不同表面粒度车针预备所致玷污层对牙本质粘结强度的影响

目的：比较两种不同表面粒度的金刚砂车针进行牙体预备后对牙本质粘结强度的影响。方法：采用两种金刚砂车针与碳化硅砂纸对牙本质表面进行打磨预备后，分别选用全酸蚀粘结剂Single Bond及自酸蚀粘结剂iBond与树脂粘结，用慢速切割机片切牙齿，精细金刚砂车针修成沙漏状的粘接面积约0．8mm^2的样本，测试各个样本的微拉伸粘结强度。结果：全酸蚀粘结条件下，3组样本的粘结强度无显著差异，而在应用自酸蚀粘结剂时，粗粒度车针预备后的牙本质粘结强度明显低于经极细粒度车针或是碳化硅砂纸处理组（P〈0．05）。结论：采用极细粒度车针进行牙体预备可以有效增强牙本质与自酸蚀粘结剂间粘结强度。     

空气喷磨对乳牙树脂充填微渗漏的影响

目的:体外评价空气喷磨备洞与常规车针备洞对乳牙树脂充填微渗漏的影响.方法:对照组(Ⅰ,n=12)人离体乳磨牙常规备洞,其余组分别用27μm(Ⅱ,n=12)和50μm(Ⅲ,n=12)氧化铝微粒空气喷磨备洞.每组抽取2颗样本,其中1颗牙齿进行酸蚀,2颗样本行扫描电镜对比观察.余牙树脂充填、热循环处理后亚甲基蓝溶液染色.结果:27μm氧化铝微粒空气喷磨与常规车针备洞比较无显著差别(P>0.05).50μm氧化铝颗粒空气喷磨较常规备洞能显著减少乳牙树脂充填的微渗漏(P<0.05).但50μm与27 μm组间无显著差别(P>0.05).扫描电镜观察:与单纯空气喷磨或常规车针备洞者比较,空气喷磨后酸蚀,牙齿表面形态呈规则的蜂窝状.结论:50μm氧化铝颗粒空气喷磨可显著减少乳牙树脂充填的微渗漏.     

Nd:YAG激光增加非龋性硬化牙本质全酸蚀粘接强度的实验研究

目的 通过微拉伸粘接强度实验,探讨激光对全酸蚀粘接剂处理后的非龋性硬化牙本质与复合树脂粘接强度的影响.方法 选择牙本质视觉分级为3级以上的(牙合)面磨损后牙10颗,每颗牙以低速锯垂直于牙本质表面,将硬化牙本质分为面积相等的两部分(约12 mm2),按随机数字表法将这两部分分为实验组和对照组,实验组经Nd∶YAG激光(1 W,10 Hz)处理后,使用Scotchbond (STB)酸蚀、涂布粘接剂Adper Single bond 2(ASB)联合Z350复合树脂充填,对照组使用STB酸蚀、涂布粘接剂ASB联合Z350复合树脂充填.置于37 ℃生理盐水中24 h后,制作微拉伸试件并测试微拉伸粘接强度,体视显微镜下观察断裂模式并分类.采用SPSS13.0软件对微拉伸粘接强度值做t检验.结果 实验组粘接强度[(26.11±1. 62)Mpa]显著高于对照组[(22.27±2.16)Mpa],差异有统计学意义(P=0.006).体视显微镜下可见断裂多发生于牙本质-树脂粘接面.结论 Nd∶YAG激光能够提高硬化牙本质与全酸蚀粘接系统的粘接强度.     

空气喷磨处理氟斑牙牙釉质对树脂粘接强度的影响

目的:检测空气喷磨处理对氟斑牙牙釉质与复合树脂间粘接强度影响.方法:根据Dean氏分类标准,选择15颗完整无龋坏的氟斑牙患者因正畸需要拔除的第一前磨牙为研究对象,随机分为A(单纯酸蚀)、B(单纯喷磨)、C(喷磨加酸蚀)三组进行釉质表面处理后粘接树脂,采用微拉伸粘接强度实验测定三组试件的微拉伸粘接强度.结果:A、B、C三...     

