纳米金刚石改性核树脂与纤维桩的微拉伸粘结强度研究

目的：测试自行合成的纳米金刚石改性的核树脂（UFD-C）与三种材料纤维桩的微拉伸粘结强度.方法：选择石英纤维桩、玻璃纤维桩、碳纤维桩各10个,每种随机分成2组.在桩周分别用UFD-C或Luxa-Core（L-C）商品核树脂充填,用低速锯沿纤维桩外周平行片切,再垂直粘结面片切成约0.9mm×0.9mm的长方形柱状试件,每组共15个试件.测试其粘结强度,并观察其断裂类型.结果：UFD-C与三种纤维桩的微拉伸粘结强度分别为20.08±2.79 MPa、17.78±5.70 MPa、20.12±3.78 MPa;L-C与三种纤维桩的微拉伸粘结强度分别为21.09±3.64 MPa、23.55±3.41 MPa、18.12±3.80 MPa.L-C与玻璃纤维桩的微拉伸粘结强度高于UFD-C与玻璃纤维桩,差异有统计学意义（P＜0.05）,2种核树脂与石英纤维桩和碳纤维桩的粘结强度差异无显著性（P＞0.05）.体视显微镜观察92%试件是粘结界面的断裂.结论：纳米金刚石改性核树脂与石英纤维桩、碳纤维桩的微拉伸粘结强度与商品Luxa-Core核树脂相当,能满足牙体缺损修复的要求.     

粘结剂类型对核树脂与牙本质的微拉伸粘结强度的影响

目的测试不同的粘结剂类型对核树脂与牙本质的粘结强度的影响,为临床选择合适的粘结剂和核树脂提供参考。方法选择20颗因阻生拔除的健康第三磨牙,磨除牙合面釉质,形成牙本质平面。随机分成ABCD四组,每组5颗牙齿。A组、B组所有牙本质粘结面涂布自酸蚀Contax粘结剂。C组和D组牙本质粘结面酸蚀剂处理后涂布SingleBond粘结剂,A组和C组用Luxa-Core核树脂,B组和D组用3MFiltekTMZ350纳米树脂进行分层固化粘结,切成约0.9mm×0.9mm的柱状试件,每组共30个试件。用微拉伸测试仪检测其粘接强度,用扫描电镜观察样本粘接界面的超微形态。结果 A组（36.03±9.25）MPa和B组（23.38±9.78）MPa与C组（14.27±8.63）MPa相比,差异有统计学意义（P〈0.05）,D组（38.80±10.56）MPa与B组、C组相比,差异有统计学意义（P〈0.05）,A组和D组相比,差异无统计学意义（P〉0.05）。两种核树脂的粘结界面均可见牙本质小管有树脂突形成,SingleBond酸蚀组树脂突比Contax自酸蚀组分布密度较密,长度较长。结论不同的粘结剂类型对核材料与牙本质的粘结强度有影响,要选择核树脂配套的粘结剂。     

几种粘结树脂在粘结失败后的不同牙本质界面进行再粘结的微拉伸粘结强度和形态学观察

目的:研究3种不同树脂在粘结失败后的不同牙本质表面粘结的微拉伸粘结强度及形态学的观察.方法:磨除因正畸拔除的前磨(牙合)面牙釉质暴露中层牙本质,用Single Bond 2进行粘结建立再粘结模型.在打磨机上打磨再粘结模型样本,产生含有混合层的牙本质表面和去除混合层的牙本质表面.用3种粘结树脂分别在正常牙本质表面,含有混合层的牙本质表面和去除混合层的牙本质表面进行粘结.Z250树脂充填.在低速锯下切割样本进行微拉伸测试(μTBS)和扫描电镜观察粘结界面及断裂类型.结果:每种树脂在含有混合层的牙本质表面粘结的μTBS数值及所产生的混合曾的厚度显著低于在正常牙本质表面粘结的数值.而且较正常牙本质产生较多的玷污颗粒.结论:本实验表明混合层及树脂玷污层的存在降低了在牙本质表面进行再粘结的粘结强度.     

