折裂的危险。 目的：评价侧向加载条件下,采用不同纤维桩修复方法对重度楔状缺损前磨牙抗折性能的影响。 方法：将50颗正畸拔除的人上颌前磨牙随机分为5组,每组10颗。A组为正常前磨牙;B-E组40颗牙均制备深达颊舌径1/3深度的重度楔状缺损,B组不做任何处理;C组经根管治疗,保留楔状缺损上方颊侧悬突牙体组织,颊、舌根管内采用LuxaPost高强度玻璃纤维桩、LuxaCore双固化冠核复合树脂修复缺损牙体组织;D组经根管治疗,保留楔状缺损上方颊侧悬突牙体组织,颊、舌根管内采用LuxaPost高强度玻璃纤维桩、LuxaCore双固化冠核复合树脂及金属全冠修复缺损牙体组织;E组经根管治疗,去除楔状缺损上方颊侧悬突牙体组织,颊、舌根管内采用 LuxaPost高强度玻璃纤维桩、LuxaCore双固化冠核复合树脂及金属全冠修复缺损牙体组织。检测各组样本折裂强度。 结果与结论：A-E组抗折载荷分别为(1 002.69±147.62),(439.28±66.34),(958.30±101.23),(1 207.09± 143.48),(1 056.44±139.30) N。D组抗折载荷最高(P < 0.01),B组最低(P < 0.01),A、C、E三组间抗折载荷比较差异无显著性意义。表明纤维桩能增强重度楔状缺损牙的抗折能力,并且保留牙体组织有助于提高修复体的抗折性。中国组织工程研究杂志出版内容重点：生物材料;骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性;组织工程全文链接：     

水对3种双固化复合树脂冠核材料弯曲性能的影响

背景：口腔湿热环境会对牙科核材料的力学性能产生影响。 目的：观察水对3种双固化复合树脂冠核材料质量变化率及弯曲性能的影响。 方法：将LuxaCore Smartmix Dual、Para core和Clearfil DC Core 三种牌号双固化复合树脂材料制成      25 mm×2 mm×2 mm标准试件,于(37±1) ℃的蒸馏水中保存 0 d、1 d、1周、2周、3周和1个月后称质量,计算其质量变化率,并在万能试验机上测试三点弯曲性能。 结果与结论：3种复合树脂的质量变化率均随着浸泡时间的增加而增加;对于相同浸泡时间下,3种树脂的质量变化率由大到小排列次序为：LuxaCore Smartmix Dual>ParaCore>Clearfil DC Core。LuxaCore Smartmix Dual树脂强度随浸泡时间的增加而降低;ParaCore树脂强度在浸泡3周内变化不显著(P > 0.05),浸泡时间1个月时强度显著降低(P < 0.05);Clearfil DC Core树脂强度在整个浸泡过程中没有显著性差异(P > 0.05)。LuxaCore Smartmix Dual树脂模量在整个浸泡时间内呈现出下降趋势,但在最初2周的浸泡时间内无明显变化(P > 0.05),当浸泡时间达到3周和1个月时模量显著降低(P < 0.05);与浸泡前比,ParaCore和Clearfil DC Core两种复合树脂的模量值均下降,但这种变化不显著(P > 0.05);3种复合树脂的弯曲性能随着质量变化率的升高而呈现出波动式下降的趋势。综合显示在3种树脂中,Clearfil DC Core的耐水性最佳。中国组织工程研究杂志出版内容重点：生物材料;骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性;组织工程全文链接：     

不同纤维桩主桩材料联合辅桩修复漏斗状残根抗折性的对比

背景：近年来由于玻璃纤维和碳纤维桩核等近牙本质弹性模量材料的使用,临床上获得了比较满意的结果,但在纤维桩核与根管内牙本质的黏结问题、大量牙本质丧失等方面还需要进一步的深入研究。 目的：比较3种桩核系统材料修复下颌第一前磨牙的抗折性,并分析影响因素。 方法：选择因正畸需要而拔除的下颌第一前磨牙36颗,随机分为3组,A组：MACRO-LOCK石英纤维桩联合使用FIBERCONETM辅桩-复合树脂核;B组：镍铬合金桩核;C组：MACRO-LOCK石英纤维桩-复合树脂核。所有桩核均行镍铬合金烤瓷冠修复,固定于万能材料测试机上加载直至标本发生折裂,记录标本破坏时的瞬间力值及实验牙的折裂类型。 结果与结论：各组样本破坏性力学实验测试结果显示,3组间两两相比差异均有显著性意义[(403.99±15.91),(304.31±16.95),(233.48±22.56) N,P < 0.05]。A组牙体组织折裂后可再次修复的可能性明显高于B组。提示纤维主桩联合辅桩进行桩核修复漏斗状残根,其抗折性高于金属桩,折裂模式均为可复性。     