脉冲Nd:YAG激光对非龋性硬化牙本质自酸蚀黏结强度的影响

目的:采用微拉伸黏结强度实验,比较脉冲Nd:YAG激光作用于硬化牙本质对复合树脂-硬化牙本质之间自酸蚀黏结强度的影响。方法:选择10颗硬化牙本质视觉分级均为3级以上的面磨损后牙,将磨损面硬化牙本质分为面积近似相等的两部分(约12mm2),随机分为实验组和对照组。实验组以1W、10Hz脉冲Nd:YAG激光作用于硬化牙本质表面,联合自酸蚀黏结剂Adper Prompt L-Pop处理和Z350复合树脂充填;对照组直接使用自酸蚀黏结剂Adper Prompt L-Pop处理硬化牙本质表面,并用Z350复合树脂充填。24h后制作微拉伸试件,测试微拉伸黏结强度,在体视显微镜下观察断裂模式并分类。采用SPSS13.0软件包对试件微拉伸黏结强度值做配对t检验。结果:实验组和对照组的微拉伸黏结强度分别为(18.94±6.81)MPa和(15.76±5.61)MPa。实验组复合树脂与硬化牙本质黏结强度高于对照组,差别有统计学意义(P0.05)。体视显微镜下观察,断裂多发生在黏结树脂-牙本质界面。结论:脉冲Nd:YAG激光处理硬化牙本质,能够提高复合树脂与硬化牙本质之间的自酸蚀黏结强度。     

不同牙体预备车针所致玷污层对自粘接型树脂水门汀 粘接强度的影响

目的评价不同车针所致牙本质表面玷污层性状对自粘接型树脂水门汀粘接强度的影响。方法将36颗新鲜离体、无龋的人第三恒磨牙暴露出牙本质表面,随机分为两组:A组用标准粒度金刚砂车针(蓝标)进行粗磨;B组用标准粒度+细粒度金刚砂车针(黄标)进行粗磨并进一步细磨抛光。处理后的牙齿分别与3种自粘接型复合树脂水门汀:Clearfil SA Cement(SC)、MultilinkSpeed(MS)、RelyX U200(RX)粘接制成微拉伸试件,试件在水中存储24 h后进行微拉伸强度测试。使用双因素方差分析对牙本质表面处理、树脂水门汀类型进行分析,并判断两者间的交互作用。结果扫描电镜观察到A组牙本质表面粗糙,玷污层较厚,牙本质小管口未完全堵塞;B组牙本质表面粗糙程度降低,牙本质小管口完全堵塞,玷污层变薄。统计结果显示不同牙本质表面处理方法、自粘接树脂水门汀类型均会对粘接强度产生显著影响(P<0.05),但两者之间无显著的交互作用;SC、RX和MS的B组粘接强度均低于A组,牙本质表面使用蓝标车针研磨后,3种树脂水门汀粘接强度之间没有显著差异,经过黄标车针抛光后,MS的粘接强度显著低于SC和RX,但SC和RX之间无显著差异。断裂模式计数显示3种树脂水门汀断裂模式主要为界面断裂。结论牙本质表面玷污层性状及自粘接型树脂水门汀类型都会对粘接强度产生影响。     

空气喷磨机喷磨牙釉质牙本质的抗剪切力比较研究

空气喷磨机（ＫＣＰ１０００）是近年来发展迅速的新型牙体预备系统．本文通过测量抗剪切力，比较ＫＣＰ处理牙釉质、牙本质８ｓ，磷酸酸蚀牙釉质３０ｓ后与复合树脂间抗剪切力．结果表明：３组之间抗剪切力无显著差别．因此我们得出：ＫＣＰ喷磨系统无需酸蚀，仅喷磨８ｓ即可达到磷酸酸蚀牙釉质的粘结强度；ＫＣＰ处理牙本质后能够显著提高表面粘结力，使之达到磷酸酸蚀牙釉质后的效果     