干燥或润湿表面对牙本质湿粘结强度影响的微拉伸强度研究

目的：研究牙本质表面的干燥或润湿状态对牙本质湿粘结强度的影响。方法：测试和比较5种牙本质湿粘结系统在干燥或润湿的牙本质表面粘结时的微拉伸强度。结果：干燥粘结时5种粘结剂的微拉伸粘结强度均比湿粘结时有显下降，以丙酮为溶剂的粘结系统粘结强度的下降幅度，大于以酒精和水为溶剂的粘结系统。结论：在使用牙本质湿粘结系统时，保持牙本质表面的润湿状态，可以获得较高的粘结强度。     

五种牙本质粘结系统微拉伸强度的比较

目的比较不同类型自酸蚀牙本质粘结系统的粘结强度,为临床应用提供参考。方法选择4种自酸蚀粘结系统Clearfil S3Bond,i Bond,Clearfil SE Bond,XenoⅢ,1种全酸蚀粘结系统Single Bond2,用微拉伸法测试这些粘结系统的粘结强度并进行比较。结果全酸蚀粘结剂Single Bond2的微拉伸强度最高,与自酸蚀粘结剂粘结强度有显著差异（P〈0.05）。自酸蚀粘结剂i Bond,S3Bond,XenoⅢ两两之间粘结强度无显著差异（P〉0.05）。SE Bond的粘结强度显著高于i Bond,S3Bond和XenoⅢ（P〈0.05）。结论第五代牙本质粘结剂具有较强的粘结强度,但第七代牙本质粘结剂临床操作更为方便。     

模拟髓室压力对中层牙本质树脂微拉伸粘结强度的影响

目的评价髓室压力对中层牙本质树脂粘结强度的影响。方法32颗第三磨牙随机分组,实验组以15cm水柱模拟髓室压力。Clearfil S~3 Bond粘结剂作树脂光固化后微拉伸力学测试。结果实验组粘结剂应用时间为300 s时,微拉伸粘结强度明显下降。实验组和对照组相比较,150 s组和300 s组的微拉伸粘结强度差异均有统计学意义。结论模拟髓室压力会影响中层牙本质树脂微拉伸粘结强度。     

不同涂布方式对牙本质粘结微拉伸强度的影响

目的:观察不同涂布方式对4种牙本质粘结剂牙本质微拉伸粘结强度的影响。方法:选择80个离体前磨牙制备牙本质粘结面后,随机分为16组,每组5个,分别以轻涂(G)、重涂(V)、涂1层(1)、涂2层(2)等不同方式涂布牙本质粘结剂,并修复树脂"冠"。CMT7104型万能材料测试机测试各组试件的微拉伸强度。结果:不同涂布方式下4种牙本质粘结剂的微拉伸粘结强度依次是G2组>V2组>V1组>G1组;G2组明显高于其他3组(P<0.05);V1组和G1组间、V1和V2无明显统计学差异(P>0.05)。结论:不同涂布方式对牙本质粘结剂微拉伸强度具有一定的影响,轻涂2遍(G2)获得的微拉伸强度最高。     

牙本质粘结剂的微拉伸强度测试

牙本质粘结剂微拉伸强度测试是近年来发展起来的一种新型测试方法和技术,较传统的剪切强度测试有许多独特优点。本文就微拉伸法的基本测试方法、特点、影响因素及体外临床粘结研究等问题进行综述。     