纤维桩研究进展

随着纤维加强树脂研究的进展,纤维桩在临床上得到了广泛地应用。与传统的金属桩相比,纤维桩的强度、硬度、美学性能、抗腐蚀、抗疲劳性能以及生物相容性均比较优越。而且,纤维桩可以通过树脂类粘接剂与根管牙本质之间达到很高的粘接强度,这可以延长修复体的使用寿命,并能减少根折的发生,有利于牙齿的保存和失败后的再修复。拟从纤维桩的种类、性能及粘结等方面做一综述。     

纤维桩研究进展

随着纤维加强树脂研究的进展，纤维桩在临床上得到了广泛地应用。与传统的金属桩相比，纤维桩的强度、硬度、美学性能、抗腐蚀、抗疲劳性能以及生物相容性均比较优越。而且，纤维桩可以通过树脂类粘接剂与根管牙本质之间达到很高的粘接强度，这可以延长修复体的使用寿命，并能减少根折的发生，有利于牙齿的保存和失败后的再修复。拟从纤维桩的种类、性能及粘结等方面做一综述。     

Deproteinized dentin: a favorable substrate to self-bonding resin cements?

The adhesive performance on deproteinized dentin of different self-adhesive resin cements was evaluated through microtensile bond strength (μTBS) analysis and scanning electron microscopy (SEM). Occlusal dentin of human molars were distributed into different groups, according to the categories: adhesive cementation with two-step bonding systems-control Groups (Adper Single Bond 2 + RelyX ARC/3M ESPE; One Step Plus + Duolink/Bisco; Excite + Variolink I/Ivoclar Vivadent) and self-adhesive cementation-experimental groups (Rely X Unicem/3M ESPE; Biscem/Bisco; MultiLink Sprint/Ivoclar Vivadent). Each group was subdivided according to the dentin approach to: α, maintenance of collagen fibers and β, deproteinization. The mean values were obtained, and submitted to ANOVA and Tukey test. Statistical differences were obtained to the RelyX Unicem groups (α = 13.59 MPa; β = 30.19 MPa). All the BIS Group specimens failed before the mechanical tests. Dentinal deproteinization provided an improved bond performance for the self-adhesive cement Rely X Unicem, and had no negative effect on the other cementing systems studied.     

栓道预处理对自粘接树脂水门汀粘接纤维桩粘接强度的影响

BACKGROUND: The bonding interface of resin cements with dentin is unstables, therefore, improvement on the bonding strength is of great significance. OBJECTIVE: To evaluate the effects of different pretreatments to post space on bonding strength of the self-adhesive resin cement EmbraceCoreTM Resin Cement to fiber posts after phosphoric acid etching or self-etching. METHODS:Twenty-five human mandible canines or premolars with single-rooted canal were selected. After conventional root canal treatment and post space preparation, they were randomly divided into five groups (n=5 per group): group I (control group): 0.9% normal saline irrigation; group II: etching with 35% phosphoric acid for 15 seconds; group III: self-etching with CLEARFILTM SE BOND binder for 20 seconds; group IV: etching with 35% phosphoric acid for 15 seconds and bonding with single bong 2; group V: self-etching with CLEARFILTM SE BOND binder for 20 seconds and bonding with CLEARFILTM SE BOND binder. Fiber posts were edusing self-adhesive resin cement EmbraceCoreTM Resin Cement. The thin-slice push-out test was performed to record the bonding strengths, and the failure modes of fiber posts were observed by stereomicroscope. RESULTS AND CONCLUSION: The bond strength of groups I-V were as follows: (8.66±2.43), (7.05±3.0), (7.37±2.83), (9.88±2.9), and (10.04±2.86) MPa. Groups II, IV and V showed significantly different bond strength from the group I (P < 0.05), but there were no significant differences between groups III and I (P > 0.05). The main failure models in the groups I, II and III were A1 and A2, and less B1 and B2 appeared. The failure modes in the groups IV and V also focused on the A1 and A2, but B1 and B2 increased gradually. These results indicate that neither the pretreatments by phosphoric acid etching nor by self-etching in root canal dentin can improve the bonding strength of EmbraceCoreTM Resin Cement to fiber posts, but the use of binder relative to phosphoric acid etching or self-ctching is helpful.      