预酸蚀对非龋性硬化牙本质黏结强度的影响

目的：评价预酸蚀处理提高3种自酸蚀黏结剂对牙颈部非龋性硬化牙本质黏结的有效性。方法：选择牙颈部有典型硬化牙本质的离体牙29个，其中24个随机分3组，每组8个牙，分别应用黏结剂Contax、Clearfil TRI—S Bond及Xeno Ⅲ，剩余5个牙用来观察硬化牙本质表面微观结构。以等分硬化牙本质的方式纵向切开每个牙齿，一半先用350g／L磷酸酸蚀15s，然后应用黏结剂，另一半直接应用黏结剂。在黏结剂上充填复合树脂并固化，24h后片切制作微拉伸黏结试件，测试拉伸黏结强度，并在扫描电镜下观察断裂面。结果：Contax与Clearfil TRI—S Bond2种黏结剂的预酸蚀组的黏结强度明显高于未预酸蚀黏结组（P〈0．01），XenoⅢ预酸蚀组与未预酸蚀黏结组拉伸黏结强度无显著性差异（P〉0．05）。结论：用350g／L的磷酸预酸蚀能够提高一些自酸蚀黏结剂对非龋性硬化牙本质的黏结强度。     

空气喷磨处理氟斑牙牙釉质对树脂粘接强度的影响

目的：检测空气喷磨处理对氟斑牙牙釉质与复合树脂间粘接强度影响。方法：根据Dean氏分类标准,选择15颗完整无龋坏的氟斑牙患者因正畸需要拔除的第一前磨牙为研究对象,随机分为A（单纯酸蚀）、B（单纯喷磨）、C（喷磨加酸蚀）三组进行釉质表面处理后粘接树脂,采用微拉伸粘接强度实验测定三组试件的微拉伸粘接强度。结果：A、B、C三组牙釉质粘接树脂后的微拉伸粘接强度分别为（23.48±5.71）MPa、（16.55±3.52）MPa、（29.24±4.61）MPa,各组微拉伸粘接强度平均值间差异有统计学意义（P〈0.01）。结论：采用空气喷磨加酸蚀预处理氟斑牙牙釉质可以提高氟斑牙牙面与复合树脂的粘接力。     

两种预备车针所致牙本质玷污层特点及其对通用型粘接剂粘接强度影响研究

目的 探究2种临床常用预备车针所致玷污层的特点及其对2种常用通用型粘接剂[Single Bond Universal(SBU)、All Bond Universal(ABU)]粘接强度的影响。方法 选取2020年6月至2021年3月于南京医科大学附属口腔医院外科门诊拔除的健康无龋阻生第三磨牙40颗,随机分为金刚砂组（使用金刚砂车针预备）和碳化钨钢组（使用碳化钨钢车针预备）,每组20颗。金刚砂组和碳化钨钢组各取14颗预备后的离体牙随机分为SBU亚组（使用SBU粘接剂并树脂分层固化）和ABU亚组（使用ABU粘接剂并树脂分层固化）,每亚组7颗,行微拉伸强度（粘接强度）测试并使用扫描电镜观察树脂牙本质粘接界面。金刚砂组和碳化钨钢组各取6颗预备后的离体牙随机分为玷污层亚组（不做处理）、SBU粘接亚组（仅SBU粘接剂粘接处理）和ABU粘接亚组（仅ABU粘接剂粘接处理）,每亚组2颗,使用扫描电镜观察牙本质玷污层及粘接剂处理后的牙本质面。结果 双因素方差分析结果显示,车针类型和粘接剂类型对粘接强度均有显著影响（F值分别为33.175、7.219,均P <0.05）,但两因素无显著交互作用（F=0...     