湿度对"单瓶"牙本质粘结系统微拉伸粘结强度的影响

目的用微拉伸强度检测法评价脱矿牙本质表面的不同"湿度"状态对酒精/水基和丙酮基"单瓶"牙本质粘结系统粘结强度的影响.方法选择40颗健康前磨牙,去除牙合面釉质,随机均分为8个实验组,在过湿、用滤纸吸干、用空气干燥1 s或用空气干燥30 s的脱矿牙本质上分别应用Single Bond或Prime&Bond NT单瓶牙本质粘结系统.将牙齿片切为粘结面积约0.9 mm×0.9 mm的长方体状样本,进行微拉伸粘结强度检测,对结果进行统计学分析.结果对于同一种粘结系统,其吸干组和1 s干燥组间的微拉伸粘结强度值无统计学差异,但均显著高于过湿组和30 s干燥组.结论脱矿牙本质表面的湿度对酒精/水基和丙酮基"单瓶"牙本质粘结系统的粘结强度有极大的影响.     

树脂微拉伸粘结强度测试法的影响因素

目前常用微拉伸强度测试法对树脂的粘结强度进行评估。微拉伸强度测试法较传统的剪切强度测试有许多独特优点,然而该测试法会受到诸多因素的影响,使之不能准确反映树脂与牙体组织之间的粘结强度。这些影响因素主要包括离体牙储存方式、样本预备、不同的粘结系统以及固化方式等,已有学者对其进行了相关研究,该文就其研究成果作一综述。     

离体牙储存方式对牙本质黏结剂微拉伸强度的影响

目的：对比研究不同的离体牙储存方法和时间对牙本质黏结剂Single Bond微拉伸强度的影响。方法：选用30颗因正畸拔除的第一前磨牙,随机分为5组。拔除后立即分别放人4℃的0．02％麝香草酚水溶液、10％甲醛溶液、1％氯胺溶液、蒸馏水中储存,以及用湿纱布包裹-20℃冰箱中储存。分别在储存的第10天、90天取出,在牙冠殆面表层牙本质上使用牙本质黏结剂Single Bond,复合树脂Z250黏结修复,测定牙本质黏结剂的微拉伸强度值。选用新鲜拔除的前磨牙作为对照组。用体视显微镜和扫描电子显微镜观察微拉伸强度测试样本的断裂类型。用SPSS11．5软件对牙本质黏结剂的微拉伸强度值做双因素方差分析。结果：不同的储存方法对牙本质黏结剂微拉伸强度有显著影响(P=0．01),与新鲜拔除的牙比较,蒸馏水中4℃储存(P=0．024)和0．02％麝香草酚水溶液4℃储存(P=0．008)的离体牙的微拉伸强度显著降低;不同的储存时间对牙本质黏结剂的微拉伸强度影响无统计学差异(P=0．279)。所有微拉伸强度测试样本的断裂均发生在黏结界面。结论：离体牙储存方法对牙本质黏结剂Single Bond的黏结强度有重要影响,建议使用离体牙评价牙本质黏结剂的黏结强度时,选用新鲜拔除的牙、-20℃冷冻的牙或1％氯胺溶液4℃储存的牙,以减小不必要的实验误差。     

The influence of the cutting speed on bond strength and integrity of microtensile specimens

OBJECTIVES: To verify the influence of cutting speed during microtensile specimen preparation, on bond strength values and on the sample microscopic integrity of a single-bottle adhesive system to enamel and dentin. METHODS: Thirty sound human third molars were restored with light-cured Excite and Tetric Ceram according to manufacturers' instructions, being half in ground enamel [E], and half in flat dentin [D]. After 24 h storage in distilled water at 37 degrees C, the restored teeth were sectioned in x and y-axes under different cutting speed: 100, 200 or 400 RPM, obtaining stick shaped specimens with cross-sectional area of 1.0 mm(2). Five specimens from each experimental group were randomly selected before being loaded for SEM analysis, while the remaining samples were subjected to the microtensile bond strength test. Because the variance of dentin specimens was significantly higher than the variance of enamel samples, analysis of the influence of the cutting speed was performed separately, by substrate. RESULTS: The mean values in MPa were calculated including/excluding premature failures: E1: 24.67/27.31(a); E2: 24.03/25.81(a); E4: 19.06/21.52(b); D1: 35.80/36.33(A); D2: 35.84/36.65(A); D4: 37.78/38.50(A). In the SEM analysis, better integrity of the dentin specimens was observed when compared to the enamel samples, for which the integrity was greater in the lower cutting speed groups. SIGNIFICANCE: It can be concluded that the cutting speed is an important factor that should be considered, mainly when enamel is involved, since it may affect the bond strength results and the integrity of the specimens.     