不同树脂黏结剂对纤维桩冠向微渗漏及黏结强度的影响

背景：目前国内外对全酸蚀、自酸蚀及自黏结树脂黏结剂对纤维桩的冠向微渗漏及黏结强度影响的研究仍存在差异。 目的：评价全酸蚀、自酸蚀及自黏结3种树脂黏结剂对纤维桩黏固后冠向微渗漏及黏结强度影响。 方法：将32颗人离体上前牙随机分成5组,其中3组为实验组,2组为对照组。实验组离体牙经根管预备后,选用全酸蚀、自酸蚀及自黏结3种树脂黏结剂分别黏结直径为1.4 mm的玻璃纤维桩。体视显微镜下观察试件各剖面的微渗漏情况,再将实验组试件沿垂直牙长轴方向切成厚度为2 mm的薄片,万能材料测试机进行微推出实验,并观察试件断裂方式。阳性对照组不进行根管预备,根部涂布指甲油,冠部直接暴露于染色剂中;阴性对照组不进行根管预备,树脂覆盖根管口,将牙体整体涂布指甲油后黏蜡包埋至截面下1 mm。 结果与结论：各种树脂黏结剂均存在微渗漏现象,其中全酸蚀树脂黏结剂的微渗漏程度最轻,自酸蚀树脂黏结剂的微渗漏程度最重。3种树脂黏结剂间的微渗漏程度差异有显著性意义(P < 0.05)。黏结剂间的黏结强度由高到低分别为全酸蚀树脂黏结剂、自酸蚀树脂黏结剂、自黏结树脂黏结剂,3种黏结剂的黏结强度差异有显著性意义(P < 0.05)。试件的主要断裂方式为黏结剂/纤维桩间断裂及混合破坏。说明全酸蚀树脂黏结剂与牙本质结合紧密,与自酸蚀树脂黏结剂、自黏结树脂黏结剂比较在微渗漏程度及黏结性能方面显示出优越性。     

Effect of temporary filling materials on repair bond strengths of composite resins

Endodontic access cavities sometimes can be prepared through a permanent composite restoration. Between the appointments, temporary cements are used to seal access cavities and may have negative effect on bonding of further composite restoration. The purpose of this study was to compare shear bond strength of composite to composite which had been in contact with various temporary filling materials. Standard cavities were prepared on 160 acrylic resin blocks, obturated with composite resin (Clearfil AP-X, Kuraray, Japan) and randomly divided into eight groups (n = 20). Group 1 received no treatment. From group 2-8, composite surfaces were covered with the following cements temporarily: Zinc-oxide/calcium-sulphate (Cavit-G, ESPE, Germany), two different Zinc-Oxide-Eugenol materials (ZnOE, Cavex, Holland and IRM, Dentsply, USA), Zinc-phosphate cement (Adhesor, Spofa-Dental, Germany), Zinc-polycarboxylate cement (Adhesor-Carbofine, Spofa-Dental, Germany), Glass-Ionomer-Cement (Argion-Molar, Voco, Germany), or light curing temporary material (Clip, Voco, Germany). The cements were removed mechanically after 1 week storage in distilled water at 37 degrees C and composite surfaces were treated with a self-etch adhesive system (SE-Bond, Kuraray, Japan). Composite resin build-ups were created on composite surfaces. Shear bond strength values were measured using universal testing machine at crosshead speed of 1 mm/min. The data was calculated in MPa and statistically analyzed using one-way ANOVA and Tukey tests. Eugenol-containing cements significantly reduced shear bond strengths of composite to composite (p < 0.05), while the other temporary materials had no adverse effect on shear bond strength (p > 0.05). These findings suggested that temporary filling materials except eugenol-containing materials have no negative effect on composite repair bond strengths.     