Composite-to-composite microtensile bond strength in the repair of a microfilled hybrid resin: effect of surface treatment and oxygen inhibition

PURPOSE: To compare the 24-h microtensile bond strength of a microfilled hybrid composite to the same material after mechanical and/or chemical treatment and assess the effect of oxygen inhibition on the composite-composite bond. MATERIALS AND METHODS: Forty composite cylinders of Gradia Direct Anterior (GC) were prepared and stored 24 h prior to the following surface treatments: 50-microm aluminum oxide air abrasion and 37% phosphoric acid etching (group 1); hydrochloric acid and 6.9% hydrofluoric acid etching (group 2); diamond bur roughening and 37% phosphoric acid etching (group 3); diamond bur roughening (group 4). In all groups, Prime & Bond NT (Dentsply De Trey) was applied and light cured in air or under a nitrogen atmosphere, prior to layering a buildup of the repairing resin composite. Microtensile bond strength measurements were performed. Data were statistically analyzed with two-way ANOVA and Tukey's test (alpha = 0.05). RESULTS: The curing atmosphere did not significantly influence the interfacial strength (p < 0.05). Surface treatment significantly affected the composite-composite bond (p > 0.05). Air abrasion, regardless of curing atmosphere, resulted in the strongest bond (p < 0.05). The other treatments were comparable. CONCLUSION: Air abrasion and the application of a bonding agent offer satisfactory bond strengths for composite repair. The oxygen inhibition layer on a light-cured adhesive is not crucial to the success of the 24-h composite-composite bond.     

Er:YAG激光处理对牙本质与树脂粘结强度的影响

目的:探讨Er:YAG激光处理对牙本质表面性能及树脂粘结强度的影响。方法:选取30颗无龋坏、无修复体的人离体磨牙,用高速涡轮手机在流水冲洗下磨除釉质层。每个牙冠以髓腔为中心沿近远中向切开成颊/舌两部分,最终选取50个样件,按不同的表面处理方法随机分为5组(A~E组),每组10个样件。每组2个样件扫描电镜观察,其余8个样件分别在处理后的牙本质表面粘结光固化复合树脂,进行剪切强度测试。结果:C组最高,为(7.11±1.73) MPa,E组次之,E组与A、C、D组无统计学差异, B组较低,其中B组与C、D、E组均有统计学差异。扫描电镜观察:酸蚀组可见部分牙本质小管口开放,管径未增大;管周牙本质与管间牙本质界限不明显。激光+酸蚀组可见牙本质表面清沽,牙本质小管开放,周围白晕环绕。激光组可见牙本质表面清洁、粗糙,无玷污层,呈片状、蜂窝状外观,管周牙本质与管间牙本质界限清晰。结论:Er:YAG激光处理能增加牙本质与树脂的剪切粘结强度,但是合适的能量参数有待进一步研究。     

固化光源对牙本质粘结强度的影响

目的：研究两种固化光源对牙本质粘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20颗,随机分成4组。去除殆面釉质,暴露平的牙本质表面,分别使用卤素光固化灯和发光二极管光固化灯固化粘结剂和复合树脂,形成3mm高的树脂冠：A组：卤素光固化灯固化粘结剂20s,卤素光固化灯固化树脂40s;B组：卤素光固化灯固化粘结剂20s,发光二极管光固化灯固化树脂30s;C组：发光二极管光固化灯固化粘结剂20s,发光二极管光固化灯固化树脂30s;D组：发光二极管光固化灯固化粘结剂20S,卤素光固化灯固化树脂40s。所有实验牙置于（37±1）℃的生理盐水中24h后,用硬组织切片机将其切成粘结面积约1．0mm×1．0mm的条形试件,用以测试牙本质微拉伸粘结强度。在扫描电镜下观察样本的断裂界面。结果：固化粘结剂的光源对牙本质微拉伸粘结强度的影响有显著的统计学意义（P〈0．05）。4组中微拉伸粘结强度最大值为（29．55±4．39）MPa,出现在C组。扫描电镜下观察测试样本的断裂多数为粘结界面破坏。结论：固化光源对牙本质粘结的微拉伸强度存在影响,牙本质的粘结强度主要与固化粘结剂的光源有关。本实验显示使用发光二极管光固化灯固化粘结剂20s,发光二极管光固化灯固化树脂30s时牙本质的粘结强度最好。     

