牙本质的表面状态对黏接剂粘接强度的影响

目的研究3种不同的表面状态对两种牙本质黏接剂的粘接强度的影响。方法选用两种牙本质粘接系统SingleBond(SB)和Prime&BondNT(PB),分别应用于干燥、湿润和过湿的离体的人牙本质表面,用Z-100树脂恢复牙冠至4mm。用低速锯片切牙齿,精细金刚砂车针修成沙漏状的粘接面积约0.8mm2的样本,测试各个样本的微拉伸粘接强度。结果两种黏接剂在湿润状态下的粘接强度均高于干燥组和过湿组(P<0.05),干燥组与过湿组的差异无显著性。在3种表面状态下,SB的粘接强度均高于PB组(P<0.05)。结论在使用全酸蚀单瓶粘接系统时,牙本质表面必须保持适度的湿润。     

两种不同固化处理的复合树脂黏接微拉伸强度测试研究

目的　对不同固化处理的复合树脂黏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,用Renew树脂直接充填、Renew树脂间接修复、Tescera树脂间接修复制作树脂“冠”并黏接在牙本质面上,贮存于室温水中2 4h ,测试微拉伸强度。结果　Renew树脂直接充填组(33.38±6 .2 4 )MPa的微拉伸强度高于Renew间接修复组(2 0 .0 6±4 .96 )MPa和Tescera间接修复组(2 0 .87±4 .6 2 )MPa ,差异有显著性(P <0 .0 5 ) ,后两者之间差异无显著性。结论　树脂直接充填的微拉伸强度要高于树脂间接修复。     

表面状态对乙醇-水基黏接剂强度和界面的影响

目的　研究干燥或湿润的牙本质表面状态对乙醇 -水基黏接剂黏接强度与黏接界面微观结构的影响 ,探讨黏接强度与黏接界面微观结构之间的内在联系。方法　选用两种含有乙醇和水的湿黏接系统OptiBondSolo和SingleBond ,将Chrisma树脂分别黏结在干燥或湿润的人牙本质表面 ,测试各组试件的微拉伸强度 ,并在扫描电镜下观察和比较各组试件黏接界面超微结构的异同。结果　湿黏接时黏接剂对牙本质表面的渗透较为充分 ,混合层均匀 ,厚度为 4～ 5 μm ,并可观察到牙本质小管和侧支小管中均有明显的树脂突形成 ;干燥黏结时形成的界面形态与湿黏接时没有明显区别。干燥黏接时 ,两种黏接系统的微拉伸强度均降低 ,下降幅度最高为 2 3% ,微拉伸破坏的方式主要是黏接界面的破坏。结论　微拉伸强度测试可客观反映黏接强度的大小     

光照强度对牙本质湿粘接微拉伸强度的影响

目的：探讨光照强度对牙本质湿粘接微拉伸强度的影响。方法：用WDW-100型电子万能试验机测试和比较粘接剂在不同强度光照后的微拉伸强度。结果：采用300mW/cm^2的光照强度。所得的微拉伸强度明显高于采用500mW/cm^2和800mW/cm^2固化的微拉伸强度;采用500mW/cm^2固化的微拉伸强度又明显高于采用800mW/cm^2固化的微拉伸强度。结论：较弱的光照强度能提高光固化树脂与牙本质之间的湿粘接微拉伸强度,提示采用较弱的光照强度对提高复合树脂与牙本质间的结合有积极作用。     

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。     

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。     

牙本质表面处理因素对树脂黏接剂黏接力的影响

黏接力是固定修复体固位力的重要组成部分,为提高黏接强度,树脂黏接剂越来越多的应用于临床。不同的牙本质表面处理因素,比如酸蚀、脱敏、暂时粘固剂的应用等会对黏接强度造成不同的影响,该文仅就此做一综述。?     

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。     

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。     

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。     

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。     

树脂粘结剂与瓷表面处理对全瓷粘结微拉伸强度的影响

目的 研究3种树脂粘结剂配合2种瓷表面处理方法对全瓷粘结微拉伸强度的影响.方法 制作60个体积为5mm×6mm×8mm瓷试件(Empress Ⅱ),抛光后分成两组:对照组和HF SIL组(5%氢氟酸酸蚀20秒,硅烷处理1分钟).分别采用3种树脂粘结剂(RelyX Unicem, Variolink或Panavia F)与复合树脂粘结,37℃保存7天,切割成接触面积为1.0mm2的75个柱形体.试件经热循环(5℃～55℃循环3000次)后,测量粘结微拉伸强度(uTBS).结果 表面处理因素有重要意义(HF SIL组>对照组).对照组中Rely X Unicem的uTBS明显高于Variolink和Panavia F.HF SIL组中经RelyX Unicem和Variolink的uTBS明显高于Panavia F.结论 无论使用何种树脂粘结剂,在粘结前进行酸蚀和硅烷处理都是必要的.     