Comparison of regional bond strength in root thirds among fiber-reinforced posts luted with different cements

AIM: To compare regional bond strength in different thirds of the root canal, among glass fiber-reinforced (FRC) endodontic posts luted with different cements, using the push-out test. MATERIAL AND METHODS: Sixty extracted human anterior teeth were endodontically treated with gutta-percha and AH Plus sealer. The crown portion was removed, and a dowel space was prepared. Prepared teeth were randomly assigned to one of six groups (n = 10) for luting glass FRC Postec posts, with one of the six cement systems (Ketac Cem Aplicap, Relyx Unicem Aplicap, Variolink II/Excite DCS, Panavia F/ED Primer, C&B cement/All-Bond 2, and Multilink/Multilink Primer A/B), using an alignment technique. Specimens were embedded in resin, and each root was sectioned into six 1-mm thick serial slices. A push-out test was performed to measure regional bond strengths and to identify the type of failure. RESULTS: The highest bond strength values were found in the cervical third and the lowest in the apical third. Highest values were obtained using Variolink II, Panavia F, and Multilink resin cements followed by C&B resin cement and Relyx Unicem ionomer resin cement; Ketac-cem ionomer cement showed the lowest value. CONCLUSION: Highest bond strength values were obtained in the cervical third and with resin cements.     

Effect of surface treatment on the shear bond strength of three resin cements to a machinable feldspatic ceramic

The aim of this study was to evaluate the shear bond strength of three resin cements to Vita Mark II ceramics under different pretreatments of the ceramic surface and to examine whether simplified pretreatment procedures would result in satisfying results compared to the state of the art. RelyX Unicem (RXU), Calibra (CAL), and Variolink II (VAR) were used as resin cements and bonded to machine milled feldspatic disks, pretreated in five different ways. (1) no pretreatment of the ceramic surface; (2) surface etched with hydrofluoric acid (HF); (3) ceramic surface silanized; (4) ceramic surface etched (HF) and silanized, (5) ceramic surface etched (HF), silanized, and covered with Heliobond. The shear bond strengths were measured initially, after 5000 and 10,000 thermocycles (TC). After 10,000 TC for CAL only procedure 5 resulted in a reliable adhesion median value of 10.7 MPa. VAR showed median values of 24.6, 17.2, and 18.1 MPa for pretreatments 5, 3, and 4, respectively. RXU performed 25.9, 22.0, and 11.0 MPa for procedures 5, 4, and 3, respectively. For procedure 2, RXU revealed the significantly highest value with 15.4 MPa (U-test, p = 0.05). Only RXU-luted specimens of procedure 1 survived the 10,000 thermocycles. The results revealed that a simplification of the ceramic pretreatment for VAR and RXU might be possible.     

Adhesion of a quartz fibre post to a composite resin core: influence of bonding agents and their curing mode

Fibre-reinforced composite posts are currently used to restore endodontically-treated teeth. Push-out tests were carried out to evaluate the performance of several bonding agents on the retention of an endodontic quartz fibre post to a composite resin core. Five bonding agents were investigated in both self-cure and light-cure modes. Ten experimental groups of 10 posts each were constituted as a function of curing mode and bonding agent. Specimens were mounted in a dedicated Teflon mould. This experimental set-up allowed the determination of true shear strength. One-way ANOVA and Student–Newman–Keuls tests were used for statistical analysis. The bonding strengths ranged from 23.4 MPa to 35.3 MPa. The best results were obtained with a light-cure self-etch bonding agent; in all cases photo-polymerisation led to statistically higher bonding strengths compared to chemical auto-polymerisation. Shear bond strength at the post–adhesive interface was also found to be significantly dependant on the nature of the bonding agent. AdheSe self-etch bonding agent was more effective than etch-and-rinse single-component bonding agents.     

Effect of cyclic loading on bonding of fiber posts to root canal dentin

This study evaluated the effect of mechanical loading on microtensile bond strength (MTBS) when luting fiber posts to root canal dentin. Forty maxillary premolars were endodontically treated, and the roots were prepared for post cementation using the FRC Postec system. A light-cured composite (Clearfil Photo Core, Kuraray) was used in combination with four adhesive systems: Single Bond (3M ESPE), Multilink Primer (Vivadent), Clearfil Photo Bond (Kuraray), and Clearfil New Bond (Kuraray). A composite build-up was performed around the root to provide adequate gripping during testing. For each experimental group, half of the specimens were load cycled under 90 N (5000 cycles, 3 cycles/s). Specimens were cut to obtain beams with the post in the center and with the radicular dentin overlaid by the composite build-up on each side. Microtensile testing was performed with a universal testing machine at a cross-head speed of 0.5 mm/min. The failure mode was classified under a stereomicroscope. ANOVA and Student-Newman-Keuls multiple comparison tests were performed. After 24 h, all adhesives performed similarly. When specimens were subjected to mechanical loading, decreases in MTBS were observed for Clearfil New Bond and Multilink Primer.