Resin bond strength and micromorphology of human teeth prepared with an Erbium:YAG laser

PURPOSE: To evaluate the in vitro effect of the Er:YAG laser and high-speed rotary instrumentation on the bond strength of resin composite to human enamel and dentin, and determine which conditioner, either phosphoric acid or a self-etching primer, resulted in higher bond strengths with either of the surface treatments. METHODS: 48 third molars were used. Dentin and enamel specimens were sectioned and polished with 600-grit SiC paper and treated either with carbide bur or an Erbium:YAG laser and treated with one of three different conditions, acid-etch/bonding agent (Scotchbond Multi-Purpose Plus), no etching and same bonding agent, and an experimental self-etching primer (EXL 547). After storage for 48 hours at 37 degrees C and 100% humidity, specimens were prepared in an hourglass shape for microtensile bond test (ca. 1 mm2) and debonded in tension. Areas were measured and bond strengths were calculated for each specimen. Failure modes, micromorphology of surface treatments and bonding interfaces of representative specimens from acid-etched and self-etched groups were analyzed with scanning electron microscopy. Means were compared using three-way analysis of variance, and Scheffé post-hoc test (P < 0.05) was used to determine differences among surface treatments, tooth substrate and conditioners. RESULTS: Dentin prepared with the carbide bur and treated with phosphoric acid followed by the application of Scotchbond Multi-Purpose had the highest bond strengths (35.7 MPa). Enamel and dentin prepared with the Er:YAG laser had the highest bond strengths when the surfaces were acid-etched followed by Scotchbond Multi-Purpose (25.8-21.1 MPa). Carbide bur exhibited higher bond strengths than laser with the use of the experimental self-etching primer but laser showed higher bond strengths than the bur with the use of Scotchbond Multi-Purpose and no etching. The predominant failure mode of most of the treatment conditions was partially adhesive between the bonding resin and enamel or dentin, and partially cohesive within the bonding resin. SEM analysis revealed the absence of a smear layer on laser-treated teeth when compared to untreated control and bur-cut teeth.     

Influence of air abrasion and long-term storage on the bond strength of self-etching adhesives to dentin

This study tested the effects of long-term storage and aluminum oxide air abrasion on the bond strength of self-etching adhesive systems. Extracted human third molars were ground flat with 600-grit SiC paper to expose middle coronal dentin. Clearfil SE Bond and One-Up Bond F were applied to dentin surfaces in accordance with manufacturers instructions with or without previous aluminum oxide 50 microm air abrasion. A crown was built up with the resin composite TPH Spectrum and the specimens were stored in water for 24 hours. The bonded assemblies were vertically sectioned into beams for microtensile bond testing. The beams of each tooth were individually immersed in bottles containing water at 37 degrees C for one day, three and six months; the water was changed daily. The specimens were then subjected to microtensile bond testing. The bond strength data were subjected to ANOVA and Tukey Kramer test. Fractured specimens were analyzed in a scanning electron microscope to determine failure modes. Air abrasion improved Clearfil SE Bond bond strength in the three month evaluation. No significant difference was found between the two adhesives systems, but bond strengths gradually decreased over time. Failure modes varied significantly among groups and were influenced by long-term storage and aluminum oxide air abrasion.     