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。     

Effect of 2% chlorhexidine on dentin microtensile bond strengths and nanoleakage of luting cements

Objectives

The aim of this study was to investigate the effect of pre-treatment by chlorhexidine on the microtensile bond strength (mTBS) of resin cements and nanoleakage at the resin–dentine interfaces.

Methods

Cylindrical composite blocks were luted to human dentine using resin cements (RelyX ARC, 3M ESPE: ARC; Panavia F, Kuraray Medical Inc.: PF; RelyX Unicem, 3M ESPE: UN) with/without pre-treatment by 2% chlorhexidine digluconate (CAVITY CLEANSER, Bisco, Inc., Schaumburg, IL, USA). CAVITY CLEANSER was applied on the acid etched dentine for 60 s in the ARC group, and on smear layer-covered dentine in the PF and UN groups. After storage in water for 24 h, the bonded teeth were sectioned into 1 mm thick slabs and further into 0.9 mm × 0.9 mm beams. After immersion in water or ammoniacal silver nitrate for 24 h, the beams were stressed to failure in tension. The fractured surfaces were examined by field-emission scanning electron microscopy (FE-SEM) using backscattered electron mode. The silver-stained slabs were used to examine nanoleakage within the bonded interface by FE-SEM.

Results

The resin cement and chlorhexidine treatment had significant effects (p < 0.0001) on mTBS; while the storage media had no significant effect (p = 0.435). The mTBS of ARC was significantly higher than the other cements. Chlorhexidine reduced mTBS and produced pronounced nanoleakage when PF and UC were luted to dentine.

Conclusions

Pre-treatment with chlorhexidine affected the integrity of dentine bonding with PF and UC, while there was no adverse effect on coupling of ARC.     

The effect of warm air-blowing on the microtensile bond strength of one-step self-etch adhesives to root canal dentin

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.

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.     

Shear bond strengths of tooth fragments reattached or restored

This study investigated the shear bond strengths of sectioned human mandibular incisor edge fragments reattached using luting cements, bonding agents or restored with composite resins. Seventy teeth were randomly distributed among six experimental groups and a control group. Leaving half of the anatomic crowns exposed, the teeth were embedded in self-cure acrylic resins with the exposed part then sectioned. The fragments in groups 1-4 were bonded to their respective teeth using Clearfil Liner Bond 2V, Scotch Bond Multi Purpose Plus, Panavia-F and 3M Opal Luting cement. The 5th and 6th groups were restored with composite resins (Silux 3M and Clearfil AP-X) using their bonding agents (Single Bond and Clearfil SE Bond). The results indicated that reattachment of fractured incisal fragments by using new generation bonding agents was effective against shear stresses, comparable with the intact teeth. Instead of restoration with composite resins therefore reattachment of a fractured fragment might be more preferable in cases of dental trauma.     

纳米金刚石改性核树脂与牙本质的微拉伸粘结强度的研究

目的 检测纳米金刚石填料改性的自行合成的核树脂与牙本质的微拉伸粘结强度.方法 选择10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2组,每组5颗牙齿.采用自行合成的纳米金刚石填料改性的核树脂(UFD-C)和Luxa-Core(L-C)商品核树脂充填并分别粘结于牙本质面上,形成4mm～5mm高的树脂层.将牙齿及上方的粘结树脂样本平行于牙长轴片切成约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结强度,体视显微镜观察其断裂类型,用扫描电镜观察样本粘结界面和断面的超微形态.结果 UFD-C组与牙本质的微拉伸粘结强度均值为:(36.03±9.25)MPa,L-C组与牙本质的微拉伸粘结强度均值为:(36.80±10.56)MPa,两组的粘结强度差异无显著性.UFD-C组70%为粘结面断裂,L-C组80%为粘结面断裂.扫描电镜显示两种核树脂的粘结界面均有树脂突形成.结论 自行合成的纳米金刚石改性核树脂(UFD-C)与Luxa-Core核树脂(L-C)的微拉伸粘结强度差异无显著性,能达到牙体缺损粘结修复的要求.