Effect of fluoride iontophoresis on the microtensile bond strength between dentin and two adhesive systems

AIM: To evaluate the effect of fluoride iontophoresis on the microtensile bond strength (MTBS) between coronal dentin and two resin-based adhesive systems, and to measure quantitatively dentinal tubule occlusion. METHODS: Twelve freshly extracted intact human mandibular third molars were divided randomly into four groups. The superficial occlusal dentin of each tooth was exposed and treated. Group A1: One-Step Plus total-etch adhesive system; group A2: One-Step Plus total-etch adhesive system after fluoride iontophoresis; group B1: ACE BOND SE self-etching adhesive system; group B2: ACE BOND SE self-etching adhesive system after fluoride iontophoresis. A resin composite buildup was made for each tooth, which was then sectioned along its long axis to produce 10 beams (1.0mmx1.0mm) for the microtensile bond strength (MTBS) test. Five dentin disks were cut in half and their occlusal surfaces etched with 6% citric acid. The test halves were treated with fluoride iontophoresis. Four SEM photomicrographs were taken from corresponding sites on each test and each non-treated control half-disk. Image-Pro Plus 4 software quantified the percentage of tubule occlusion. Data were analyzed using one-way ANOVA, chi(2)- and t-tests, with the probability level set at alpha=0.05. RESULTS: The mean MTBS (MPa) for each group was, A1: 30.86 (S.D. 6.84); A2: 25.04 (8.49); B1: 19.22 (6.88); B2: 19.40 (6.92). There were significant differences among all groups (P相似文献   

2种自制牙本质粘接剂的微拉伸粘接强度和耐久性能的实验研究

目的 测试自行研制的自酸蚀及全酸蚀粘接剂的微拉伸粘接强度和耐久性能,并与市售的进口同类产品进行对比.方法 选用正畸拔除前磨牙60颗,随机分成4组,每组分循环前、后各2个亚组,各15个试件,分别为自制的自酸蚀粘接剂(44组)和全酸蚀粘接剂(45组),Easy one(EO组)和Single Bond2(SB组).测试各组冷热循环前后的微拉伸粘接强度变化,并进行统计分析,体视显微镜观察断裂模式.结果 冷热循环前,各组微拉伸粘接强度从大到小分别为SB组(35.05±3.01)Mpa＞44组(27.76±1.44)Mpa＞ 45组(27.65±1.67)Mpa＞EO组(26.03±2.15)Mpa,45组和SB组之间及44组和EO组之间微拉伸粘接强度的差异有统计学意义(P＜0.05).冷热循环后,各组从大到小为SB组＞44组＞EO组＞45组,45组和SB组之间及44组和EO组之间微拉伸粘接强度的差异有统计学意义(P＜0.05).同一粘接剂冷热循环前后相比,粘接强度均呈下降趋势(P＜0.05);试件的断裂面类型以混合型断裂为主.结论 自制牙本质粘接剂和市售的进口同类产品相比,自酸蚀粘接剂粘接强度高且耐久性能好,全酸蚀粘接剂则与之相反.冷热循环后各组粘接剂的微拉伸粘接强度均有下降.     