三种树脂粘接剂对可切削复合树脂与牙本质粘接强度的比较研究

目的 通过比较3种树脂粘接剂对聚甲基丙烯酸甲酯-纳米二氧化硅-二氧化锆(polymethylmecrylate/nano SiO2-ZrO2,PNSZ)可切削复合树脂与牙本质的粘接强度的差异,寻找适合PNSZ可切削复合树脂的树脂粘接剂,为临床应用提供参考.方法 使用树脂粘接剂A(RelyX ARC)、B(Panavia-F)和c(Variolink II)粘接PNSZ可切削复合树脂与牙本质,测试剪切粘接强度和微拉伸粘接强度(各分为A、B、C 3组,每组10个试件),并采用50倍立体显微镜观察断裂模式.结果 剪切测试中A、B、C组试件的粘接强度分别为(14.07±4.67)、(13.17±4.63)、(12.10±2.18)MPa,差异无统计学意义(P＞0.05);微拉伸测试中A、B、C组试件的粘接强度分别为(11.49±4.90)、(9.66±4.15)、(10.11±4.20)MPa,差异无统计学意义(P＞0.05).立体显微镜观察显示,3种粘接剂的断裂模式均以牙本质-粘接剂界面的断裂为主.结论 3种树脂粘接剂对PNSZ可切削复合树脂与牙本质的粘接效果相近.PNSZ可切削复合树脂一粘接剂界面的粘接优于牙本质-粘接剂界面.     

ErCr:YSGG激光对牙本质界面粘结强度及形态结构的影响

目的：研究ErCr:YSGG激光在不同粘结机理作用下对牙本质黏结剂黏结强度和微观形态的影响。方法：20颗完整无龋的人第三磨牙,去除咬合面釉质,随机分为4组 (n=5)：第1组：激光预备+全酸蚀粘结剂;第2组：常规预备+全酸蚀粘结剂;第3组：激光预备+自酸蚀粘结剂;第4组：常规预备+自酸蚀粘结剂。复合树脂粘结至牙面制成1.0mm*1.0mm*10mm长方体试样,微拉伸测试黏结强度并进行统计学分析。体视显微镜下观察断裂类型,每组随机选取2个断裂前样本及粘结前样本行扫描电镜观察。另4颗分为2组（n=2）分别做激光预备和常规预备后电镜观察粘结前界面。 结果：黏结强度第4组最低（12.37±3.12Mpa）,与其它3组有统计学差异（P<0.01）,其他3组间无统计学差异（P>0.05）;断裂类型多为黏结剂断裂的混合破坏,各组断裂类型间无统计学差异(P>0.05);扫描电镜观察第1-3组混合层薄而致密,树脂突长而粗,第4组混合层不均一,树脂突短而细。水激光预备样本的牙本质小管开放,牙本质表面清洁、无热损伤痕迹。常规预备样本的牙本质小管封闭,表面玷污层较厚。 结论：ErCr:YSGG激光可显著提高自酸蚀粘结剂的粘结强度。     

Microtensile bond strength of self-etching adhesive systems to differently prepared dentin

PURPOSE: To evaluate the microtensile bond strength (microTBS) of three self-etching adhesive systems with different degrees of acidity (Clearfil SE Bond, One-Up Bond F, and Xeno III) to dentin prepared with three different methods. METHODS: Forty-five extracted human third molars were ground flat to expose occlusal dentin and polished with 600-grit abrasive paper. All teeth were randomly divided into three groups according to the preparation method: baseline surface (AP#600), steel fissure bur (SB) and regular grit diamond bur (DB). Dentin surfaces were bonded with one of the three adhesive systems; then resin composite was incrementally built up. After storage in 37 degrees C water for 24 hours, specimens were cut and trimmed to create an hourglass shape with cross sectional area of approximate 1 mm2. All specimens were subjected to microtensile bond strength testing. The bond strength data were analyzed with one and two-way ANOVA and Dunnett Multiple comparisons test at P< 0.05. RESULTS: For Xeno III and One-Up Bond F, the microTBS to dentin prepared with the different methods were not significantly different. However, the microTBS of Clearfil SE Bond to dentin prepared with the diamond bur was significantly lower than the other preparation methods. Xeno III produced the lowest microTBS that were statistically different from the other adhesive systems when each preparation method was compared (P< 0.01). SEM observation of the prepared dentin surfaces showed that the diamond bur group produced a thicker smear layer that followed by steel bur and 600-grit paper. Therefore, the smear layer from diamond burs had a greater influence in decreasing microTBS of Clearfil SE Bond that has the weakest acidity self-etching adhesive systems evaluated.