复合树脂直接与间接修复的粘接微拉伸强度测试研究

目的对复合树脂直接与间接修复的粘接微拉伸强度进行测试。方法新鲜拔除的完好无龋、人下颌第三磨牙15颗,随机分成3组,用Isomet低速切割机流水冲洗下磨去咬合面釉质,暴露牙本质,A组为Renew树脂用One Step Plus直接粘接在牙本质面上,B组为预成的Renew树脂＂冠＂用One Step Plus和C＆B cement间接粘接修复,C组为预成的Renew树脂＂冠＂用One Step Plus和Duo-link间接粘接修复,贮存于室温水中24h,测试微拉伸强度,检查断裂界面。结果A组微拉伸强度（33.38±6.24）MPa高于B组（20.06±4.96）MPa和C组（21.08±4.60）MPa,且差异有显著性,BC两组的微拉伸强度无统计差异。结论树脂直接充填粘接的微拉伸强度要高于树脂间接修复。     

Effect of saliva contamination on bond strength of resin luting cements to dentin

Objectives

This study examined the effect of saliva contamination on the microtensile bond strength (μTBS) of resin luting cements to dentin.

Methods

For RelyX ARC (ARC, 3M ESPE), dentin surfaces were etched with 32% phosphoric acid. The subgroups were: ARC-control (uncontaminated), ARC-I (saliva contamination, blot-dried), ARC-II (saliva contamination, rinse, blot-dried) and ARC-III (saliva contamination, rinse, re-etch, rinse, blot-dried). For Panavia F 2.0 (PF, Kuraray), the subgroups were: PF-control (uncontaminated), PF-I (saliva contamination, dried), PF-II (saliva contamination, rinse, dried), PF-III (primer, saliva contamination, dried), PF-IV (primer, saliva contamination, dried, primer re-applied) and PF-V (primer, saliva contamination, rinse, dried, primer re-applied). Composite blocks were luted onto dentin using the two cements. Bonded specimens were sectioned into 0.9 mm × 0.9 mm beams for μTBS testing. Representative fractured beams were prepared for fractographic analysis.

Results

For ARC, salivary contamination of etched dentin (ARC-I) significantly lowered bond strength (p = 0.001). Rinsing saliva off with water (ARC-II) restored bond strength to control level. Re-etching dentin surface after rinsing (ARC-III) resulted in the lowest bond strength (p < 0.001). For PF, salivary contamination of dentin before (PF-I) and after application of primer (PF-III and PF-IV) significantly lowered bond strength (p < 0.001). Rinsing saliva off with water and re-application of primer (PF-II and PF-V) improved bond strength.

Conclusion

Saliva contamination during luting deteriorated the bond quality of resin cements. Decontamination by rinsing with water was most effective in restoring the bond strength of RelyX ARC. Decontamination by water-rinsing and primer re-application after rinsing improved the bond strength of Panavia F 2.0.     

三种分层充填方法对牙本质黏结强度的影响

目的:对比研究3种分层充填方法对牙本质黏结的微拉伸强度的影响。方法:选取因正畸需要拔除的前磨牙15个,随机分为3组。去除面釉质,暴露平的牙本质表面,在其中央制备3.5mm×3.5mm×3mm的盒形洞。使用Single Bond黏结剂,按使用说明进行牙本质黏结,用Z100复合树脂充填窝洞:A组:分3层水平充填;B组:分3层斜向充填(第一层水平充填,第二、三层近远中向斜向充填);C组:分3层斜向充填(第一、二层近远中向斜向充填,;第三层水平充填)。用硬组织切片机将实验牙切成黏结面积约0.9mm×0.9mm的正方形小条作为试件,用以测试牙本质微拉伸黏结强度。在体视显微镜和扫描电镜下观察样本的断裂界面。结果:C组的微拉伸黏结强度测试值(31.99±5.27)高于A组(24.56±4.90)和B组(31.19±3.90),3种分层充填方法对牙本质微拉伸黏结强度的影响有统计学意义(P<0.05)。体视显微镜和扫描电镜下观察测试样本的断裂多数为黏结界面破坏。结论:3种分层充填方法对牙本质黏结的微拉伸强度存在影响,其中C组的分层充填方法略优于另外两组。因此,在修复较深的牙体缺损时,采用合适的分层充填方法有利于获得良好的黏结效果。